Overload protector

Details Overload protector Overload protector

1995-02-06

1997-05-06

Donovan, Lincoln

Electricity: electrothermally or thermally actuated switches

Thermally actuated switches

337307, H01H 3700

Patent

active

056275064

ABSTRACT:
An overcurrent protection device for a load 24 having a housing 100 with fixed contacts 108, 110, movable contacts 118, 120 and terminals 102, 104 for electrical connection to the load. A first snap acting bimetallic 116 member in the device is responsive to heat from overcurrent conditions at a first snap temperature and a second snap acting bimetallic member 12 is responsive to heat at a second higher temperature in the event of failure in operation of the first bimetallic member. The first bimetallic member 116 controls the movement of the movable contacts 118, 120 to cause engagement and nonengagement with the stationary contacts 108, 110, and the second snap acting bimetallic member 12 controls electrical connection between the fixed contact 102 and terminal 108, and is not resetable upon breaking the electrical connection. Additionally, a heat conductive member 20 of high heat conductivity is provided that directly provides superior heat conductivity between the load 24 and the first bimetal member 116 so that the bimetal more accurately reflects the temperature of the load.

REFERENCES:
patent: 4472705 (1984-09-01), Carlson
patent: 4724414 (1988-02-01), Kurz

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