Patent ID: 6714396
Filing Date: 2004-03-30
Classification: H01H,H02H

Abstract:
An undervoltage tripping device as an attachable module for a multipolar low-voltage switching device, the undervoltage tripping device comprising:an electromagnetic undervoltage tripping mechanism for effectuating a tripping of the multipolar low-voltage switching device given a drop below a predeterminable voltage limit value, said electromagnetic undervoltage tripping mechanism having a magnetic circuit with a spring-loaded armature and a trip coil including a number of winding portions corresponding to a number of phases of a multiphase power supply circuit; and a rectifier bridge powered by the multiphase power supply circuit and having a number of rectifier branches corresponding to the number of the phases of the multiphase power supply circuit, said rectifier bridge connected to said electromagnetic undervoltage tripping mechanism and said rectifier branches jointly power said electromagnetic undervoltage tripping mechanism, said electromagnetic undervoltage tripping mechanism effectuating an all-pole tripping of the multipolar low-voltage switching device given a failure of one of the phases of the multiphase power supply circuit, said rectifier bridge being a three-pulse bridge circuit, each of said winding portions of said electromagnetic undervoltage tripping mechanism disposed in one of said rectifier branches, the failure of at least one of the phases has an effect that a restoring force acting on said armature surpasses a holding power generated by said magnetic circuit.