Directly heated bimetallic strip for use in a thermal trip

Details Directly heated bimetallic strip for use in a thermal trip Directly heated bimetallic strip for use in a thermal trip

1975-09-26

1976-12-28

Harris, George

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

With bimetallic elements

337111, H01H 6101, H01H 7116

Patent

active

040004848

ABSTRACT:
A directly heatable bimetallic strip which can be disposed to carry the load current through a thermal trip.
The bimetallic strip comprises an elongate member having first and second end portions and an intermediate portion. The intermediate portion comprises three or more odd number of parallel arms extending substantially longitudinally of the strip. The arms are connected in meanderline fashion with one arm connected to the first end portion and another arm connected to the second end portion and the junctions of the arms being spaced from the first and second end portions. Two connecting pieces of an insulating material are provided. One connecting piece rigidly joins together the first end portion, the arm connected thereto and the junction or junctions adjacent to, but spaced from, the first end portion, and the other connecting piece rigidly joins together the second end portion, the arm connected thereto and the junction adjacent to, but spaced from, the second end portion.
The present invention also relates to a thermal trip including the bimetallic strip.

REFERENCES:
patent: 1509965 (1924-09-01), MacFarland
patent: 1886354 (1932-11-01), O'Keeffe
patent: 2289061 (1942-07-01), Mertler
patent: 2980779 (1961-04-01), Hickle et al.

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