Switch mechanism
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United States of America Patent
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-
May 14, 1996
Issued Date -
N/A
app pub date -
Feb 28, 1994
filing date -
Jul 22, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A switch mechanism opens a contact set in the event of an electrical fault condition. The mechanism involves a contact lever biased by a spring for pivoting about one or other of two fulcrums to open or close the contacts respectively. The fault condition results in an out of balance current flow which causes a solenoid to release a plunger initiating operation about a fixed fulcrum to open the contacts. A reset device is used manually to initiate operation about a movable fulcrum to reclose the contact set, provided the fault condition has been removed. An arm is deflected by the plunger to shift the movable fulcrum and also acts to restore the plunger as the mechanism is tripped. The switch mechanism may be incorporated in a residual current device (ground fault circuit interrupter) which provides a detection circuit to trip the mechanism.
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