Current limiting circuit breaker with improved magnetic drive de

Details Current limiting circuit breaker with improved magnetic drive de Current limiting circuit breaker with improved magnetic drive de

1977-09-06

1979-01-02

Harris, George

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Automatic circuit-interrupting devices

335195, H01H 7710

Patent

active

041329686

ABSTRACT:
A current limiting circuit breaker comprises an improved slot motor magnetic drive device. The threshold level of overload current which produces current limiting action is raised, yet the degree of current limiting action during high overload currents is maintained by placing a thin saturable magnetic steel plate across the open end of the slot motor magnetic drive device. During overcurrent conditions below the threshold value, the plate shunts most of the magnetic flux and prevents production of magnetodynamic force upon the contact arm. Above the threshold level, the overcurrent generates magnetic flux sufficient to saturate the plate and forces additional flux into the air gap where the flux interacts with the contact arm to drive the contact arm into the slot and produce current limiting action in a normal manner.

REFERENCES:
patent: 3991391 (1976-11-01), Wafer
patent: 4039983 (1977-08-01), Tenracol et al.
patent: 4071836 (1978-01-01), Cook et al.

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