Circuit breaker comprising parallel connected sections

Details Circuit breaker comprising parallel connected sections Circuit breaker comprising parallel connected sections

H - Electricity

01

H

306/56

H01H 73/22 (2006.01) H01H 71/08 (2006.01) H01H 71/10 (2006.01) H01H 73/38 (2006.01)

Patent

CA 1211143

Abstract: A circuit breaker comprising parallel connected sections A circuit breaker (10) comprising two or more sections (12, 14 and 16) connected in parallel with each other. Each section (12, 14 or 16) of the circuit breaker comprises an electromagnetic sensing device (50, 50a or 50b) and a pair of relatively movable contacts (34,38; 34a,38a; or 34b,38b). The electromagnetic sensing devices (50, 50a or 50b) are electrically connected at one of their ends to the load terminals (54, 54a or 54b). The load terminals (54, 54a or 54b)are electrically connected in parallel with each other by a bar (49). The electromagnetic sensing devices (50, 50a and 50b) are electrically connected at their other ends to each other and are also electrically connected to all of the movable arms (36, 36a and 36b) which support the movable contacts (34, 34a and 34b). The movable contacts (34, 34a and 34b) are engageable with stationary contacts (38, 38a and 38b) carried by line terminals (40, 40a and 40b) which are themselves all electrically connected in parallel with each other by a bar (47). Thus, the electromagnetic sensing devices (50, 50a and 50b) are connected in parallel at both of their electrical ends and the relatively movable contacts (34,38; 34a,38a and 34b,38b) are also connected in parallel at both of their electrical ends while the electromagnetic sensing devices (50, 50a and 50b) on the one hand, and the relatively movable contacts (34,38; 34a,38a; and 34b,38b) on the other hand, are also in series with each other, whereby the current is divided equally among all of the electromagnetic sensing devices (50, 50a and 50b) even though the current may not be equally divided among all of the relatively movable contacts (34,38; 34a,38a; and 34b,38b) because of varying contact resistances.

447177

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