Circuit breaker magnetic trip device

Details Circuit breaker magnetic trip device Circuit breaker magnetic trip device

1978-07-03

1981-01-13

Braun, Fred L.

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Tripping means

335229, H01H 900, H01F 700

Patent

active

042452040

ABSTRACT:
A magnetic trip unit for a circuit breaker having an armature and a plunger; the armature completes a magnetic path through the poles of a permanent magnet; the armature and plunger are biased toward trip position but are held by the permanent magnet and may be restored to the position where the armature completes the path through the poles of the permanent magnet. A trip coil is provided surrounding the permanent magnet and armature. A casing of magnetic material surrounds the trip coil and extends below the armature; this casing also has top and bottom walls of magnetic material and an inner cup shaped sleeve bearing against the bottom wall and against one pole of the permanent magnet. Energization of the trip coil establishes an additional magnetic path through the armature and the one pole of the permanent magnet which opposes the magnetic force of the first mentioned magnetic path and permits the bias on the armature and plunger to move them to trip position.

REFERENCES:
patent: 2663775 (1953-12-01), MacNeill et al.
patent: 2669623 (1954-02-01), MacNeill et al.
patent: 2840663 (1958-06-01), Horn
patent: 3699486 (1972-10-01), DeLucia
patent: 4072918 (1978-02-01), Read

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