Patent ID: 8674795
Filing Date: 2014-03-18
Classification: H01F,H01H,Y10T

Abstract:
1. A magnetic actuator unit for a circuit breaker, comprising: a core; a coil; an actuating shaft; a first movable plate; a second movable plate; two permanent magnets; and a non-magnetic flat insert arranged between the core and the second movable plate, wherein the first movable plate is configured to be attracted by the core to a first position at a first side of the core when a magnetic field is generated by the coil, and to switch the circuit breaker to an ON position when being attracted by the core, wherein the first movable plate and the second movable plate are spaced apart from one another in a fixed position at a distance, such that when the first movable plate lifts off from the core with a stroke of the magnetic actuator unit to an OFF position, the second movable plate is configured to bear against the non-magnetic flat insert at a second position at a second side of the core opposite of the first position to generate a holding force of the magnetic actuator unit at the OFF position, and wherein the non-magnetic flat insert and the second movable plate are configured to adjust a holding force of the magnetic actuator unit provided by the second movable plate and sufficient for holding the second movable plate at the OFF position against forces that are acting from outside the magnetic actuator unit to the magnetic actuator unit, wherein the magnetic actuator unit comprises a fixing device configured to fix the non-magnetic flat insert to the core, and wherein the non-magnetic flat insert is bended at opposite ends and fixed to the core by at least one screw comprised in the fixing device.