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ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES (contact cables H01B 7/10; overvoltage protection resistors, resistive arresters H01C 7/12, H01C 8/04; electrolytic self-interrupters H01G 9/18; switching devices of the waveguide type H01P; devices for interrupted current collection H01R 39/00; overvoltage arresters using spark gaps H01T 4/00; emergency protective circuit arrangements H02H; switching by electronic means without contact-making H03K 17/00)
Definition statement
This subclass/group covers:

Electric switches, i.e. single points of mechanically operable electrical connection (or interruption). Types, details and manufacture thereof, as detailed below .

Relays, i.e. switching devices having contacts which are operated from electric inputs which supply, directly or indirectly, all the mechanical energy necessary to cause both the closure and the opening of the contacts. Types, details and manufacture thereof. Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current.

Selectors, i.e. arrays of electric switches which selectively connect some inputs out of a plurality of inputs to some outputs out of a plurality of outputs. Types, details, and manufacture thereof in groups H01H 63/00, H01H 65/00 and H01H 67/00.

Protective devices like: circuit-breaking switches, protective switches, fuses, evaporation devices, details and manufacture thereof. This subclass also covers (in groups H01H 69/00 - H01H 87/00) devices for the protection of electric lines or electric machines or apparatus in the event of undesired change from normal electric working conditions, the electrical condition serving directly as the input to the device.

Mechanical structural details of control members of switches or of keyboards such as keys, push-buttons, levers or other mechanisms for transferring the force to the activated elements, even when they are used for controlling electronic switches.

Circuit arrangements not adapted to a particular application of the switch and not otherwise provided for, e.g. for ensuring operation of the switch at a predetermined point in the ac cycle.

Relationship between large subject matter areas

Circuit arrangements for the automatic protection of electric lines or electric machines or apparatus in the event of an undesired change from normal working conditions: H02H

References relevant to classification in this subclass
This subclass/group does not cover:
Electronic switching or gating, i.e. not by contact-making or -braking
Contact cables
Electrolytic self-interrupters
Bases, casings, or covers accommodating two or more switching devices or for accommodating a switching device as well as another electric component, e.g. bus-bar, line connector
Casings for electrical apparatus in general
Mechanical details directly producing electronic effects
Switches combined with plug-and-socket connectors
Controlling members for hand actuation by rotary movement, e.g. hand wheels
Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuit-breaker in the network
Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection

Examples of places where the subject matter of this subclass/group is covered when specially adapted, used for a particular purpose, or incorporated in a larger system:

Switching arrangements for the supply or distribution of electric power
Mounting switch and fuse separately on, or in, common support
Frameworks for mounting two or more relays or for mounting a relay and another electrical component
Arrangements of switchgear in which switches are enclosed in, or structurally associated with, a casing; Gas-insulated switchgear
Switches for telephonic communication
Keyboards for special applications, see the relevant subclasses or groups, e.g.
Manually-actuated control mechanisms provided with one single controlling member co-operating with two or more controlled members, the controlling member being movable by hand about orthogonal axes, e.g. joysticks
Lever attached to steering wheel for controlling the lights of a car, e.g. steering column stalk switches
Switches mounted on the steering wheel
Informative references
Attention is drawn to the following places, which may be of interest for search:
Overvoltage protection resistors, resistive arresters
Switching devices of the waveguide type
Electric connections in general
Devices for interrupted current collection; Rotary current collectors, distributors, or interrupters
Overvoltage arresters using spark gaps
Arcing horns per se
Arrangements for locating electric faults; Testing of relays
Clocks with attached or built-in means operating any device at preselected times or after preselected time intervals
Processes or apparatus specially adapted for the manufacture or treatment of micro-structural devices or systems, e.g. in combination with electrical devices
Micro-mechanical devices, comprising flexible or deformable elements
Sensing elements for providing continuous conversion of a variable into mechanical displacement
G01
Measuring distances, levels or bearings
Measuring liquid level
Temperature-responsive elements in general
Measuring electric values
Magnets in general
Electromagnets; Actuators including electromagnets
Cores, Yokes, or armatures in general
Magnetic coils or windings in general
Circuit arrangements for obtaining desired operating characteristics
Variable transformers or inductances having provision for tap-changing without interrupting the load current
Disposition or arrangement of fuses on boards
Input arrangements for converting discrete items of information into a coded form; Programmable keyboards
Installations of electric cables or lines in or on buildings, equivalent structures or vehicles
Distribution boxes; Connection or junction boxes
Constructional features of telephone sets; Construction or mounting of dials or of equivalent devices
Capacitors in which the capacitance is varied by using variation of distance between electrodes
Selecting apparatus or arrangements in general
Special rules of classification within this subclass

The use of the Indexing Code scheme H01H 1/00 - H01H 89/10 is mandatory to classify additional (non-invention) information.

The use of the deep indexing scheme H01H 2201/00 - H01H 2239/078 is mandatory whenever appropriate.

The following IPC groups are not used in the internal ECLA classification scheme. Subject matter covered by these groups is classified in the following ECLA groups:

H01H33/575 covered by H01H 33/56

H01H33/825 covered by H01H 33/82

H01H33/835 covered by H01H 33/83

H01H33/867 covered by H01H 33/86

H01H33/873 covered by H01H 33/86

H01H33/915 covered by H01H 33/91

H01H33/985 covered by H01H 33/98

H01H33/99 covered by H01H 33/98

Further information:

  • Details only described with reference to, or clearly only applicable to, switching devices of a single basic type, are classified in the group appropriate to switching devices of that basic type, e.g. H01H 19/02 or H01H 75/04.

Details of an unspecified type of switching device, or disclosed as applicable to two or more kinds of switching devices designated by the terms or expressions "switches", "relays", "selector switches", and "emergency protective devices", are classified in groups H01H 1/00 - H01H 9/00.

Details of an unspecified type of switch, or disclosed as applicable to two or more types of switches as defined by groups H01H 13/00 - H01H 43/00 and subgroups H01H 35/02, H01H 35/06, H01H 35/14, H01H 35/18, H01H 35/24 and H01H 35/42, all hereinafter called basic types, are classified in groups H01H 1/00 - H01H 9/00.

Apparatus or processes specially adapted for manufacturing of electric switches of an unspecified type are classified in group H01H 11/00.

Details of contact arrangements or operating mechanisms for tap changer devices are classified in the subgroup H01H 9/0005.

  • Mechanical structural details of control members specially adapted for rectilinearly movable switches such as keys or push-buttons having a plurality of operating members associated with different sets of contacts, e.g. keyboards, are classified in the subgroup H01H 13/70.

Processes specially adapted for manufacturing of rectilinearly movable switches such as keys or push-buttons having a plurality of operating members associated with different sets of contacts, e.g. keyboards, are classified in the subgroup H01H 13/88.

Earthing or grounding switching devices are classified in the subgroup H01H 31/003.

Vacuum switches are classified in the subgroup H01H 33/66. Combinations of vacuum switches with other type of switch, e.g. for load break switches are classified in the subgroup H01H 33/6661.

  • Switches actuated by change of magnetic field or of electric field are classified in the group H01H 36/00.
  • Thermally-actuated switches are classified in the group H01H 37/00.

Details of an unspecified type of relay, or disclosed as applicable to two or more types of relays as defined by groups H01H 51/00 - H01H 61/00, hereinafter called basic types, are classified in group H01H 45/00. Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current, are classified in group H01H 47/00.

Apparatus or processes specially adapted for manufacturing of relays are classified in group H01H 49/00.

  • Details of an unspecified protective switch or protective relay, or applicable to two or more types of protective devices as defined by groups H01H 73/00 - H01H 83/00, hereinafter called basic types, are classified in group H01H 71/00.

Apparatus or processes specially adapted for manufacturing of protective devices are classified in group H01H 69/00.

Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive are classified in group H01H 85/00.

  • The subgroup H01H 9/54 covers circuit arrangements not adapted to a particular application of an unspecified type of switching device and for which no provision exists elsewhere, e.g. combinations of mechanical switches and static switches or for ensuring operation of the switch at a predetermined point in the ac cycle, and is residual with respect to the groups H01H 1/00 - H01H 9/00 and H01H 69/00 - H01H 87/00.
  • The subgroup H01H 33/59 covers circuit arrangements not adapted to a particular application of a high-tension or heavy-current switch and not otherwise provided for, e.g. for ensuring operation of the switch at a predetermined point in the ac cycle, and is residual with respect to the groups H01H 31/00 - H01H 33/00.
  • Details only described with reference to, or clearly only applicable to, rectilinearly movable switches having operating members associated with different sets of contacts, e.g. keyboards, are classified in the deep indexing scheme for multilayer keyboard switches H01H 2201/00 - H01H 2239/078.
  • Details of an unspecified type of switching device, or disclosed as applicable to several kinds of switching devices or relating to the application field of the switching device are classified in a separate orthogonal indexing scheme (pending).
Glossary of terms
In this subclass/group, the following terms (or expressions) are used with the meaning indicated:
Acting, actuating or action
self-induced, e.g. not manually caused, movement of parts at one stage of the switching. Apply to all parts of the verbs "to operate"; "to actuate", and "to act", and to words derived therefrom, e.g. to "actuation" or "actuating"
Contacts
necessary elementary components of a switch that ensure the electrical connection, each switch comprising at least two contacts, and possibly more than two
Driving mechanism
means by which an operating force applied to the switch is transmitted to the moving contact or contacts
Key
push button
Operating
broader sense than "actuating", including the manually caused movement of parts at one stage of the switching.
Push button
knob or button that allows the manual operation of a switch in order to e.g. close an electric circuit
Relay
switching device having contacts which are operated from electric inputs which supply, directly or indirectly, all the mechanical energy necessary to cause both the closure and the opening of the contacts
Selector
array of electric switches which selectively connect some inputs out of a plurality of inputs to some outputs out of a plurality of outputs
Switch
single point of mechanically operable electrical connection (or interruption)
Switch site
physical location where the contacts can touch each other
Contacts (liquid contacts H01H 29/04)
References relevant to classification in this group
This subclass/group does not cover:
Liquid contacts
Special rules of classification within this group

Subject matter classifiable in more than one of the groups H01H 1/023 to H01H 1/029 should be classified in all relevant groups.

Composite materials
Glossary of terms
In this subclass/group, the following terms (or expressions) are used with the meaning indicated:
Composite material
a material made of two or more different materials, e.g. coated material, layered materials or carbon fibres in a copper base or matrix
Bridging contacts [N: (for circuit breakers H01H 73/045)]
References relevant to classification in this group
This subclass/group does not cover:
Bridging contacts for circuit breakers
by sliding (by rolling or wrapping H01H 1/16)
Informative references
Attention is drawn to the following places, which may be of interest for search:
Rolling or wrapping
by magnetic force [N: (combined with electrodynamic opening H01H 77/101)]
References relevant to classification in this group
This subclass/group does not cover:
Magnetic force combined with electrodynamic opening
Contact arrangements for providing make-before-break operation, e.g. for on-load tap changing [N: (for tap changers H01H 9/0016)]
Informative references
Attention is drawn to the following places, which may be of interest for search:
Contact arrangements for tap changers
Electric connections to or between contacts; Terminals ([N: for high tension switches H01H 33/025; for electromagnetic relays H01H 50/14; for circuit breakers H01H 71/08]; electric connections in general H01R)
References relevant to classification in this group
This subclass/group does not cover:
Terminals for high tension switches
Terminals for electromagnetic relays
Terminals for circuit breakers
Informative references
Attention is drawn to the following places, which may be of interest for search:
Electric connections in general
Auxiliary means structurally associated with the switch for cleaning or lubricating contact-making surfaces (cleaning by normal sliding of contacts H01H 1/18, H01H 1/36)
Informative references
Attention is drawn to the following places, which may be of interest for search:
Cleaning by normal sliding of contacts
Protective enclosures, baffle plates, or screens for contacts (for arc-extinguishing H01H 9/30; for mercury contacts H01H 29/04)
References relevant to classification in this group
This subclass/group does not cover:
Protective enclosures, baffle plates, or screens for arc-extinguishing
Protective enclosures, baffle plates, or screens for mercury contacts
Mechanisms for operating contacts (snap-action arrangements H01H 5/00; devices for introducing a predetermined time delay H01H 7/00; [N: for tap changers H01H 9/0027]; thermal actuating or release means H01H 37/02)
References relevant to classification in this group
This subclass/group does not cover:
Snap-action arrangements
Informative references
Attention is drawn to the following places, which may be of interest for search:
Devices for introducing a predetermined time delay
Devices for tap changers
Thermal actuating or release means
using pneumatic or hydraulic actuator [N: (for storing energy in a spring motor H01H 3/301)]
Informative references
Attention is drawn to the following places, which may be of interest for search:
Storing energy in a spring motor
using dynamo-electric motor (for storing energy in a spring motor H01H 3/30)
Informative references
Attention is drawn to the following places, which may be of interest for search:
Storing energy in a spring motor
using electromagnet (for storing energy in a spring motor H01H 3/30; for operating relays H01H 45/00)
Informative references
Attention is drawn to the following places, which may be of interest for search:
Storing energy in a spring motor
Operating relays
Driving mechanisms, i.e. for transmitting driving force to the contacts (snap-action arrangements H01H 5/00; introducing a predetermined time delay H01H 7/00)
References relevant to classification in this group
This subclass/group does not cover:
Snap-action arrangements
Introducing a predetermined time delay
Lubricating means structurally associated with the switch (for lubricating contact-making surfaces H01H 1/60)
References relevant to classification in this group
This subclass/group does not cover:
Lubricating contact-making surfaces
Snap-action arrangements, i.e. in which during a single opening operation or a single closing operation energy is first stored and then released to produce or assist the contact movement
Energy stored by deformation of elastic members (by deformation of bimetallic elements in thermally-actuated switches H01H 37/54)
Informative references
Attention is drawn to the following places, which may be of interest for search:
Energy stored by deformation of bimetallic elements in thermally-actuated switches
Devices for introducing a predetermined time delay between the initiation of the switching operation and the opening or closing of the contacts (time or time-programme switches H01H 43/00)
Informative references
Attention is drawn to the following places, which may be of interest for search:
Time or time-programme switches
with thermal timing means (thermally actuated switches H01H 37/00)
Informative references
Attention is drawn to the following places, which may be of interest for search:
Thermally actuated switches
Devices for ensuring operation of the switch at a predetermined point in the AC cycle (circuit arrangements H01H 9/56)
Informative references
Attention is drawn to the following places, which may be of interest for search:
Circuit arrangements
Details of switching devices, not covered by groups H01H 1/00 to H01H 7/00 (casings for switchgear H02B 1/26; casings for electrical apparatus in general H05K 5/00)
References relevant to classification in this group
This subclass/group does not cover:
Casings for switchgear
Informative references
Attention is drawn to the following places, which may be of interest for search:
Casings for electrical apparatus in general
Bases, casings, or covers (accommodating more than one switch or a switch and another electrical component H02B 1/26)
References relevant to classification in this group
This subclass/group does not cover:
Accommodating more than one switch or a switch and another electrical component
Adaptation for built-in fuses (mounting switch and fuse separately on, or in, common support H02B)
Informative references
Attention is drawn to the following places, which may be of interest for search:
Mounting switch and fuse separately on, or in, common support
Interlocking, locking, or latching mechanisms (contacts adapted to act as latches H01H 1/52; by an auxiliary movement of the operating partor of an attachment thereto H01H 3/20; [N: for withdrawable switchgear H02B 11/00])
Informative references
Attention is drawn to the following places, which may be of interest for search:
Contacts adapted to act as latches
Auxiliary movement of the operating partor of an attachment thereto
Withdrawable switchgear
for interlocing between casing, cover, or protective shutter and mechanism for operating contacts [N: (explosion-proof cases H01H 9/045; built-in fuses and interlocking mechanisms H01H 9/104; by automatic release of circuit breakers H01H 71/126)]
Informative references
Attention is drawn to the following places, which may be of interest for search:
Explosion-proof cases
Built-in fuses and interlocking mechanisms
By automatic release of circuit breakers
for interlocking two or more switches ([N: H01H 13/568 takes precedence]; by a detachable member H01H 9/28; [N: for electromagnetic relays H01H 50/323])
References relevant to classification in this group
This subclass/group does not cover:
Contacts also returning by some external action, e.g. interlocking, protection, remote control
Informative references
Attention is drawn to the following places, which may be of interest for search:
Detachable member
Electromagnetic relays
for locking switch parts by a key or equivalent removable member (switches operated by a key H01H 27/00; locking by removable part of two-part coupling device H01R)
Informative references
Attention is drawn to the following places, which may be of interest for search:
Switches operated by a key
Locking by removable part of two-part coupling device
Auxiliary contacts on to which the arc is transferred from the main contacts (using arcing-horns H01H 9/46)
Informative references
Attention is drawn to the following places, which may be of interest for search:
Arcing-horns
Multiple main contacts for the purpose of dividing the current through, or potential drop along, the arc [N: (multiple parallel contact bars H01H 1/226)]
References relevant to classification in this group
This subclass/group does not cover:
Multiple parallel contact bars
using arcing-horn (using blow-out magnet H01H 9/44; arcing-horns per se H01T 4/14)
Informative references
Attention is drawn to the following places, which may be of interest for search:
Blow-out magnet
Arcing-horns per se
Cooling of switch parts (cooling of contacts H01H 1/62)
Informative references
Attention is drawn to the following places, which may be of interest for search:
Cooling of contacts
Apparatus or processes specially adapted for manufacture of electric switches (processes specially adapted for manufacture of rectilinearly movable switches having a plurality of operating members associated with different sets of contacts, e.g. keyboards, H01H 13/88; processes or apparatus specially adapted for the manufacture or treatment of micro-structural devices or systems, e.g. in combination with electrical devices, B81C)
Informative references
Attention is drawn to the following places, which may be of interest for search:
Processes specially adapted for manufacture of rectilinearly movable switches having a plurality of operating members associated with different sets of contacts, e.g. keyboards
Processes or apparatus specially adapted for the manufacture or treatment of micro-structural devices or systems, e.g. in combination with electrical devices
Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch (wherein the operating part is flexible H01H 17/00)
References relevant to classification in this group
This subclass/group does not cover:
Switches wherein the operating part is flexible
Details (specially adapted for rectilinearly movable switches having operating members associated with different sets of contacts, e.g. keyboards, H01H 13/70)
References relevant to classification in this group
This subclass/group does not cover:
Specially adapted for rectilinearly movable switches having operating members associated with different sets of contacts, e.g. keyboards
acting with snap action (depending upon deformation of elastic member H01H 13/26)
References relevant to classification in this group
This subclass/group does not cover:
Snap action depending upon deformation of elastic member
the contact returning to its original state upon manual release of a latch (latch released by second push-button H01H 13/68)
Informative references
Attention is drawn to the following places, which may be of interest for search:
Latch released by second push-button
having two operating members, one for opening and one for closing the same set of contacts (single operating member protruding from different sides of switch casing for alternate pushing upon opposite ends H01H 15/22)
Informative references
Attention is drawn to the following places, which may be of interest for search:
Single operating member protruding from different sides of switch casing for alternate pushing upon opposite ends
having a plurality of operating members associated with different sets of contacts, e.g. keyboard ([N: keyboards specially adapted for specific applications, see the relevant subclasses or groups, e.g. B41J, G06F 3/023, H04L 17/00, H04M 1/00; multiple switches specially adapted for electromechanical clocks or watches G04C 3/005]; mounting together a plurality of independent switches H02B)
Informative references
Attention is drawn to the following places, which may be of interest for search:
Keyboards specially adapted for specific applications, see the relevant subclasses or groups
Multiple switches specially adapted for electromechanical clocks or watches
Mounting together a plurality of independent switches
characterised by the layers, e.g. by their material or structure (H01H 13/703 takes precedence)
References relevant to classification in this group
This subclass/group does not cover:
Spacers between contact carrying layers
characterised by ergonomic functions, e.g. for miniature keyboards; characterised by operational sensory functions, e.g. sound feedback (legends H01H 13/83)
Informative references
Attention is drawn to the following places, which may be of interest for search:
Legends
Switches having rectilinearly-movable operating part or parts adapted for actuation in opposite directions, e.g. slide switch
Switches having flexible operating part adapted only for pulling, e.g. cord, chain [N: (for emergency stop switches H01H 3/0226)]
Informative references
Attention is drawn to the following places, which may be of interest for search:
Flexible operating part adapted for emergency stop switches
Stationary parts (guides H01H 17/14)
Informative references
Attention is drawn to the following places, which may be of interest for search:
Movable parts (guides H01H 17/14)
Informative references
Attention is drawn to the following places, which may be of interest for search:
Switches operated by an operating part which is rotatable about a longitudinal axis thereof and which is acted upon directly by a solid external to the switch, e.g. by a hand (rotary current collectors, distributors or interrupters H01R 39/00)
References relevant to classification in this group
This subclass/group does not cover:
Rotary current collectors, distributors or interrupters
Contacts actuated by axial cams (H01H 19/6355 takes precedence)
References relevant to classification in this group
This subclass/group does not cover:
Axial cam devices for transforming the angular movement into linear movement along the axis of rotation
Switches operated by an operating part in the form of a pivotable member acted upon directly by a solid body, e.g. by a hand (tumbler or rocker switches H01H 23/00; switches having an operating part movable angularly in more than one plane H01H 25/04)
References relevant to classification in this group
This subclass/group does not cover:
Tumbler or rocker switches
Switches having an operating part movable angularly in more than one plane
Tumbler or rocker switches, i.e. switches characterised by being operated by rocking an operating member in the form of a rocker button
Glossary of terms
In this subclass/group, the following terms (or expressions) are used with the meaning indicated:
Rocking
as pivotal motion in one plane about an axis parallel to the switch faceplate and located substantially centrally between the ends of the rocker button
Switches with compound movement of handle or other operating part
Switches operated by a removable member, e.g. key, plug, plate; Switches operated by setting members according to a single predetermined combination out of several possible settings (locking switch parts to prevent operation H01H 9/28; combined with plug-and-socket connectors H01R; with current-carrying plug H01R 31/08)
References relevant to classification in this group
This subclass/group does not cover:
Locking switch parts to prevent operation
Informative references
Attention is drawn to the following places, which may be of interest for search:
Switches combined with plug-and-socket connectors
Switches with current-carrying plug
Switches having at least one liquid contact (solid contacts wetted or soaked with mercury H01H 1/08)
Informative references
Attention is drawn to the following places, which may be of interest for search:
Solid contacts wetted or soaked with mercury
operated by tilting contact-liquid container (centrifugal mercury switches H01H 29/26)
References relevant to classification in this group
This subclass/group does not cover:
Centrifugal mercury switches
with contact made by a liquid jet, e.g. earthing switch with contact made by jet of water (operated by direct electrodynamic action H01H 53/00)
References relevant to classification in this group
This subclass/group does not cover:
Switches operated by direct electrodynamic action
Air-break switches for high tension without arc-extinguishing or arc-preventing means (in combination with high tension or heavy-current switches with arc-extinguishing or arc-preventing means H01H 33/00; switching arrangements for the supply or distribution of electric power H02B)
References relevant to classification in this group
This subclass/group does not cover:
Air-break switches in combination with high tension or heavy-current switches with arc-extinguishing or arc-preventing means
Informative references
Attention is drawn to the following places, which may be of interest for search:
Switching arrangements for the supply or distribution of electric power
Interlocking mechanisms (for interlocking with high-tension or heavy-current switches having arc-extinguishing or arc-preventing means H01H 33/52)
References relevant to classification in this group
This subclass/group does not cover:
Interlocking with high-tension or heavy-current switches having arc-extinguishing or arc-preventing means
for interlocking two or more switches (for interlocking with high-tension or heavy-current switches having arc-extinguishing or arc-preventing means H01H 33/52)
References relevant to classification in this group
This subclass/group does not cover:
Interlocking with high-tension or heavy-current switches having arc-extinguishing or arc-preventing means
High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
Means for extinguishing or preventing arc between current-carrying parts (for switches in general H01H 9/30)
Informative references
Attention is drawn to the following places, which may be of interest for search:
Means for extinguishing or preventing arc between current-carrying parts for switches in general
Auxiliary contacts on to which the arc is transferred from the main contacts (using arcing horns H01H 33/20)
Informative references
Attention is drawn to the following places, which may be of interest for search:
Auxiliary contacts using arcing horns
using blow-out magnet [N: (for vacuum switches H01H 33/664; pressure-generated arcs rotated by a magnetic field H01H 33/982)]
References relevant to classification in this group
This subclass/group does not cover:
Vacuum switches
Pressure-generated arcs rotated by a magnetic field
using arcing horns (using blow-out magnet H01H 33/18; arcing horns per se H01T 4/14)
Informative references
Attention is drawn to the following places, which may be of interest for search:
Using blow-out magnet
Arcing horns per se
using dynamo-electric motor (for storing energy in a spring motor H01H 33/40)
Informative references
Attention is drawn to the following places, which may be of interest for search:
Storing energy in a spring motor
using electromagnet (for storing energy in a spring motor H01H 33/40)
Informative references
Attention is drawn to the following places, which may be of interest for search:
Storing energy in a spring motor
Devices for ensuring operation of the switch at a predetermined point in the ac cycle (circuit arrangements H01H 33/59)
Informative references
Attention is drawn to the following places, which may be of interest for search:
Circuit arrangements
Cases (for switchgear H02B 1/26); Reservoirs, tanks, piping or valves, for arc-extinguishing fluid; Accessories therefor, e.g. safety arrangements, pressure relief devices
Informative references
Attention is drawn to the following places, which may be of interest for search:
Cases for switchgear
Oil reservoirs or tanks; Lowering means therefor (associated with withdrawal mechanism for isolation of switch H02B 11/08)
Informative references
Attention is drawn to the following places, which may be of interest for search:
Lowering associated with withdrawal mechanism for isolation of switch
wherein the break is in gas (in air at atmospheric pressure H01H 33/62; vacuum switches H01H 33/66)
References relevant to classification in this group
This subclass/group does not cover:
Breaks in air at atmospheric pressure
Informative references
Attention is drawn to the following places, which may be of interest for search:
Vacuum switches
wherein the break is in gas (in air at atmospheric pressure H01H 33/73)
References relevant to classification in this group
This subclass/group does not cover:
Breaks in air at atmospheric pressure
wherein the break is in gas (in air at atmospheric pressure H01H 33/77)
References relevant to classification in this group
This subclass/group does not cover:
Breaks in air at atmospheric pressure
this movement being effected solely due to the pressure caused by the arc itself or by an auxiliary arc [N: (H01H 33/903 takes precedence)]
References relevant to classification in this group
This subclass/group does not cover:
The movement being effected by or in conjunction with the contact-operating mechanism making use of the energy of the arc or an auxiliary arc and assisting the operating mechanism
the flow of arc-extinguishing fluid being initiated by an auxiliary arc or a section of the arc, without any moving parts for producing or increasing the flow [N: (H01H 33/901 takes precedence)]
References relevant to classification in this group
This subclass/group does not cover:
The movement being effected by or in conjunction with the contact-operating mechanism making use of the energy of the arc or an auxiliary arc
Switches operated by change of a physical condition (operated by change of magnetic or electric field H01H 36/00; thermally-actuated switches H01H 37/00; time switches H01H 43/00; relays H01H 45/00 to H01H 61/00; sensing elements for providing continuous conversion of a variable into mechanical displacement G01)
References relevant to classification in this group
This subclass/group does not cover:
Operated by change of magnetic or electric field
Thermally-actuated switches
Time switches
Relays
Informative references
Attention is drawn to the following places, which may be of interest for search:
Sensing elements for providing continuous conversion of a variable into mechanical displacement
G01
Special rules of classification within this group

A switching device is classified according to that physical condition which, when changed, acts as input to the device, e.g. external explosion causing pressure wave to act upon switch is classified in group H01H 35/24, an explosion produced within the switch in group H01H 37/00 if initiated by heat, in group H01H 39/00 if initiated electrically, and in group H01H 35/14 if initiated by an external blow.

Switches operated by change of speed (operated by change of fluid flow H01H 35/24)
Informative references
Attention is drawn to the following places, which may be of interest for search:
Switches operated by change of fluid flow
Centrifugal switches (level of mercury displaced by centrifugal action H01H 29/26)
Informative references
Attention is drawn to the following places, which may be of interest for search:
Level of mercury displaced by centrifugal action
Switches operated by change of acceleration, e.g. by shock or vibration, inertia switch [N: (wherein the liquid constitutes a contact of the switch H01H 29/002)]
References relevant to classification in this group
This subclass/group does not cover:
Switches operated by change of acceleration, wherein the liquid constitutes a contact of the switch
Switches operated by change of liquid level or of liquid density, e.g. float switch (wherein the liquid constitutes a contact of the switch H01H 29/00; by magnet carried on a float H01H 36/02)
References relevant to classification in this group
This subclass/group does not cover:
Switches operated by change of acceleration, wherein the liquid constitutes a contact of the switch
Informative references
Attention is drawn to the following places, which may be of interest for search:
Switches operated by magnet carried on a float
Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow (wherein the change of pressure is caused by change of temperature H01H 37/36)
References relevant to classification in this group
This subclass/group does not cover:
Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow wherein the change of pressure is caused by change of temperature
Switches actuated by change of magnetic field or of electric field, e.g. by change of relative position of magnet and switch, by shielding [N: (specially adapted for electromechanical clocks or watches G04C 3/004)]
Informative references
Attention is drawn to the following places, which may be of interest for search:
Switches specially adapted for electromechanical clocks or watches
Thermally-actuated switches (electrothermal relays operated by electrical input H01H 61/00; protective switches with electrothermal release or actuation H01H 73/00 to H01H 83/00
References relevant to classification in this group
This subclass/group does not cover:
Electrothermal relays operated by electrical input
Protective switches with electrothermal release or actuation
Bases; Housings; Mountings [N: H01H 37/5427 takes precedence]
References relevant to classification in this group
This subclass/group does not cover:
Encapsulated in sealed miniaturised housing
Thermally-sensitive members (temperature responsive elements in general G01K)
Informative references
Attention is drawn to the following places, which may be of interest for search:
Temperature responsive elements in general
actuated due to expansion or contraction of a fluid with or without vaporisation (the fluid forming a contact of the switch H01H 29/04, H01H 29/30)
References relevant to classification in this group
This subclass/group does not cover:
Fluid forming a contact of the switch
actuated due to expansion or contraction of a solid (deflection of a bimetallic element H01H 37/52)
References relevant to classification in this group
This subclass/group does not cover:
Deflection of a bimetallic element
Means for producing snap action (inherent in bimetallic element H01H 37/54; caused by a magnet H01H 37/66)
References relevant to classification in this group
This subclass/group does not cover:
Inherent in bimetallic element
Snap action caused by a magnet
Resetting means [N: (H01H 37/5409 takes precedence)]
References relevant to classification in this group
This subclass/group does not cover:
Bistable switches; Resetting means for Bistable switches
Switches in which only the opening movement or only the closing movement of a contact is effected by heating or cooling (for the electrical protection of electric lines or electric apparatus H01H 73/00 to H01H 83/00)
Informative references
Attention is drawn to the following places, which may be of interest for search:
Electrical protection of electric lines or electric apparatus
Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material (fuses H01H 85/00)
Informative references
Attention is drawn to the following places, which may be of interest for search:
Switching devices actuated by an explosion produced within the device and initiated by an electric current
Switches providing a selected number of consecutive operations of the contacts by a single manual actuation of the operating part (for telephone communication H04M 1/26)
References relevant to classification in this group
This subclass/group does not cover:
Switches for telephone communication
Time or time-programme switches providing a choice of time intervals for executing one or more switching actions and automatically terminating their operations after the programme is completed (clocks with attached or built-in means operating any device at preselected times or after preselected time-intervals G04C 23/00; [N: apparatus which can be set and started to measure-off predetermined intervals G04F 3/06]; programme-control systems G05B 19/00)
Informative references
Attention is drawn to the following places, which may be of interest for search:
Clocks with attached or built-in means operating any device at preselected times or after preselected time-intervals
Apparatus which can be set and started to measure-off predetermined intervals
Programme-control systems
Details of relays (electric circuit arrangements H01H 47/00; of electromagnetic relays H01H 50/00; details of electrically-operated selector switches H01H 63/00; [N: testing of relays G01R 31/00; relays for emergency protective circuit arrangements H02H])
References relevant to classification in this group
This subclass/group does not cover:
Electric circuit arrangements of electromagnetic relays
Relays for emergency protective circuit arrangements
Informative references
Attention is drawn to the following places, which may be of interest for search:
Electric circuit arrangements
Details of electrically-operated selector switches
Testing of relays
Bases; Casings; Covers (frames for mounting two or more relays or for mounting a relay and another electric component H02B 1/01, H04Q 1/08,H05K)
Informative references
Attention is drawn to the following places, which may be of interest for search:
Frames for mounting two or more relays or for mounting a relay and another electric component
Electromagnetic or electrostatic shielding (casings H01H 45/02; [N: screening in general H05K 9/00])
Informative references
Attention is drawn to the following places, which may be of interest for search:
Casings
Screening in general
Ventilating; Cooling; Heating (for operating electrothermal relays H01H 61/013)
References relevant to classification in this group
This subclass/group does not cover:
Operating electrothermal relays
Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current (circuit arrangements for electro-magnets in general H01F 7/18)
Informative references
Attention is drawn to the following places, which may be of interest for search:
Circuit arrangements for electro-magnets in general
for holding armature in attracted position, e.g. when initial energising circuit is interrupted; for maintaining armature in attracted position, e.g. with reduced energising current [N: (with switching regulator H01H 47/325)]
References relevant to classification in this group
This subclass/group does not cover:
Switching regulators
for introducing delay in the operation of the relay (short-circuited conducting sleeves, bands or discs H01H 50/46)
Informative references
Attention is drawn to the following places, which may be of interest for search:
Short-circuited conducting sleeves, bands or discs
Energising current supplied by magnetic amplifier [N: (magnetic amplifiers H03F 9/00)]
Informative references
Attention is drawn to the following places, which may be of interest for search:
Magnetic amplifiers
Apparatus or processes specially adapted to the manufacture of relays or parts thereof
Details of electromagnetic relays ([N: H01H 51/28 takes precedence;] electric circuit arrangements H01H 47/00; details of electrically-operated select or switches H01H 63/00; [N: testing of relays G01R 31/00; electromagnets in general H01F 7/06; relays for emergency protective circuit arrangements H02H])
References relevant to classification in this group
This subclass/group does not cover:
Relays having both armature and contacts within a sealed casing outside which the operating coil is located, e.g. contact carried by a magnetic leaf spring or reed
Relays for emergency protective circuit arrangements
Informative references
Attention is drawn to the following places, which may be of interest for search:
Electric circuit arrangements
Details of electrically-operated select or switches
Testing of relays
Electromagnets in general
Bases; Casings; Covers (frames for mounting two or more relays or for mounting a relay and another electric component H02B 1/01, H04Q 1/08, H05K)
Informative references
Attention is drawn to the following places, which may be of interest for search:
Frames for mounting two or more relays or for mounting a relay and another electric component
Electromagnetic or electrostatic shielding (casings H01H 50/02; [N: screening in general H05K 9/00])
Informative references
Attention is drawn to the following places, which may be of interest for search:
Casings
Screening in general
Ventilating; Cooling; Heating (for operating electrothermal relays H01H 61/013)
References relevant to classification in this group
This subclass/group does not cover:
Operating electrothermal relays
Terminal arrangements [N: (for coils H01H 50/443)]
References relevant to classification in this group
This subclass/group does not cover:
Terminal arrangements for coils
Magnetic circuit arrangements (cores, yokes, or armatures in general H01F 3/00; magnets in general H01F 7/00)
Informative references
Attention is drawn to the following places, which may be of interest for search:
Cores, yokes, or armatures in general
Magnets in general
Magnetic coils or winding (circuit arrangements H01H 47/00; in general H01F 5/00)
Informative references
Attention is drawn to the following places, which may be of interest for search:
Circuit arrangements
Magnetic coils or winding in general
Short-circuited conducting sleeves, bands, or discs [N: (for electromagnets H01F 7/1205)]
References relevant to classification in this group
This subclass/group does not cover:
Sleeves, bands, or discs for electromagnets
Contact arrangements (contacts for switches in general H01H 1/00)
Informative references
Attention is drawn to the following places, which may be of interest for search:
Contacts for switches in general
moving contact being rigidly combined with movable part of magnetic circuit [N: (for polarised relays H01H 51/2254, H01H 51/2281)]
References relevant to classification in this group
This subclass/group does not cover:
Contacts for polarised relays
Driving arrangements between movable part of magnetic circuit and contact (structurally associated with contact spring sets H01H 50/58)
Informative references
Attention is drawn to the following places, which may be of interest for search:
Driving arrangements structurally associated with contact spring sets
Means for introducing a predetermined time delay between the initiation of the switching operation and the opening or closing of the contacts (circuit arrangements for introducing delay H01H 47/18; short-circuited conducting sleeves, bands, or discs H01H 50/46)
Informative references
Attention is drawn to the following places, which may be of interest for search:
Circuit arrangements for introducing delay
Short-circuited conducting sleeves, bands, or discs
Thermal means (inherent in electrothermal relays H01H 61/00)
References relevant to classification in this group
This subclass/group does not cover:
Thermal means inherent in electrothermal relays
Electromagnetic relays (relays using the dynamo-electric effect H01H 53/00)
Informative references
Attention is drawn to the following places, which may be of interest for search:
Relays using the dynamo-electric effect
Relays in which the armature is maintained in one position by a permanent magnet and freed by energisation of a coil producing an opposing magnetic field [N: (H01H 51/02 to H01H 51/26 take precedence)]
Special rules of classification within this group

H01H 51/02 to H01H 51/26 take precedence over H01H 51/01.

Armature is movable between two limit positions of rest and is moved in one direction due to energisation of an electromagnet and after the electromagnet is de-energised is returned by energy stored during the movement in the first direction, e.g. by using a spring, by using a permanent magnet, by gravity [N: (motors with armature moved one way and returned by spring in general H02K 33/02)]
Informative references
Attention is drawn to the following places, which may be of interest for search:
Motors with armature moved one way and returned by spring in general
Armature is movable between two limit positions of rest and is moved in both directions due to the energisation of one or the other of two electromagnets without the storage of energy to effect the return movement [N: (motors with armature moved one way and returned by spring in general H02K 33/02)]
Informative references
Attention is drawn to the following places, which may be of interest for search:
Motors with armature moved one way and returned by spring in general
Polarised relays [N: (H01H 51/28 takes precedence)]
References relevant to classification in this group
This subclass/group does not cover:
Relays having both armature and contacts within a sealed casing outside which the operating coil is located, e.g. contact carried by a magnetic leaf spring or reed
Relays having both armature and contacts within a sealed casing outside which the operating coil is located, e.g. contact carried by a magnetic leaf spring or reed (H01H 51/27 takes precedence)
References relevant to classification in this group
This subclass/group does not cover:
Relays with armature having two stable magnetic states and operated by change from one state to the other
Relays having armature, contacts, and operating coil within a sealed casing (H01H 51/27 takes precedence)
References relevant to classification in this group
This subclass/group does not cover:
Relays with armature having two stable magnetic states and operated by change from one state to the other
Frequency relays; Mechanically-tuned relays [N: (switched devices for electric time devices G04C; electromechanical resonaters H03H 9/00; telegraph circuits with oscillating relay H04L 25/205); mechanical means for producing a desired natural frequency of operation of the contacts H01H 50/74)]
Informative references
Attention is drawn to the following places, which may be of interest for search:
Switched devices for electric time devices
Electromechanical resonaters
Telegraph circuits with oscillating relay
Mechanical means for producing a desired natural frequency of operation of the contacts
Relays using the dynamo-electric effect, i.e. relays in which contacts are opened or closed due to relative movement of current-carrying conductor and magnetic field caused by force of interaction between them
Induction relays, i.e. relays in which the interaction is between a magnetic field and current induced thereby in a conductor [N: (parts of protective circuit arrangements H02H 1/00)]
Informative references
Attention is drawn to the following places, which may be of interest for search:
Parts of protective circuit arrangements
Contacts actuated by an electric motor through fluid-pressure transmission, e.g. using a motor-driven pump [N: (switches using dynamo-electric motor H01H 3/26)]
Informative references
Attention is drawn to the following places, which may be of interest for search:
Switches using dynamo-electric motor
Magnetostrictive relays
Electrostrictive relays; Piezo-electric relays
Electrostatic relays; Electro-adhesion relays ([N: electrostatic measuring instruments G01R 5/28]; clutches in general using the Johnson-Rahbek effect H02N 13/00; [N: electrostatic transducers H04R 19/00; systems for preventing the formation of electrostatic charges H05F])
Informative references
Attention is drawn to the following places, which may be of interest for search:
Electrostatic measuring instruments
Clutches in general using the Johnson-Rahbek effect
Electrostatic transducers
Systems for preventing the formation of electrostatic charges
Electrothermal relays (thermal switches not operated by electrical input, thermal switches with anticipating electrical input H01H 37/00; thermally-sensitive members H01H 37/32)
References relevant to classification in this group
This subclass/group does not cover:
Thermal switches not operated by electrical input, thermal switches with anticipating electrical input
Informative references
Attention is drawn to the following places, which may be of interest for search:
Thermally-sensitive members
Details of electrically-operated selector switches (details of relays H01H 45/00)
Informative references
Attention is drawn to the following places, which may be of interest for search:
Details of relays
Bases; Cases; Covers; Mountings (racks for mounting selectors with or without other exchange equipment H04Q 1/04); Mounting of fuses on selector switch
Informative references
Attention is drawn to the following places, which may be of interest for search:
Racks for mounting selectors with or without other exchange equipment
Apparatus or processes specially adapted to the manufacture of selector switches or parts thereof
Electrically-operated selector switches (details thereof H01H 63/00; selecting in general H04Q)
References relevant to classification in this group
This subclass/group does not cover:
Details of electrically-operated selector switches
Informative references
Attention is drawn to the following places, which may be of interest for search:
Selecting in general
Apparatus or processes for the manufacture of emergency protective devices (manufacture of switches in general H01H 11/00; manufacture of relays in general H01H 49/00)
Informative references
Attention is drawn to the following places, which may be of interest for search:
Manufacture of switches in general
Manufacture of relays in general
for calibrating or setting of devices to function under predetermined conditions (measuring electric values G01R)
Informative references
Attention is drawn to the following places, which may be of interest for search:
Measuring electric values
Details of the protective switches or relays covered by groups H01H 73/00 to H01H 83/00
Means for indicating condition of the switching device [N: (by means of an auxiliary contact H01H 71/46)]
References relevant to classification in this group
This subclass/group does not cover:
Means for indicating condition of the switching device by means of an auxiliary contact
Terminals; Connections (in general H01R)
Informative references
Attention is drawn to the following places, which may be of interest for search:
Terminals and Connections in general
Electrothermal mechanisms [N: (combined with a electro-thermal time delay relay H01H 61/002)]
References relevant to classification in this group
This subclass/group does not cover:
Electrothermal mechanisms combined with a electro-thermal time delay relay
with bimetal element [N: (combined with detection of imbalance of two or more currents H01H 83/223)]
References relevant to classification in this group
This subclass/group does not cover:
Bimetal elements combined with detection of imbalance of two or more currents
with windings acting in opposition [N: (H01H 71/2436 takes precedence)]
References relevant to classification in this group
This subclass/group does not cover:
Windings acting in opposition
having means for introducing a predetermined time delay (by short-circuited winding H01H 71/30; by additional armature H01H 71/34)
References relevant to classification in this group
This subclass/group does not cover:
Short-circuited winding
Additional armature
Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
Plug-in housings [N: (for a plurality of juxtaposed housings H02B 1/056)]
References relevant to classification in this group
This subclass/group does not cover:
Plug-in housings for a plurality of juxtaposed housings
Means for indicating condition of the switch [N: (by means of an auxiliary contact H01H 71/46)]
References relevant to classification in this group
This subclass/group does not cover:
Indicating condition of the switch by means of an auxiliary contact
Means for extinguishing or suppressing arc [N: (in general H01H 9/30 to H01H 9/46; magnet coil acting as blow-out device H01H 71/38)]
Informative references
Attention is drawn to the following places, which may be of interest for search:
Means for extinguishing or suppressing arc in general
Magnet coil acting as blow-out device
Terminals; Connections (in general H01R)
Informative references
Attention is drawn to the following places, which may be of interest for search:
Terminals and Connections in general
having electrothermal release and no other automatic release (cartridge type H01H 73/62)
References relevant to classification in this group
This subclass/group does not cover:
Cartridge type
having electromagnetic release and no other automatic release (cartridge type H01H 73/64)
References relevant to classification in this group
This subclass/group does not cover:
Cartridge type
having both electrothermal and electromagnetic automatic release (cartridge type H01H 73/66)
References relevant to classification in this group
This subclass/group does not cover:
Cartridge type
Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of power reset mechanism
Reset mechanisms for automatically reclosing a limited number of times (circuit arrangements H02H 3/06)
Informative references
Attention is drawn to the following places, which may be of interest for search:
Circuit arrangements
Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting (H01H 73/00, H01H 75/00 take precedence)
References relevant to classification in this group
This subclass/group does not cover:
Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of power reset mechanism
with electromagnetic opening [N: (combined with electromagnetic release mechanism H01H 71/2409)]
References relevant to classification in this group
This subclass/group does not cover:
Electromagnetic opening combined with electromagnetic release mechanism
with electrodynamic opening [N: (combined with electromagnetic release mechanism H01H 71/2418)]
References relevant to classification in this group
This subclass/group does not cover:
Electrodynamic opening combined with electromagnetic release mechanism
Protective switches in which excess current causes the closing of contacts, e.g. for short-circuiting the apparatus to be protected [N: (H01H 39/004 takes precedence)]
References relevant to classification in this group
This subclass/group does not cover:
Protective switches in which excess current causes the closing of contacts, e.g. for short-circuiting the apparatus to be protected
Protective switches in which contacts are normally closed but are repeatedly opened and reclosed as long as a condition causing excess current persists, e.g. for current limiting
Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
operated by earth fault currents (H01H 83/14 takes precedence)
References relevant to classification in this group
This subclass/group does not cover:
Operated by unbalance of two or more currents or voltages, e.g. for differential protection
Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive (switches actuated by melting of fusible material H01H 37/76; automatic release of protective switches due to fusion of a mass H01H 73/00 to H01H 83/00; disposition or arrangement of fuses on boards H02B 1/18)
References relevant to classification in this group
This subclass/group does not cover:
Switches actuated by melting of fusible material
Automatic release of protective switches due to fusion of a mass
Informative references
Attention is drawn to the following places, which may be of interest for search:
Disposition or arrangement of fuses on boards
General constructions or structure of low voltage fuses, i.e. below 1000 V, or of fuses where the applicable voltage is not specified (H01H 85/046 to H01H 85/048 take precedence)
Special rules of classification within this group

H01H 85/046 to H01H 85/048 take precedence over H01H 85/044.

fast or slow type (H01H 85/045 to H01H 85/048 take precedence)
Special rules of classification within this group

H01H 85/045 to H01H 85/048 take precedence over H01H 85/0445.

characterised by the fusible material (H01H 85/11 takes precedence)
References relevant to classification in this group
This subclass/group does not cover:
M-effect devices
with constriction for localised fusing (H01H 85/11 takes precedence)
References relevant to classification in this group
This subclass/group does not cover:
M-effect devices
Casings (electrical contacts H01H 85/143; fillings H01H 85/18)
Informative references
Attention is drawn to the following places, which may be of interest for search:
Electrical contacts
Fillings
Bases for supporting the fuse; Separate parts thereof (bases, casings for connectors, in general H01R)
Informative references
Attention is drawn to the following places, which may be of interest for search:
Bases, casings for connectors, in general
Safety arrangements preventing or inhibiting contact with live parts, including operation of isolation on removal of cover (interlocking between casing or protective shutter of a switch and mechanism for operating its contacts H01H 9/22)
Informative references
Attention is drawn to the following places, which may be of interest for search:
Interlocking between casing or protective shutter of a switch and mechanism for operating its contacts
Means for extinguishing or suppressing arc (by powder filling H01H 85/18; by mechanical tension applied to fusible member H01H 85/36)
References relevant to classification in this group
This subclass/group does not cover:
Means for extinguishing or suppressing arc by powder filling
Means for extinguishing or suppressing arc by mechanical tension applied to fusible member
using an arc-extinguishing liquid (characterised by the composition of the liquid H01H 33/22)
References relevant to classification in this group
This subclass/group does not cover:
Arc-extinguishing liquid characterised by the composition of the liquid
using an arc-extinguishing gas (characterised by the composition of the gas H01H 33/22)
References relevant to classification in this group
This subclass/group does not cover:
Arc-extinguishing gas characterised by the composition of the gas
Protective devices in which a current flowing through a liquid or solid is interrupted by the evaporation of the liquid or by the melting and evaporation of the solid when the current becomes excessive, the circuit continuity being re-established on cooling
Combinations of two or more different basic types of electric switches, relays, selectors and emergency protective devices, not covered by a single one of the preceding main groups
This page is owned by Office of Patent Classification.
Last Modified: 10/11/2013