Patent ID: 7035067
Filing Date: 2006-04-25
Classification: G01R,H02H

Abstract:
1. An apparatus for detecting failure of an actuating solenoid coil of an electric power switch where the actuating solenoid coil is energized by a power source connected to a first terminal of the actuating solenoid coil through a power switch connected in series with the power source and a second terminal of the actuating solenoid coil, the apparatus comprising: a first circuit connected to the first terminal of the actuating solenoid coil and comprising a signaling device and a shunt switch shunting the signaling device, the signaling device being energized with the shunt switch turned off and being shorted with the shunt switch turned on; and a second circuit connected to the second terminal of the actuating solenoid coil, the second circuit being energized through the actuating solenoid coil to turn the shunt switch off with continuity through the actuating solenoid coil, and being deenergized to turn the shunt switch on with loss of continuity through the actuating solenoid coil.