Circuit breaker having solid state and thermal-magnetic trip mea

Details Circuit breaker having solid state and thermal-magnetic trip mea Circuit breaker having solid state and thermal-magnetic trip mea

1976-04-12

1978-05-16

Broome, Harold

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Automatic circuit-interrupting devices

335 35, H01H 7500, H01H 7700, H01H 8300

Patent

active

040901564

ABSTRACT:
A molded case multi-pole circuit breaker is provided with a solid state trip unit constructed to automatically open the breaker responsive to predetermined fault current conditions by actuating a permanent magnet latch. The circuit breaker is also provided with a thermal-magnetic trip means that acts independently of the solid state trip unit to automatically open the breaker responsive to predetermined fault current conditions.

REFERENCES:
patent: 3539867 (1970-11-01), Edmunds
patent: 3558991 (1971-01-01), Brandt, Jr. et al.
patent: 3636482 (1972-01-01), Edmunds
patent: 3826951 (1974-07-01), Mater et al.

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