Electrical protection circuits

Details Electrical protection circuits Electrical protection circuits

H - Electricity

02

H

317/11

H02H 3/08 (2006.01) H02H 1/00 (2006.01)

Patent

CA 1087677

ABSTRACT OF THE DISCLOSURE A circuit arrangement is disclosed for protecting against overload electrical equipment such as an electric motor, and any mechanical equipment driven thereby, such as a power actuator. Two light emitting diodes are connected in parallel with each other (with opposite polarity) and in parallel with a series impedance in the power supply circuit of the motor. so that each produces a light output in response to an overload current of appropriate polarity in the motor. Associated with each diode is a respective phototransistor which responds to the light output from the associated diode and, via a respective control circut, operates a switch to interrupt the load current. - 1 -

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