Limitor - Temperature detector


Our own plant produces high quality, customized temperature detectors; the functionality of every single switch is multiple tested and thus 100% reliability is guaranteed. The switches are VDE or UL certified.

We offer a wide range of commercial goods for standard solutions.

Area of application

Our temperature detectors are used wherever protection against overtemperatures is required/necessary.

Typical applications include:

  • protection of primary windings in transformers
  • winding protection in small electric motors
  • general temperature protection of small electric equipment
  • switch-on of cooling fans
  • signalling
  • etc.


The 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.


Product name Product type Short description Performance Temperature range Product page Data sheet
HOT »PBimetallic switchThermal switch. Limitor product. Over 1000 switching cycles. Reflects the highest quality standards.up to 4.0 A40 - 150 °C
HOT »QBimetallic switchThermal switch with self-holding function. Limitor product. Reflects the highest quality standards.up to 6.5 A40 - 150 °C
HOT »YBimetallic switchLimitor product. Temperature- and current limiter, with self-holding function. Reflects the highest quality standards.up to 6.5 A40 - 150 °C
HOT »OBimetallic switchNormally open.up to 1.0 A50 - 130 °C
HOT »TB97Bimetallic switchHigh Temperature Protector TB97up to 13.0 A180 - 450 °C
BM1Bimetallic switchThermal Protector BM-1up to 20.0 A45 - 180 °C
TB02, TB05, TB11Bimetallic switchThermal protector TB02/TB05/TB11up to 17.0 A30 - 165 °C
KO, KS, KB, SOBimetallic switchTemperature Switch Controller/Limiterup to 16.0 A-25 - 200 °C
ST 01, ST06Bimetallic switchMotor protectorup to 5.0 A60 - 200 °C
TK 24Bimetallic switchTemperature detector TK 24 / TK 32up to 16.0 A-45 - 425 °C
KSDBimetallic switchTemperature Switch Controller/Limiterup to 16.0 A0 - 280 °C