Undervoltage tripping device
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United States of America Patent
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Mar 30, 2004
Grant Date -
Jul 18, 2002
app pub date -
Oct 29, 2001
filing date -
Apr 28, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An undervoltage tripping device for a multipolar low-voltage switching device is described. The tripping device contains an electromagnetic tripping mechanism for effectuating a tripping of the multipolar low-voltage switching device given a drop below a predeterminable voltage limit value. The tripping mechanism has 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. A rectifier bridge is powered by the multiphase power supply circuit. The rectifier bridge has a number of rectifier branches corresponding to the number of the phases of the multiphase power supply circuit. The rectifier bridge is connected to the tripping mechanism and the rectifier branches jointly power the tripping mechanism. The tripping mechanism effectuates an all-pole tripping of the low-voltage switching device given a failure of one of the phases of the multiphase power supply circuit.
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