Solid state overload relay circuit

Details Solid state overload relay circuit Solid state overload relay circuit

H - Electricity

02

P

348/26, 318/86

H02P 3/00 (2006.01)

Patent

CA 1070754

SOLID STATE OVERLOAD RELAY CIRCUIT Abstract of the Disclosure A self-powered solid state overload relay circuit having current transformers energized by conductors supplying current to a multiphase alternating current motor. The transformers have secondary windings connected to charge a capacitor with a voltage indicative of the magnitude of the maximum current in the motor windings. The circuit includes presetable imped- ance circuits which permit the circuit to be easily programmed to respond to a range of abnormal motor currents in the wind- ing in motors of varying size and service factor ratings, components which are arranged to duplicate the operation of melting alloy and bimetal type overload relays in an automatic or in a trip-free manual reset mode, a light emitting device which visually indicates when the relay is in a tripped state, and components which cause the relay to be insensitive to ambient temperature variations.

271014

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