Thermostatic switch

Details Thermostatic switch Thermostatic switch

1982-07-12

1983-10-04

Harris, George

Electricity: electrothermally or thermally actuated switches

Thermally actuated switches

Expansible or vaporizable fluid actuated

337326, H01H 3740

Patent

active

044081782

ABSTRACT:
The chamber in the metal body is filled with Freon which starts to vaporize at a temperature below the operating temperature of the switch. The vapor pressure increases substantially as the temperature rises above the refrigerant boiling point and acts against the diaphragm. The force in the diaphragm is opposed by the spring acting on the moveable seat which bears on the diaphragm pad. The pad carries a shorting bar which completes the circuit between the fixed contacts when the spring is overcome.

REFERENCES:
patent: 3809835 (1974-05-01), Watt
patent: 4262274 (1981-04-01), Howe et al.

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