Temperature-compensated thermal protector

Details Temperature-compensated thermal protector Temperature-compensated thermal protector

H - Electricity

02

H

323/6

H02H 5/04 (2006.01) H01C 7/02 (2006.01)

Patent

CA 2023286

TEMPERATURE-COMPENSATED THERMAL PROTECTOR ABSTRACT OF THE DISCLOSURE A protective PTC device is heated by a heater PTC device or by a resistor to an elevated temperature greater than ambient but less than its switching temperature. The elevated temperature of the protective PTC device reduces its switching response time, and minimizes variations in such response time with variations in ambient temperature. The protective PTC device is connected in series with an electrical load to reduce current to a load when the protective PTC device is switched to its high-resistance state by a temperature increase resulting from overcurrent. The heater PTC device or the heater resistor may be in parallel or in series with the protective PTC device. The heater PTC device does not carry load current, but the heater resistor may be placed in series with the load and the protective PTC device so as to carry load current along with the protective PTC device. - 1 -

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