Circuit breaker with moving magnetic core for low current magnet

Details Circuit breaker with moving magnetic core for low current magnet Circuit breaker with moving magnetic core for low current magnet

1989-10-05

1990-08-21

Picard, Leo P.

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Automatic circuit-interrupting devices

335 42, H01M 7510

Patent

active

049510150

ABSTRACT:
A circuit breaker is disclosed having a movable magnetic core provided in the magnetic trip assembly thereof adapted to lower the current levels at which the magnetic trip mechanism will operate. The magnetic trip assembly also includes a pivotally connected armature, a current carrying conductor, a fixed magnetic yoke and a latchable operating mechanism. A primary air gap exists between the armature and the fixed yoke. The movable core is designed to move into an extended position which reduces the primary air gap which in turn increases magnetic flux coupling which allows the magnetic force required for the armature to pivotally rotate to unlatch the operating mechanism and thereby trip the circuit breaker to be generated at a lower current level. This reduction in current is the desired effect of the new design.

REFERENCES:
patent: 3815059 (1974-06-01), Spoelman
patent: 4719438 (1988-01-01), Mrenna et al.

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