Trip device for an electric switch

Details Trip device for an electric switch Trip device for an electric switch

1990-10-29

1992-11-24

Picard, Leo P.

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

With magneto-mechanical motive device

335176, H01F 312, H01F 708, H01H 900

Patent

active

051666537

ABSTRACT:
An improved trip device for an electric switch comprises a yoke, a permanent magnet immovably positioned with respect to the yoke and a movably supported armature forming a first magnetic circuit, in which the armature is able to assume a first position under the influence of the magnetic field of the permanent magnet. A magnet winding and spring are provided for causing the armature to assume a second position in response to the magnetic field generated by an electric current, flowing during operation in the magnet winding. For adjusting the threshold value at which the armature is moved to its second position, a second magnetic circuit in the form of shunt interacting with the yoke and the permanent magnet is provided. The magnetically effective surface area of the shunt is smaller in the vicinity of the section thereof which interacts with the yoke than in the vicinity of the section which interacts with the permanent magnet.

REFERENCES:
patent: 3753178 (1973-08-01), Kato
patent: 3755766 (1973-08-01), Read, Jr.
patent: 3797773 (1974-03-01), Berry
patent: 4072918 (1978-02-01), Read, Jr.
patent: 5010310 (1991-04-01), Frielinghaus

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