Bimetal overload relay

Details Bimetal overload relay Bimetal overload relay

1976-08-19

1978-01-17

Pellinen, A. D.

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

With bimetallic elements

337 78, 337102, H01H 6102

Patent

active

040694640

ABSTRACT:
A U-shaped heater unit is surrounded by a U-shaped bimetal, the legs of which move in response to temperature variations. The motion of the bimetal is conveyed through a wall by a slidable pin which acts to rotate an L-shaped compensator element. This rotation lifts a link element which operates a switch when the trip point is reached. A reset mechanism includes a plunger which when manually depressed rotates a reset arm first in one direction to reset the switch after it has been tripped and then in the opposite direction to a neutral station in which it will not reset the switch. The reset mechanism thus cannot be defeated by jamming the plunger in its fully depressed position.

REFERENCES:
patent: 3213243 (1965-10-01), Anderson et al.
patent: 3238335 (1966-03-01), Randolph et al.
patent: 3251966 (1966-05-01), Kussy et al.
patent: 3265831 (1966-08-01), Ramsey et al.
patent: 3423712 (1969-01-01), Howard

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