Tripping device for control mechanism of electric circuit breaker, has movable actuator including magnetic region with two magnetic attracting surfaces creating driving force of attraction to move actuator in direction of magnetic yoke

摘要

The device (34) has a magnetic circuit equipped with a movable actuator (40) having a magnetic region for interacting with a magnetic yoke (50) in a closed position to cause movement of an actuating plunger (48) causing tripping of a control mechanism (18) when an electrical current exceeds a threshold. The magnetic region includes two magnetic attracting surfaces (41, 42) acting independently from one another for creating a driving force of attraction to move the movable actuator in a direction of the magnetic yoke. An independent claim is also included for a circuit breaker.