Integral magnetic trip and latch for a circuit interrupter

Details Integral magnetic trip and latch for a circuit interrupter Integral magnetic trip and latch for a circuit interrupter

H - Electricity

01

H

306/57

H01H 71/40 (2006.01)

Patent

CA 1055084

ABSTRACT OF THE DISCLOSURE A circuit interrupter having a magnetic trip ele- ment which is integral with the latch. The disclosed cir- cuit interrupter is provided with a bimetal and a magnetic trip element directly connected to the latch of the circuit interrupter which is drawn towards the bimetal, unlatching the circuit interrupter when current flow therethrough exceeds a high overload level. The disclosed circuit inter- rupter is particularly adaptable for use on a distribution transformer. A movable bridging contact for completing a series circuit between two stationary contacts is provided. The movable bridging contact is spring biased towards an open position separated from the stationary contacts, but with the circuit interrupter in the normally closed position is held in engagement with the stationary contacts by a latching mechanism which is responsive to the bimetal or magnetic trip element to allow the circuit breaker to trip open during overload conditions. The magnetic trip element is formed integral with the latching mechanism to reduce time delay before operation. A plurality of poles are operated using only one operating mechanism by connecting the elongated operating arms with a strong metallic member for simultaneous operation of all poles. The bridging contact is disposed near the end of an elongated operating arm which is linked to the circuit breaker operating mechanism. Each pole of the circuit interrupter is provided with a bimetallic trip element. The magnetic trip element can be formed from a single piece having a plurality of legs each -1- disposed in proximity with the bimetal of one pole. -2-

259091

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