Bimetal overload relay

Details Bimetal overload relay Bimetal overload relay

1977-11-11

1979-06-05

Harris, George

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

With bimetallic elements

337 66, H01H 7116

Patent

active

041575237

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: 2701829 (1955-02-01), Krieger
patent: 3267236 (1966-08-01), Walters et al.

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