Overcurrent protector with overheat prevention means

Details Overcurrent protector with overheat prevention means Overcurrent protector with overheat prevention means

1994-06-20

1996-05-07

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Circuit interruption by thermal sensing

361 24, 361 26, 361 32, H01H 3700

Patent

active

055152295

ABSTRACT:
An overcurrent protection device for a motor M with an overheat prevention function having a housing 10 with fixed contacts 16, 18 and movable contacts 24, 26. A first snap acting bimetallic element 20 in the device is responsive to heat from overcurrent conditions and a second snap acting bimetallic element 40 is responsive to heat from the temperature for the motor M. The movable contacts 24, 26 are controlled by the first bimetallic element to cause engagement or nonengagement with the stationary contacts 16,18. Coupling members 42, 44 contained in the housing engage both bimetallic elements 20, 40 and allow the first overcurrent bimetallic element 20 to snap independently of the second bimetallic element 40 while providing for snap action of the second bimetallic element 40 to also cause the first bimetallic 20 to snap.

REFERENCES:
patent: 4563667 (1986-01-01), Hofsass
patent: 4633210 (1986-12-01), Mallonen

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