Direct fault tripping of circuit breaker having solid state trip

Details Direct fault tripping of circuit breaker having solid state trip Direct fault tripping of circuit breaker having solid state trip

1976-04-12

1978-08-01

Broome, Harold

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Automatic circuit-interrupting devices

335 38, 335174, H01H 7124, H01H 7300

Patent

active

041046013

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 latch and main conductors of the circuit breaker are constructed and arranged so that at very high short circuit currents, even if the solid state circuitry malfunctions, flux generated directly by current flow in the main conductors will buck the permanent magnet flux sufficiently to actuate the magnetic latch directly.

REFERENCES:
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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