CPC Definition - Subclass H01H

Last Updated Version: 2019.05
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 place 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.

Relationships with other classification places

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
Limiting references

This place does not cover:

Controlling members for hand actuation by rotary movement, e.g. hand wheels

G05G 1/08

Contact cables

H01B 7/10

Electrolytic self-interrupters

H01G 9/18

Switches combined with plug-and-socket connectors

H01R 13/70

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

H02B 1/26

Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection

H02H 3/00

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

H02J 13/00

Electronic switching or gating, i.e. not by contact-making or -braking

H03K 17/00

Mechanical details directly producing electronic effects

H03K 17/94

Casings for electrical apparatus in general

H05K 5/00

Application-oriented references

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

Keyboards for special applications, see the relevant subclasses or groups, e.g.

B41J, G06F 3/023, H04L 15/00, H04L 17/00, H04M 1/00

Switches mounted on the steering wheel

B60Q 1/0082

Lever attached to steering wheel for controlling the lights of a car, e.g. steering column stalk switches

B60Q 1/1469

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

G05G 9/047

Switching arrangements for the supply or distribution of electric power

H02B

Mounting switch and fuse separately on, or in, common support

H02B

Frameworks for mounting two or more relays or for mounting a relay and another electrical component

H02B 1/01, H04Q 1/08

Arrangements of switchgear in which switches are enclosed in, or structurally associated with, a casing; Gas-insulated switchgear

H02B 13/035

Switches for telephonic communication

H04M 1/26

Informative references

Attention is drawn to the following places, which may be of interest for search:

Micromechanical devices, comprising flexible or deformable elements

B81B 3/00

Processes or apparatus specially adapted for the manufacture or treatment of microstructural devices or systems, e.g. in combination with electrical devices

B81C

Sensing elements for providing continuous conversion of a variable into mechanical displacement

G01

Measuring distances, levels or bearings

G01C

Measuring liquid level

G01F

Temperature-responsive elements in general

G01K

Measuring electric values

G01R

Arrangements for locating electric faults; Testing of relays

G01R 31/00

Clocks with attached or built-in means operating any device at preselected times or after preselected time intervals

G04C 23/00

Input arrangements for converting discrete items of information into a coded form; Programmable keyboards

G06F 3/023

Overvoltage protection resistors, resistive arresters

H01C 7/12, H01C 8/04

Cores, Yokes, or armatures in general

H01F 3/00

Magnetic coils or windings in general

H01F 5/00

Magnets in general

H01F 7/00

Electromagnets; Actuators including electromagnets

H01F 7/06

Circuit arrangements for obtaining desired operating characteristics

H01F 7/18

Variable transformers or inductances having provision for tap-changing without interrupting the load current

H01F 29/04

Capacitors in which the capacitance is varied by using variation of distance between electrodes

H01G 5/16

Switching devices of the waveguide type

H01P

Electric connections in general

H01R

Devices for interrupted current collection; Rotary current collectors, distributors, or interrupters

H01R 39/00

Overvoltage arresters using spark gaps

H01T 4/00

Arcing horns per se

H01T 4/14

Disposition or arrangement of fuses on boards

H02B 1/18

Installations of electric cables or lines in or on buildings, equivalent structures or vehicles

H02G 3/00

Distribution boxes; Connection or junction boxes

H02G 3/08

Constructional features of telephone sets; Construction or mounting of dials or of equivalent devices

H04M 1/23

Selecting apparatus or arrangements in general

H04Q

Special rules of classification

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.

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 place, 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
Limiting references

This place does not cover:

Liquid contacts

H01H 29/04

Special rules of classification

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

Composite materials
Glossary of terms

In this place, 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 {(for circuit breakers H01H 73/045)}
References
Limiting references

This place does not cover:

Bridging contacts for circuit breakers

H01H 73/045

by sliding (by rolling or wrapping H01H 1/16)
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Rolling or wrapping

H01H 1/16

by magnetic force {(combined with electrodynamic opening H01H 77/101)}
References
Limiting references

This place does not cover:

Magnetic force combined with electrodynamic opening

H01H 77/101

Contact arrangements for providing make-before-break operation, e.g. for on-load tap changing {(for tap changers H01H 9/0016)}
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Contact arrangements for tap changers

H01H 9/0016

Electric connections to or between contacts; Terminals ({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
Limiting references

This place does not cover:

Terminals for high tension switches

H01H 33/025

Terminals for electromagnetic relays

H01H 50/14

Terminals for circuit breakers

H01H 71/08

Informative references

Attention is drawn to the following places, which may be of interest for search:

Electric connections in general

H01R

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)
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Cleaning by normal sliding of contacts

H01H 1/18, H01H 1/36

Protective enclosures, baffle plates, or screens for contacts (for arc-extinguishing H01H 9/30; for mercury contacts H01H 29/04)
References
Limiting references

This place does not cover:

Protective enclosures, baffle plates, or screens for arc-extinguishing

H01H 9/30

Protective enclosures, baffle plates, or screens for mercury contacts

H01H 29/04

Mechanisms for operating contacts (snap-action arrangements H01H 5/00; devices for introducing a predetermined time delay H01H 7/00; {for tap changers H01H 9/0027}; thermal actuating or release means H01H 37/02)
References
Limiting references

This place does not cover:

Snap-action arrangements

H01H 5/00

Informative references

Attention is drawn to the following places, which may be of interest for search:

Devices for introducing a predetermined time delay

H01H 7/00

Devices for tap changers

H01H 9/0027

Thermal actuating or release means

H01H 37/02

using pneumatic or hydraulic actuator {(for storing energy in a spring motor H01H 3/301)}
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Storing energy in a spring motor

H01H 3/301

using dynamo-electric motor (for storing energy in a spring motor H01H 3/30)
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Storing energy in a spring motor

H01H 3/301

using electromagnet (for storing energy in a spring motor H01H 3/30; for operating relays H01H 45/00)
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Storing energy in a spring motor

H01H 3/301

Operating relays

H01H 45/00

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
Limiting references

This place does not cover:

Snap-action arrangements

H01H 5/00

Introducing a predetermined time delay

H01H 7/00

Lubricating means structurally associated with the switch (for lubricating contact-making surfaces H01H 1/60)
References
Limiting references

This place does not cover:

Lubricating contact-making surfaces

H01H 1/60

Energy stored by deformation of elastic members (by deformation of bimetallic elements in thermally-actuated switches H01H 37/54)
References
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

H01H 37/54

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)
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Time or time-programme switches

H01H 43/00

with thermal timing means (thermally actuated switches H01H 37/00)
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Thermally actuated switches

H01H 37/00

Devices for ensuring operation of the switch at a predetermined point in the ac cycle (circuit arrangements H01H 9/56)
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Circuit arrangements

H01H 9/56

Details of switching devices, not covered by groups H01H 1/00 - H01H 7/00 (casings for switchgear H02B 1/26; casings for electrical apparatus in general H05K 5/00)
References
Limiting references

This place does not cover:

Casings for switchgear

H02B 1/26

Informative references

Attention is drawn to the following places, which may be of interest for search:

Casings for electrical apparatus in general

H05K 5/00

Bases, casings, or covers (accommodating more than one switch or a switch and another electrical component H02B 1/26)
References
Limiting references

This place does not cover:

Accommodating more than one switch or a switch and another electrical component

H02B 1/26

Adaptation for built-in fuses (mounting switch and fuse separately on, or in, common support H02B)
References
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

H02B

Interlocking, locking, or latching mechanisms (contacts adapted to act as latches H01H 1/52; by an auxiliary movement of the operating part or of an attachment thereto H01H 3/20; {for withdrawable switchgear H02B 11/00})
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Contacts adapted to act as latches

H01H 1/52

Auxiliary movement of the operating partor of an attachment thereto

H01H 3/20

Withdrawable switchgear

H02B 11/00

for interlocking between casing, cover, or protective shutter and mechanism for operating contacts {(explosion-proof cases H01H 9/045; built-in fuses and interlocking mechanisms H01H 9/104; by automatic release of circuit breakers H01H 71/126)}
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Explosion-proof cases

H01H 9/045

Built-in fuses and interlocking mechanisms

H01H 9/104

By automatic release of circuit breakers

H01H 71/126

for interlocking two or more switches ({H01H 13/568 takes precedence}; by a detachable member H01H 9/28 {; for electromagnetic relays H01H 50/323})
References
Limiting references

This place does not cover:

Contacts also returning by some external action, e.g. interlocking, protection, remote control

H01H 13/568

Informative references

Attention is drawn to the following places, which may be of interest for search:

Detachable member

H01H 9/28

Electromagnetic relays

H01H 50/323

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)
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Switches operated by a key

H01H 27/00

Locking by removable part of two-part coupling device

H01R

Auxiliary contacts on to which the arc is transferred from the main contacts (using arcing-horns H01H 9/46)
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Arcing-horns

H01H 9/46

Multiple main contacts for the purpose of dividing the current through, or potential drop along, the arc {(multiple parallel contact bars H01H 1/226)}
References
Limiting references

This place does not cover:

Multiple parallel contact bars

H01H 1/226

using arcing-horn (using blow-out magnet H01H 9/44; arcing-horns per se H01T 4/14)
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Blow-out magnet

H01H 9/44

Arcing-horns per se

H01T 4/14)

Cooling of switch parts (cooling of contacts H01H 1/62)
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Cooling of contacts

H01H 1/62

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 microstructural devices or systems, e.g. in combination with electrical devices, B81C)
References
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

H01H 13/88

Processes or apparatus specially adapted for the manufacture or treatment of microstructural devices or systems, e.g. in combination with electrical devices

B81C

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
Limiting references

This place does not cover:

Switches wherein the operating part is flexible

H01H 17/00

Details (specially adapted for rectilinearly movable switches having operating members associated with different sets of contacts, e.g. keyboards, H01H 13/70)
References
Limiting references

This place does not cover:

Specially adapted for rectilinearly movable switches having operating members associated with different sets of contacts, e.g. keyboards

H01H 13/70

acting with snap action (depending upon deformation of elastic member H01H 13/26)
References
Limiting references

This place does not cover:

Snap action depending upon deformation of elastic member

H01H 13/26

the contact returning to its original state upon manual release of a latch (latch released by second push-button H01H 13/68)
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Latch released by second push-button

H01H 13/68

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)
References
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

H01H 15/22

having a plurality of operating members associated with different sets of contacts, e.g. keyboard ({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)
References
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

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

characterised by the layers, e.g. by their material or stucture (H01H 13/703 takes precedence)
References
Limiting references

This place does not cover:

Spacers between contact carrying layers

H01H 13/703

characterised by ergonomic functions, e.g. for miniature keyboards; characterised by operational sensory functions, e.g. sound feedback (legends H01H 13/83)
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Legends

H01H 13/83

Switches having flexible operating part adapted only for pulling, e.g. cord, chain {(for emergency stop switches H01H 3/0226)}
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Flexible operating part adapted for emergency stop switches

H01H 3/0226

Stationary parts (guides H01H 17/14)
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Movable parts (guides H01H 17/14)
References
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
Limiting references

This place does not cover:

Rotary current collectors, distributors or interrupters

H01R 39/00

Contacts actuated by axial cams (H01H 19/6355 takes precedence)
References
Limiting references

This place does not cover:

Axial cam devices for transforming the angular movement into linear movement along the axis of rotation

H01H 19/6355

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
Limiting references

This place does not cover:

Tumbler or rocker switches

H01H 23/00

Switches having an operating part movable angularly in more than one plane

H01H 25/04

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 place, 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 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
Limiting references

This place does not cover:

Locking switch parts to prevent operation

H01H 9/28

Informative references

Attention is drawn to the following places, which may be of interest for search:

Switches combined with plug-and-socket connectors

H01R

Switches with current-carrying plug

H01R 31/08

Switches having at least one liquid contact (solid contacts wetted or soaked with mercury H01H 1/08)
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Solid contacts wetted or soaked with mercury

H01H 1/08

operated by tilting contact-liquid container (centrifugal mercury switches H01H 29/26)
References
Limiting references

This place does not cover:

Centrifugal mercury switches

H01H 29/26

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
Limiting references

This place does not cover:

Switches operated by direct electrodynamic action

H01H 53/00

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
Limiting references

This place does not cover:

Air-break switches in combination with high tension or heavy-current switches with arc-extinguishing or arc-preventing means

H01H 33/00

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

H02B

Interlocking mechanisms (for interlocking with high-tension or heavy-current switches having arc-extinguishing or arc-preventing means H01H 33/52)
References
Limiting references

This place does not cover:

Interlocking with high-tension or heavy-current switches having arc-extinguishing or arc-preventing means

H01H 33/52

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
Limiting references

This place does not cover:

Interlocking with high-tension or heavy-current switches having arc-extinguishing or arc-preventing means

H01H 33/52

Means for extinguishing or preventing arc between current-carrying parts (for switches in general H01H 9/30)
References
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

H01H 9/30

Auxiliary contacts on to which the arc is transferred from the main contacts (using arcing horns H01H 33/20)
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Auxiliary contacts using arcing horns

H01H 33/20

using blow-out magnet {(for vacuum switches H01H 33/664; pressure-generated arcs rotated by a magnetic field H01H 33/982)}
References
Limiting references

This place does not cover:

Vacuum switches

H01H 33/664

Pressure-generated arcs rotated by a magnetic field

H01H 33/982

using arcing horns (using blow-out magnet H01H 33/18; arcing horns per se H01T 4/14)
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Using blow-out magnet

H01H 33/18

Arcing horns per se

H01T 4/14

using dynamo-electric motor (for storing energy in a spring motor H01H 33/40)
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Storing energy in a spring motor

H01H 33/40

using electromagnet (for storing energy in a spring motor H01H 33/40)
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Storing energy in a spring motor

H01H 33/40

Devices for ensuring operation of the switch at a predetermined point in the ac cycle (circuit arrangements H01H 33/59)
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Circuit arrangements

H01H 33/59

Cases (for switchgear H02B 1/26); Reservoirs, tanks, piping or valves, for arc-extinguishing fluid; Accessories therefor, e.g. safety arrangements, pressure relief devices
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Cases for switchgear

H02B 1/26

Oil reservoirs or tanks; Lowering means therefor (associated with withdrawal mechanism for isolation of switch H02B 11/08)
References
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

H02B 11/08

wherein the break is in gas (in air at atmospheric pressure H01H 33/62; vacuum switches H01H 33/66)
References
Limiting references

This place does not cover:

Breaks in air at atmospheric pressure

H01H 33/62

Informative references

Attention is drawn to the following places, which may be of interest for search:

Vacuum switches

H01H 33/66

wherein the break is in gas (in air at atmospheric pressure H01H 33/73)
References
Limiting references

This place does not cover:

Breaks in air at atmospheric pressure

H01H 33/73

wherein the break is in gas (in air at atmospheric pressure H01H 33/77)
References
Limiting references

This place does not cover:

Breaks in air at atmospheric pressure

H01H 33/77

this movement being effected solely due to the pressure caused by the arc itself or by an auxiliary arc {(H01H 33/903 takes precedence)}
References
Limiting references

This place 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

H01H 33/903

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 {(H01H 33/901 takes precedence)}
References
Limiting references

This place 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

H01H 33/901

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 - H01H 61/00; sensing elements for providing continuous conversion of a variable into mechanical displacement G01)
References
Limiting references

This place does not cover:

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 - H01H 61/00

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

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)
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Switches operated by change of fluid flow

H01H 35/24

Centrifugal switches (level of mercury displaced by centrifugal action H01H 29/26)
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Level of mercury displaced by centrifugal action

H01H 29/26

Switches operated by change of acceleration, e.g. by shock or vibration, inertia switch {(wherein the liquid constitutes a contact of the switch H01H 29/002)}
References
Limiting references

This place does not cover:

Switches operated by change of acceleration, wherein the liquid constitutes a contact of the switch

H01H 29/002

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
Limiting references

This place does not cover:

Switches operated by change of acceleration, wherein the liquid constitutes a contact of the switch

H01H 29/002

Informative references

Attention is drawn to the following places, which may be of interest for search:

Switches operated by magnet carried on a float

H01H 36/02

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
Limiting references

This place 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

H01H 37/36

Switches actuated by change of magnetic field or of electric field, e.g. by change of relative position of magnet and switch, by shielding {(specially adapted for electromechanical clocks or watches G04C 3/004)}
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Switches specially adapted for electromechanical clocks or watches

G04C 3/004

Thermally-actuated switches (electrothermal relays operated by electrical input H01H 61/00; protective switches with electrothermal release or actuation H01H 73/00 - H01H 83/00)
References
Limiting references

This place does not cover:

Electrothermal relays operated by electrical input

H01H 61/00

Protective switches with electrothermal release or actuation

H01H 73/00 - H01H 83/00

Bases; Housings; Mountings {(H01H 37/5427 takes precedence)}
References
Limiting references

This place does not cover:

Encapsulated in sealed miniaturised housing

H01H 37/5427

Thermally-sensitive members (temperature responsive elements in general G01K)
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Temperature responsive elements in general

G01K

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
Limiting references

This place does not cover:

Fluid forming a contact of the switch

H01H 29/04, H01H 29/30

actuated due to expansion or contraction of a solid (deflection of a bimetallic element H01H 37/52)
References
Limiting references

This place does not cover:

Deflection of a bimetallic element

H01H 37/52

Means for producing snap action (inherent in bimetallic element H01H 37/54; caused by a magnet H01H 37/66)
References
Limiting references

This place does not cover:

Inherent in bimetallic element

H01H 37/54

Snap action caused by a magnet

H01H 37/66

Resetting means {(H01H 37/5409 takes precedence)}
References
Limiting references

This place does not cover:

Bistable switches; Resetting means for Bistable switches

H01H 37/5409

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 - H01H 83/00)
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Electrical protection of electric lines or electric apparatus

H01H 73/00 - H01H 83/00

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)
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

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
Limiting references

This place does not cover:

Switches for telephone communication

H04M 1/26

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; {apparatus which can be set and started to measure-off predetermined intervals G04F 3/06}; programme-control systems G05B 19/00)
References
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

G04C 23/00

Apparatus which can be set and started to measure-off predetermined intervals

G04F 3/06

Programme-control systems

G05B 19/00

Details of relays (electric circuit arrangements H01H 47/00; of electromagnetic relays H01H 50/00; details of electrically-operated selector switches H01H 63/00 {; testing of relays G01R 31/00; relays for emergency protective circuit arrangements H02H})
References
Limiting references

This place does not cover:

Electric circuit arrangements of electromagnetic relays

H01H 50/00

Relays for emergency protective circuit arrangements

H02H

Informative references

Attention is drawn to the following places, which may be of interest for search:

Electric circuit arrangements

H01H 47/00

Details of electrically-operated selector switches

H01H 63/00

Testing of relays

G01R 31/00

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)
References
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

H02B 1/01, H04Q 1/08, H05K

Electromagnetic or electrostatic shielding (casings H01H 45/02 {; screening in general H05K 9/00})
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Casings

H01H 45/02

Screening in general

H05K 9/00

Ventilating; Cooling; Heating (for operating electrothermal relays H01H 61/013)
References
Limiting references

This place does not cover:

Operating electrothermal relays

H01H 61/013

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)
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Circuit arrangements for electro-magnets in general

H01F 7/18

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 {(with switching regulator H01H 47/325)}
References
Limiting references

This place does not cover:

Switching regulators

H01H 47/325

for introducing delay in the operation of the relay (short-circuited conducting sleeves, bands or discs H01H 50/46)
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Short-circuited conducting sleeves, bands or discs

H01H 50/46

Energising current supplied by magnetic amplifier {(magnetic amplifiers H03F 9/00)}
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Magnetic amplifiers

H03F 9/00

Details of electromagnetic relays ({H01H 51/28 takes precedence;} electric circuit arrangements H01H 47/00; details of electrically-operated select or switches H01H 63/00; {testing of relays G01R 31/00; electromagnets in general H01F 7/06; relays for emergency protective circuit arrangements H02H})
References
Limiting references

This place 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

H01H 51/28

Relays for emergency protective circuit arrangements

H02H

Informative references

Attention is drawn to the following places, which may be of interest for search:

Electric circuit arrangements

H01H 47/00

Details of electrically-operated select or switches

H01H 63/00

Testing of relays

G01R 31/00

Electromagnets in general

H01F 7/06

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)
References
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

H02B 1/01, H04Q 1/08, H05K

Electromagnetic or electrostatic shielding (casings H01H 50/02 {; screening in general H05K 9/00})
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Casings

H01H 45/02

Screening in general

H05K 9/00

Ventilating; Cooling; Heating (for operating electrothermal relays H01H 61/013)
References
Limiting references

This place does not cover:

Operating electrothermal relays

H01H 61/013

Terminal arrangements {(for coils H01H 50/443)}
References
Limiting references

This place does not cover:

Terminal arrangements for coils

H01H 50/443

Magnetic circuit arrangements (cores, yokes, or armatures in general H01F 3/00; magnets in general H01F 7/00)
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Cores, yokes, or armatures in general

H01F 3/00

Magnets in general

H01F 7/00

Magnetic coils or winding (circuit arrangements H01H 47/00; in general H01F 5/00)
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Circuit arrangements

H01H 47/00

Magnetic coils or winding in general

H01F 5/00

Short-circuited conducting sleeves, bands, or discs {(for electromagnets H01F 7/1205)}
References
Limiting references

This place does not cover:

Sleeves, bands, or discs for electromagnets

H01F 7/1205

Contact arrangements (contacts for switches in general H01H 1/00)
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Contacts for switches in general

H01H 1/00

moving contact being rigidly combined with movable part of magnetic circuit {(for polarised relays H01H 51/2254, H01H 51/2281)}
References
Limiting references

This place does not cover:

Contacts for polarised relays

H01H 51/2254, H01H 51/2281

Driving arrangements between movable part of magnetic circuit and contact (structurally associated with contact spring sets H01H 50/58)
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Driving arrangements structurally associated with contact spring sets

H01H 50/58

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)
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Circuit arrangements for introducing delay

H01H 47/18

Short-circuited conducting sleeves, bands, or discs

H01H 50/46

Thermal means (inherent in electrothermal relays H01H 61/00)
References
Limiting references

This place does not cover:

Thermal means inherent in electrothermal relays

H01H 61/00

Electromagnetic relays (relays using the dynamo-electric effect H01H 53/00)
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Relays using the dynamo-electric effect

H01H 53/00

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 {(H01H 51/02 - H01H 51/26 take precedence)}
Special rules of classification

H01H 51/02 - 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 {(motors with armature moved one way and returned by spring in general H02K 33/02)}
References
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

H02K 33/02

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 {(motors with armature moved one way and returned by spring in general H02K 33/02)}
References
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

H02K 33/02

Polarised relays {(H01H 51/28 takes precedence)}
References
Limiting references

This place 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

H01H 51/28

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
Limiting references

This place does not cover:

Relays with armature having two stable magnetic states and operated by change from one state to the other

H01H 51/27

Relays having armature, contacts, and operating coil within a sealed casing (H01H 51/27 takes precedence)
References
Limiting references

This place does not cover:

Relays with armature having two stable magnetic states and operated by change from one state to the other

H01H 51/27

Frequency relays; Mechanically-tuned relays {(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)}
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Mechanical means for producing a desired natural frequency of operation of the contacts

H01H 50/74

Switched devices for electric time devices

G04C

Electromechanical resonaters

H03H 9/00

Telegraph circuits with oscillating relay

H04L 25/205

Induction relays, i.e. relays in which the interaction is between a magnetic field and current induced thereby in a conductor {(parts of protective circuit arrangements H02H 1/00)}
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Parts of protective circuit arrangements

H02H 1/00

Contacts actuated by an electric motor through fluid-pressure transmission, e.g. using a motor-driven pump {(switches using dynamo-electric motor H01H 3/26)}
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Switches using dynamo-electric motor

H01H 3/26

Electrostatic relays; Electro-adhesion relays ({electrostatic measuring instruments G01R 5/28}; clutches in general using the Johnson-Rahbek effect H02N 13/00; {electrostatic transducers H04R 19/00; systems for preventing the formation of electrostatic charges H05F})
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Electrostatic measuring instruments

G01R 5/28

Clutches in general using the Johnson-Rahbek effect

H02N 13/00

Electrostatic transducers

H04R 19/00

Systems for preventing the formation of electrostatic charges

H05F

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
Limiting references

This place does not cover:

Thermal switches not operated by electrical input, thermal switches with anticipating electrical input

H01H 37/00

Informative references

Attention is drawn to the following places, which may be of interest for search:

Thermally-sensitive members

H01H 37/32

Details of electrically-operated selector switches (details of relays H01H 45/00)
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Details of relays

H01H 45/00

Bases; Cases; Covers; Mountings (racks for mounting selectors with or without other exchange equipment H04Q 1/04); Mounting of fuses on selector switch
References
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

H04Q 1/04

Electrically-operated selector switches (details thereof H01H 63/00; selecting in general H04Q)
References
Limiting references

This place does not cover:

Details of electrically-operated selector switches

H01H 63/00

Informative references

Attention is drawn to the following places, which may be of interest for search:

Selecting in general

H04Q

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)
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Manufacture of switches in general

H01H 11/00

Manufacture of relays in general

H01H 49/00

for calibrating or setting of devices to function under predetermined conditions (measuring electric values G01R)
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Measuring electric values

G01R

Means for indicating condition of the switching device {(by means of an auxiliary contact H01H 71/46)}
References
Limiting references

This place does not cover:

Means for indicating condition of the switching device by means of an auxiliary contact

H01H 71/46

Terminals; Connections (in general H01R)
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Terminals and Connections in general

H01R

Electrothermal mechanisms {(combined with a electro-thermal time delay relay H01H 61/002)}
References
Limiting references

This place does not cover:

Electrothermal mechanisms combined with a electro-thermal time delay relay

H01H 61/002

with bimetal element {(combined with detection of imbalance of two or more currents H01H 83/223)}
References
Limiting references

This place does not cover:

Bimetal elements combined with detection of imbalance of two or more currents

H01H 83/223

with windings acting in opposition {(H01H 71/2436 takes precedence)}
References
Limiting references

This place does not cover:

Windings acting in opposition

H01H 71/2436

having means for introducing a predetermined time delay (by short-circuited winding H01H 71/30; by additional armature H01H 71/34)
References
Limiting references

This place does not cover:

Short-circuited winding

H01H 71/30

Additional armature

H01H 71/34

Plug-in housings {(for a plurality of juxtaposed housings H02B 1/056)}
References
Limiting references

This place does not cover:

Plug-in housings for a plurality of juxtaposed housings

H02B 1/056

Means for indicating condition of the switch {(by means of an auxiliary contact H01H 71/46)}
References
Limiting references

This place does not cover:

Indicating condition of the switch by means of an auxiliary contact

H01H 71/46

Means for extinguishing or suppressing arc {(in general H01H 9/30 - H01H 9/46; magnet coil acting as blow-out device H01H 71/38)}
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Means for extinguishing or suppressing arc in general

H01H 9/30 - H01H 9/46

Magnet coil acting as blow-out device

H01H 71/38

Terminals; Connections (in general H01R)
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Terminals and Connections in general

H01R

having electrothermal release and no other automatic release (cartridge type H01H 73/62)
References
Limiting references

This place does not cover:

Cartridge type

H01H 73/62

having electromagnetic release and no other automatic release (cartridge type H01H 73/64)
References
Limiting references

This place does not cover:

Cartridge type

H01H 73/64

having both electrothermal and electromagnetic automatic release (cartridge type H01H 73/66)
References
Limiting references

This place does not cover:

Cartridge type

H01H 73/66

Reset mechanisms for automatically reclosing a limited number of times (circuit arrangements H02H 3/06)
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Circuit arrangements

H02H 3/06

Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting (H01H 73/00, H01H 75/00 take precedence)
References
Limiting references

This place 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

H01H 73/00

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

H01H 75/00

with electromagnetic opening {(combined with electromagnetic release mechanism H01H 71/2409)}
References
Limiting references

This place does not cover:

Electromagnetic opening combined with electromagnetic release mechanism

H01H 71/2409

with electrodynamic opening {(combined with electromagnetic release mechanism H01H 71/2418)}
References
Limiting references

This place does not cover:

Electrodynamic opening combined with electromagnetic release mechanism

H01H 71/2418

Protective switches in which excess current causes the closing of contacts, e.g. for short-circuiting the apparatus to be protected {(H01H 39/004 takes precedence)}
References
Limiting references

This place does not cover:

Protective switches in which excess current causes the closing of contacts, e.g. for short-circuiting the apparatus to be protected

H01H 39/004

operated by earth fault currents (H01H 83/14 takes precedence)
References
Limiting references

This place does not cover:

Operated by unbalance of two or more currents or voltages, e.g. for differential protection

H01H 83/14

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 - H01H 83/00; disposition or arrangement of fuses on boards H02B 1/18)
References
Limiting references

This place does not cover:

Switches actuated by melting of fusible material

H01H 37/76

Automatic release of protective switches due to fusion of a mass

H01H 73/00 - H01H 83/00

Informative references

Attention is drawn to the following places, which may be of interest for search:

Disposition or arrangement of fuses on boards

H02B 1/18

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 - H01H 85/048 take precedence)
Special rules of classification

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

fast or slow type (H01H 85/045 - H01H 85/048 take precedence)
Special rules of classification

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

characterised by the fusible material (H01H 85/11 takes precedence)
References
Limiting references

This place does not cover:

M-effect devices

H01H 85/11

with constriction for localised fusing (H01H 85/11 takes precedence)
References
Limiting references

This place does not cover:

M-effect devices

H01H 85/11

Casings (electrical contacts H01H 85/143; fillings H01H 85/18)
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Electrical contacts

H01H 85/143

Fillings

H01H 85/18

Bases for supporting the fuse; Separate parts thereof (bases, casings for connectors, in general H01R)
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Bases, casings for connectors, in general

H01R

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)
References
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

H01H 9/22

Means for extinguishing or suppressing arc (by powder filling H01H 85/18; by mechanical tension applied to fusible member H01H 85/36)
References
Limiting references

This place does not cover:

Means for extinguishing or suppressing arc by powder filling

H01H 85/18

Means for extinguishing or suppressing arc by mechanical tension applied to fusible member

H01H 85/36

using an arc-extinguishing liquid (characterised by the composition of the liquid H01H 33/22)
References
Limiting references

This place does not cover:

Arc-extinguishing liquid characterised by the composition of the liquid

H01H 33/22

using an arc-extinguishing gas (characterised by the composition of the gas H01H 33/22)
References
Limiting references

This place does not cover:

Arc-extinguishing gas characterised by the composition of the gas

H01H 33/22