Thermo-activating breaker

Details Thermo-activating breaker Thermo-activating breaker

1988-02-24

1989-07-25

Broome, H.

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

Fluorescent lamp-starting devices

337 88, 337104, H01H 6100, H01H 63013, H01H 7116

Patent

active

048518042

ABSTRACT:
A thermally actuated switch having a bi-metal switch arm carrying a contact, a cooperating contact, a heating resistor and a holding resistor. The switch is enclosed in a sealed housing and circuit connections extend from the switch contacts, heating resistor and holding resistor to the exterior of the housing. The heating position thereby closing or opening the switch contacts, depending on whether the contacts are normally-open or normally-closed. After switch actuation, the heating resistor continues to supply heat to the switch arm to hold the arm in its actuated position. The connections from the heating and holding resistors to the exterior of the housing enable the connection of external variable resistors in circuit with the heating and holding resistors whereby the time required for the switch to actuate and the time to switch remains actuated may each be varied.

REFERENCES:
patent: 2333125 (1943-11-01), Schmidinger
patent: 2372295 (1945-03-01), Rubenstein et al.
patent: 2527423 (1950-10-01), Jacobsen
patent: 2859305 (1958-11-01), Happe, Jr.
patent: 3227920 (1966-01-01), Peek, Jr. et al.

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