Patent ID: 8907751
Filing Date: 2014-12-09
Classification: H01H

Abstract:
1. A power circuit breaker, in which an electronic trip unit (ETU) is configured to monitor an electric current in order to detect an electrical fault, comprising: a first magnetic device configured to be excited in the event of a fault being detected, and when excited, configured to trip a trip mechanism via a plunger, the trip mechanism being configured to, when tripped, disconnect two contacts of the power circuit breaker via which the current flows; a second magnetic device, configured to be excitable by the ETU, the second magnetic device being further configured to trip the trip mechanism, the first and second magnetic devices being movable into a test position and the one of the first and second magnetic devices which is in the test position is able to be excited by the ETU without said one magnetic device tripping the trip mechanism as a result; and a testing device, facing the second magnetic device, configured to generate a test signal in the event of a plunger of one of the first and second magnetic devices being detected by a sensor element of the testing device.