Over-current protective apparatus for a power circuit

Details Over-current protective apparatus for a power circuit Over-current protective apparatus for a power circuit

H - Electricity

02

H

318/86

H02H 7/085 (2006.01) H02H 1/00 (2006.01) H02H 3/04 (2006.01)

Patent

CA 1071301

OVER-CURRENT PROTECTIVE APPARATUS FOR A POWER CIRCUIT Abstract of the Disclosure A solid state relay structure for use with different alter- nating current motors having a range of full load current ratings and service factor ratings. The relay includes a rec- tangular housing and bores extending through the housing through which conductors to the motor are passed. The rear end of the housing is spaced from the panel on which the relay is mounted so the conductors may be looped through the bores when portions of the looped conductors are passed in the space between the rear end of the relay and the panel. The solid state components of the relay are encapsulated in the interior of the housing and are connected to switches, terminals, and a light emitting diode located at the front end of the housing. The switches are provided so the circuits within the relay may be pro- grammed for use with motors having different overload current and service factor ratings, to operate in a manual or automatic reset mode of operation and be readily reset when the relay is programmed to operate in the manual reset mode. One of the -switches acts as a test switch and causes the relay to trip independently of the current to the motor. The relay, when tripped, will cause the diode to visually indicate that the re- lay has tripped. The terminals and operating and test instruc- tions also located at the front end of the relay provide a con- venient arrangement for wiring the relay in its control circuit and provide the information required to program the relay for the characteristics of the motor it is to protect and the se- quence of steps to be taken to test the operability of the relay.

270881

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