Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Automatic circuit-interrupting devices
Patent
1975-08-22
1977-06-21
Broome, Harold
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Automatic circuit-interrupting devices
335147, 335196, H01H 7710
Patent
active
040314928
ABSTRACT:
A current limiter providing for a rapid triple series break in the protected circuit. Two movable contact arms are electromagnetically driven apart by two electromagnetic or slot motor drives for rapid circuit interruption when current through the current limiter exceeds a predetermined value. This provides twice the rate of contact separation than that which can be obtained from a single contact arm and consequently increases the rate of arc voltage rise and reduces peak let through current. The magnetic drive devices are formed from a ferromagnetic material and have a narrow slot formed therein, which is magnetically open on one end. Each contact arm is disposed in the slot of an associated magnetic drive device near the open end thereof. Each movable contact arm has a pair of spaced apart contacts mounted thereon. One of these contacts engages a stationary contact and the other contact engages a mating contact on the opposing movable contact arm when the current limiter is closed. Each movable contact arm is biased to the closed position by a magnetic latch. Under high overload conditions the force tending to separate the movable contact arms is large and the magnetic latch mechanisms release and the slot motors rapidly open the circuit interrupter. U-shaped plates are provided in the vicinity of contact separation to facilitate arc extinction.
REFERENCES:
patent: 3813619 (1974-05-01), Koval
Broome Harold
Converse, Jr. R. E.
Westinghouse Electric Corporation
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