Rating plug for molded case circuit breaker

Details Rating plug for molded case circuit breaker Rating plug for molded case circuit breaker

1986-04-28

1987-03-10

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361413, H02H 305

Patent

active

046494553

ABSTRACT:
A removable rating plug connectable with electronic trip molded case circuit breakers allows a common rating plug design to be used over a wide range of industrial rated circuit breakers. The burden resistors carried by the rating plug set the breaker ampere rating in combination with a current transformer tap selection. Electrical connection is made between the rating plug and the trip unit circuit board by a plurality of conductive stabs attached to the plug for insertion within spring connectors arranged on the circuit board. The stabs are keyed to ensure electrical connection with reference ground before, during, and after electrical connection is made with the rating plug burden resistors to protect the current sensing transformers from dangerous overvoltage conditions. Additionally, trip test facility and rating plug integrity indication are provided by test connectors on the rating plug in combination with test circuit implementation on the trip unit circuit board.

REFERENCES:
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patent: 3340440 (1967-09-01), Minter
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patent: 4514786 (1985-04-01), Charruau
U.S. patent application Ser. No. 631,708, filed Jul. 17, 1984, John Dougherty, "Digital I.sup.2 T Pickup, Time Bands and Timing Control Circuits for Static Trip Circuit Breakers".
U.S. patent application Ser. No. 760,224, filed Jul. 29, 1985, Graham A. Scott et al., "Electronic Circuit Breaker Trip Function Adjusting Circuit".

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