Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Automatic circuit-interrupting devices
Patent
1987-07-30
1988-12-27
Macon, Robert S.
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Automatic circuit-interrupting devices
200144R, H01H 7500
Patent
active
047943572
ABSTRACT:
A multi-pole circuit interrupter having a first pole unit provided with an operating mechanism and a second pole unit provided with no operating mechanism for interrupting current flowing therethrough by separating a movable contact from a stationary contact as a result of an electromagnetic repulsive force generated upon occurrence of a large overcurrent irresepective of the automatic trip operation of an operating mechanism. Each of the pole units of the circuit interrupter comprises a contact arm assembly for supporting the movable contact including a first contact arm and a second contact arm pivotally supported by a common pivot pin. The first contact arm in the first pole unit has an elongated guide hole extending in a direction of movement of the movable contact and is directly connected to the operating mechanism. The first contact arm in the second pole unit is connected to the operating mechanism through a cross bar. The second contact arm has an elongated hole extending substantially in a direction of extension thereof. A spring-biased sliding pin extends through the elongated hole and the guide hole, and a stopper is mounted to a base of the second pole unit for limiting movement of the second contact arm beyond a predetermined position.
REFERENCES:
patent: 3492609 (1970-01-01), Murai et al.
patent: 4227161 (1980-10-01), Yamat et al.
patent: 4626811 (1986-12-01), McKee et al.
Fujihisa Hiroaki
Murata Shiroo
Toda Haruhisa
Macon Robert S.
Mitsubishi Denki & Kabushiki Kaisha
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