Thermal-type over load relay

Details Thermal-type over load relay Thermal-type over load relay

1985-06-06

1987-01-06

Broome, Harold

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

With bimetallic elements

337 42, 337 56, H01H 6100, H01H 7116

Patent

active

046350209

ABSTRACT:
A thermal-type over load relay having an improved contact operating mechanism whereby testing of the operation of the relay is made easy, malfunctions due to mechanical shock or the like are substantially eliminated, and the overall size of the relay is reduced. A thermal element is provided for opening normally closed contacts of the relay in response to heat produced by a heater through which a main circuit current flows. An operating rod is provided for closing the normally open contacts in response to the operation of a normally closed contact mechanism when the normally closed contacts are opened by the operation of the thermal element. The operating rod may be operated from the exterior of the housing of the relay for testing purposes.

REFERENCES:
patent: 3638158 (1972-01-01), Thorne

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