US 9,812,276 B2
Molded-case circuit breaker
Pavel Naiman, Letohrad (CZ); Milos Petracek, Letohrad (CZ); and Christoph Weber, Ergoldsbach (DE)
Assigned to SIEMENS AKTIENGESELLSCHAFT, Munich (DE)
Filed by Siemens Aktiengesellschaft, München (DE)
Filed on Aug. 19, 2015, as Appl. No. 14/829,978.
Claims priority of application No. 10 2014 223 998 (DE), filed on Nov. 25, 2014.
Prior Publication US 2016/0148766 A1, May 26, 2016
Int. Cl. H01H 71/04 (2006.01); H01H 71/52 (2006.01)
CPC H01H 71/522 (2013.01) [H01H 71/04 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A molded-case circuit breaker, comprising:
a handle, movable between an “ON” position and an “OFF” position;
a contact system, including at least one stationary contact and a movable contact;
an actuating device, operatively connected to the handle and the contact system such that, when the handle is actuated, the contact system is openable and closeable, wherein, in an event of a fault state, the handle is movable into a “TRIP” position arranged between the “ON” position and the “OFF” position via the actuating device; and
a safety lock, coupled to the handle and couplable to the actuating device such that, in the event of a locking state, the locking state being a fault state, in which the at least one stationary contact and the at least one movable contact of the contact system are not separated, the handle is prevented from moving from the “TRIP” position into the “OFF” position by the safety lock, via the coupling to the actuating device, wherein the actuating device includes a knee lever and the safety lock includes a locking bolt, wherein the knee lever is movably mounted, and wherein the locking bolt is mechanically operatively connected to the handle of the contact system and, in the event of a locking state, is operatively connected to the knee lever such that movement of the handle from the “TRIP” position to the “OFF” position is prevented, wherein, in the event of a locking state, the locking bolt makes contact with a first region of the knee lever, wherein, in the event of a trip state, the locking bolt makes contact with a second region of the knee lever.