Circuit protector

Details Circuit protector Circuit protector

1985-12-30

1987-06-09

Broome, Harold

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Latching means

335234, 335179, 335183, H01H 920

Patent

active

046723439

ABSTRACT:
A circuit protector for protecting a circuit from an overcurrent including a U-shaped main yoke, a main permanent magnet arranged between legs of the U-shaped yoke, a main coil wound around the main yoke, a movable member made of magnetic material and arranged at an open end of the U-shaped yoke, a magnetic device for generating a magnetic force for moving the movable member in a direction away from the yoke, a movable contact secured to the movable member and a fixed contact provided in opposition to the movable. The coil and the movable and fixed contacts are connected in series with a circuit to be protected across a D.C. power supply source. When an overcurrent flows through the coil, the coil generates a magnetic flux having an opposite direction to that of a magnetic flux induced by the permanent magnet, so that a magnetic force for attracting the movable member to the yoke is decreased. As a result, the movable member is separated from the yoke by the increasing magnetic force generated by the magnetic device and the movable contact is separated from the fixed contact to disconnect the circuit from the D.C. power supply source.

REFERENCES:
patent: 3514674 (1970-05-01), Toshio et al.
patent: 4251789 (1981-02-01), Russell et al.
patent: 4467304 (1984-08-01), Reisem

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