Multipole excess current switch

Details Multipole excess current switch Multipole excess current switch

1976-02-10

1977-05-17

Beha, Jr., William H.

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

With bimetallic elements

337 50, H01H 7330

Patent

active

040244873

ABSTRACT:
A multipole excess current switch composed of a plurality of single pole excess current switches each arranged to be placed in series in a respective circuit to be protected, each single pole switch including a U-shaped bimetallic member connected to conduct the current through such circuit and to undergo a change in shape when conducting an excess current, and a spring loaded switching arrangement arranged to open the switch in response to movement of the bimetallic member, and the switching arrangements of all of the single pole switches being mechanically connected to trigger operation of the spring loaded switching arrangements of the other single pole switches when one of the switches opens in response to an excess current through its associated circuit. Advantageously, the U-shaped bimetallic member is composed of a plurality of bimetallic strips disposed adjacent one another, but separated from one another by insulating material, with each strip being provided with a slot that divides it into two legs and the strips being interconnected to place all of the legs of the several strips in series, thereby establishing a high resistance path that makes the bimetallic member responsive to low current levels.

REFERENCES:
patent: 2813168 (1957-11-01), Mascioli et al.
patent: 3023288 (1962-02-01), Bodenschatz et al.
patent: 3486150 (1969-12-01), Clarke
patent: 3706057 (1972-12-01), Ellenberger

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