The temperature limiter Q is used wherever, on the one hand, protection against over-temperature is required, and, on the other hand, automatic cut-in of the device to be protected – subsequent to a follow-on cooling down period – is undesirable or not permissible.



The temperature limiter Q operates independently from any power supply. The temperature is detected by means of a bimetal disk which is first dimensioned in accordance with the required cut- off temperature. When this fixed cut off temperature TA is reached, this bimetal disk snaps over, breaking a contact system and thereby interrupting the electric circuit of the device to be protected.
In order to prevent any automatic reset function of the device when the switch cools down again, the switch is equipped with an electrical self-holding resistor inside.

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