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H01H43/00—Time or time-programme switches providing a choice of time-intervals for executing one or more switching actions and automatically terminating their operation after the programme is completed
H01H43/30—Time or time-programme switches providing a choice of time-intervals for executing one or more switching actions and automatically terminating their operation after the programme is completed with timing of actuation of contacts due to thermal action
H01H43/308—Time or time-programme switches providing a choice of time-intervals for executing one or more switching actions and automatically terminating their operation after the programme is completed with timing of actuation of contacts due to thermal action based on the change of electrical properties, e.g. thermistors
Temp. regulating circuitry for electrical heating element - uses current measuring resistor and reference voltage forming divider consisting of ohmic resistors in series with element