Resettable ground fault circuit interrupter
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United States of America Patent
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Jan 9, 1990
Issued Date -
N/A
app pub date -
Mar 22, 1989
filing date -
Oct 21, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A resettable circuit interrupter in a ground fault detector circuit utilizes a housing which slideably retains a solenoid coil wound on a bobbin. A contact carrier is attached to the bobbin and one or more moveable contacts are provided on the carrier opposite a corresponding set of fixed contacts. A plunger slides through a central passageway in the solenoid coil. The bobbin is spring biased so that the contacts are in a normally open position. In a manually resettable version, when the solenoid coil conducts a predetermined current, manually activating the plunger causes the plunger to magnetically couple to a footplate attached to the bobbin. When a plunger spring returns the plunger to its original position, the bobbin and contact carrier move with it and the contacts are closed. When the solenoid coil conducts insufficient current to magnetically couple the plunger and footplate, the bias springs maintain the contacts in the normally open position. In an electrically resettable version the contacts may be reset by electromagnetic energy alone, without manual activation of the plunger.
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