Replaceable solid state trip unit

Details Replaceable solid state trip unit Replaceable solid state trip unit

1976-03-29

1977-07-19

Broome, Harold

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Automatic circuit-interrupting devices

335 18, 335132, 335172, 361206, 361115, H01H 7300, H02H 308

Patent

active

040371832

ABSTRACT:
A molded case multi-pole circuit breaker is provided with a removable and replaceable solid state trip unit constructed with all fault current detecting elements within a common housing. For each circuit breaker pole the trip unit includes an input and an output transformer feeding circuitry mounted on a board disposed within the common housing. The circuitry output is connected to operate a permanent magnet latch for release of a mechanical latch that normally holds the contact operating mechanism in a reset position.

REFERENCES:
patent: 3723818 (1973-03-01), Zocholl
patent: 3761778 (1973-09-01), Willard
patent: 3783423 (1974-01-01), Mater et al.
patent: 3826951 (1974-07-01), Mater et al.

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