Protective switch
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United States of America Patent
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N/A
Issued Date -
Jul 6, 2006
app pub date -
Nov 22, 2003
filing date -
Nov 27, 2002
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A protective circuit-breaker comprising includes an operating mechanism for closing and opening main contacts. An evaluation unit is provided for processing a measured value of the phase current, comparing the processed measured value to an adjustable fault criterion, and tripping the operating mechanism via a trip solenoid by outputting a trip signal when the fault criterion is exceeded. A measuring terminal is connected to the evaluation unit at an input side thereof and configured to supply a monitored electrical quantity supplied by a temperature-dependent resistor connected to a motor-driven system supplied via the protective circuit-breaker. The evaluation unit includes a measuring device for measuring a change in the monitored electrical quantity and for outputting a trip signal when the monitored electrical quantity exceeds a predefined limit.
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