Electrical safety device for heaters with a high current consump

Details Electrical safety device for heaters with a high current consump Electrical safety device for heaters with a high current consump

1981-12-23

1984-02-07

Paschall, M. H.

Electric heating

Heating devices

With power supply and voltage or current regulation or...

219501, 219322, 219320, 361103, H05B 102

Patent

active

044305540

ABSTRACT:
A safety device for an electrical heater having at least one heating element which operates with high current consumption, and two power leads connected to respectively opposite ends of the heating element for connecting the heating element to a power supply. The device includes: a thermostatic switch for monitoring the temperature within the heater and having a temperature-actuated movable contact; a circuit breaker including at least one normally closed movable contact connected in series between the power leads, and a power responsive actuating coil for opening the normally closed contact in response to supply of electrical power to the coil, one side of the coil being connected to one side of the thermostatic switch movable contact; at least one first diode connected in series between one power lead and the other side of the thermostatic switch movable contact; and at least one second diode connected in series between the other side of the coil and the other power lead and poled, with respect to the voltage across the power lead, in the same direction as the first diode; whereby closing of the thermostatic switch movable contact causes power from the power supply to be supplied to the coil for opening the normally closed movable contact and disconnecting the heating element from the power supply.

REFERENCES:
patent: 3261992 (1966-07-01), Coe
patent: 3892946 (1975-07-01), Rimmi
patent: 3979576 (1976-09-01), Janson

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