Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Automatic circuit-interrupting devices
Patent
1990-08-30
1992-06-02
Broome, Harold
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Automatic circuit-interrupting devices
335 21, H01H 7702
Patent
active
051190540
ABSTRACT:
A molded case circuit breaker is provided with a magnetic trip unit which includes an armature assembly and a multi-turn magnetic coil assembly. The magnetic coil assembly is formed to occupy substantially the same volume as a single-turn magnetic coil. The added turns in the magnetic coil increase the attraction force on the armature to essentially lower the electric current value at which the magnetic unit trips the circuit breaker. By utilizing a multi-turn magnetic coil assembly which occupies the same space as the single-turn magnetic coil, the same frame size can be used for both single-turn magnetic coils, and multi-turn magnetic coils without the need to locate the thermal unit outside of the molded case circuit breaker.
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Grunert Kurt A.
Hapeman Lawrence M.
Wafer John A.
Wehrli, III Henry A.
Broome Harold
Donovan Lincoln
Moran M. J.
Westinghouse Electric Corp.
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