Thermal limiter

Details Thermal limiter Thermal limiter

1975-05-23

1977-04-05

Miller, J D

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

Fusible element actuated

337163, 337265, H01H 8130

Patent

active

040165213

ABSTRACT:
A thermal limiter assembly for controlling an electrical circuit in response to the existence of a sensed condition beyond a predetermined time period. A housing body of the assembly includes a gas-filled cavity in which are disposed functional electrical elements in the form of a heater element and a thermally responsive switch or fuselike element. The heater element is arranged to raise the temperature of the thermally responsive element to a critical temperature at which it changes its state of conductivity and is thereby adapted to alter an external circuit connected to it. As disclosed, the heat transfer relationship between the heater element and the thermally responsive element is relatively independent of environmental temperature conditions so that the time period to actuate the thermally responsive element is not substantially affected by such temperature conditions. The housing body includes means to indicate the state of conductivity of the thermally responsive device in a visually perceptible manner externally of said housing.

REFERENCES:
patent: 891414 (1908-06-01), Ernst
patent: 1450670 (1923-04-01), La Mao
patent: 1650996 (1927-11-01), McDonnell
patent: 3180958 (1965-04-01), Merrill
patent: 3649942 (1972-03-01), Plasko

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