Patent ID: 6376788
Filing Date: 2002-04-23
Classification: H01H

Abstract:
An electromagnetic blow-open device for a pole of a circuit breaker, said pole having a stationary contact and a movable contact having contact fingers mounted on a contact carrier, said contacts having an open position and a closed position, said pole further having an associated rotatable pole shaft, said electromagnetic blow-open device comprising:a collapsible linkage having a rigid position and a changeable position; said collapsible linkage disposed between, and coupled to, said pole shaft and said contact carrier; said collapsible linkage maintaining said stationary contact and said movable contact in said closed position while said collapsible linkage is in said rigid position and to allow said stationary contact and movable contact to move to said open position when said collapsible linkage is in said changeable position; an actuator arm coupled to said collapsible linkage and responsive to an over-current condition in said pole; said actuator arm structured to shift said collapsible linkage from said rigid position to said changeable position.