Piezoelectrically actuated ground fault interrupter circuit apparatus
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United States of America Patent
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Jan 19, 1999
Grant Date -
N/A
app pub date -
Mar 7, 1997
filing date -
Mar 7, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A ground fault interrupter circuit ('GFIC') device having as a switching device a flextensional electroactive transducer which, when energized, opens a supply conductor between a current source and a load. When a fault current is detected a voltage is induced in a coil; due to the condition that there is less current running through the conductor from the load than through the conductor from the power supply which both extend through the core of the coil. The voltage induced in the coil is amplified by a transistor which causes the transducer to piezoelectrically 'snap' from a first neutral position to a second neutral position thereby cutting of current from the power supply to the load.
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