Electricity: electrical systems and devices – Safety and protection of systems and devices – Ground fault protection
Reexamination Certificate
2006-04-25
2006-04-25
Sircus, Brian (Department: 2836)
Electricity: electrical systems and devices
Safety and protection of systems and devices
Ground fault protection
C361S043000
Reexamination Certificate
active
07035067
ABSTRACT:
The continuity of the coil of the actuating solenoid of an electric power switch is detected through utilization of a signaling device, such as a light emitting diode (LED) that monitors energization of a dc power supply fed from the source side of the coil. A circuit energized from the other side of the coil generates a dc voltage V2that is applied to the gate electrode of an electronic switch shunting the LED. The voltage V2is greater than the dc supply voltage to bias the electronic switch off so that the LED is illuminated when there is continuity through the coil. If the coil fails, V2will be zero and the electronic switch is turned on to short circuit the LED to signal the failure of the coil.
REFERENCES:
patent: 4479117 (1984-10-01), Marquardt
patent: 4764884 (1988-08-01), Noyori
patent: 6052266 (2000-04-01), Aromin
patent: 6590753 (2003-07-01), Finlay
patent: 6873153 (2005-03-01), Frydman
patent: 2003/0058588 (2003-03-01), Butcher et al.
Schmalz Steven C.
Walz Michael F.
Eaton Corporation
Union Marvin L.
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