Modular breaker with an auxiliary tripping block associated with a multipole breaker block

Claim 1

A modular circuit breaker with an auxiliary trip unit (12), notably a ground fault or shunt trip device, able to be adjoined and coupled to a multipole circuit breaker unit (10) having a plurality of juxtaposed poles, each pole of said circuit breaker unit (10) comprising separable contacts (18, 20) and a first actuating mechanism (22) of said contacts, controlled either manually by an operating handle (24) with two stable open and closed positions of the circuit breaker, or automatically by a main trip device cooperating with a trip bar (26) in the event of an overload or short-circuit, said auxiliary trip unit (12) housing an electromagnetic relay (45) associated with a second operating mechanism (46) comprising a second handle (54) for resetting the trip unit (12) and a first mechanical tripping link (48) capable of transmitting the tripping order from the relay (45) to the trip bar (26) by engagement of a finger (52) of the second mechanism (46) in an orifice (42) arranged in the insulating case (40) of the adjacent pole (16), characterized in that a control means of the first and second handle (24,54) comprises a ramp (64) arranged on the trip bar (26) of the main trip device, and that the finger (52) of the first mechanical tripping link (48) of the second mechanism (46) is capable of coming into engagement with said ramp (64) to bring about forced tripping of the circuit breaker unit (10) in the event of a disagreement between the handles (24,54), notably when a discharged trip unit (12) is associated with a closed circuit breaker unit (10), the movement of bringing the two units (10, 12) together being transformed into a pivoting movement of the trip bar (26) to the tripped position.