Field test unit for circuit breaker

Details Field test unit for circuit breaker Field test unit for circuit breaker

1989-03-08

1993-12-21

Wieder, Kenneth A.

Electricity: measuring and testing

Electromechanical switching device

Circuit breaker

340638, G01R 3102

Patent

active

052724387

ABSTRACT:
A portable field tester for a circuit breaker having an electronic trip unit includes a ribbon cable having a connector plug for making connection to a restraint plug socket of the trip unit. The tester has a parallel connector in which the breaker rating plug may be inserted. A battery source is included and a battery fail LED is illuminated if the source voltage falls below a certain level. A voltage regulator and a plurality of voltage dividers develop reference test voltages for application to the breaker trip unit via the connectors and cable. Switches selectively disable a ground fault test circuit in the breaker during primary injection testing. A pair of resistors are connected via the cable and connectors for rapidly discharging the breaker memory circuits after each test.

REFERENCES:
patent: 4004201 (1977-01-01), DePuy
patent: 4105965 (1978-08-01), Russell
patent: 4611174 (1986-09-01), Arnoux et al.
patent: 4814712 (1989-03-01), Burton et al.
patent: 4870532 (1989-09-01), Beatty, Jr. et al.
patent: 4983955 (1991-01-01), Ham, Jr. et al.

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