Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Automatic circuit-interrupting devices
Patent
1976-09-15
1978-03-21
Harris, George
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Automatic circuit-interrupting devices
335 45, H01H 7512
Patent
active
040805824
ABSTRACT:
A single-pole circuit breaker or a plural-pole circuit breaker of the type having a common trip bar extending between poles whereby any pole tripping acts therethrough to trip the other pole or poles. The breaker is provided with an improved trip mechanism comprising a subassembly for each pole wherein all of the thermal and magnetic trip elements are mounted on a breaker terminal plate that acts as a base therefor and which is secured to the breaker housing. This trip mechanism also comprises shunt contacts mounted on the armature and bimetal for closing a protective shunt across the bimetal on magnetic trip and for rocking action on shunt contacts due to bimetal movement to break any welds therebetween; a field test mechanism having a spring-biased rotary trip member accessible from the outside and an eccentric lever attached thereto for manually tripping the breaker for test purposes; and an insulator lining the lower surface of the contact finger to prevent the arc from re-striking below the contact when the contacts trip open thereby to enhance completion of the tripping action.
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Autio William A.
Cutler-Hammer, Inc.
Harris George
Rather Hugh R.
Taken Michael E.
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