Temperature detectors operate independent from any current supply. Temperature detection is effected by means of a bimetal disc which is dimensioned in accordance with the required cut-off temperature. When this fixed cut-off temperature is reached, the switch opens (type P) or closes (type O) the electric circuit of the device.
After cooling down at reset temperature, the contact system returns to its original position.
Temperature Switch O
Bimetal thermal switch, normally open
Up to 1.0 A
50 – 130 °C
Temperature Switch P Bimetal thermal switch, normally closed
Up to 4.0 A
40 – 150° C