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Our PTC (Positive Temperature Coefficient) Thermistors are designed for direct installation in the windings of electric motors and transformers.

They protect the electric motor windings against locked-rotor conditions, continuous overload and high ambient temperature.

Usually three are used in an electric motor connected in series

Thermik PTC Thermistors correspond to DIN 4408, DIN 44082 and IEC 34-11-2

Each temperature PTC Thermistor has a designated temperature and when this temperature is reached in the machine it is installed in, its resistance is increases abruptly.

PTC thermistors are internationally colour coded as in the diagram.

They have a very high temperature sensitivity

They are a very cost effective type of thermal protection for electric motors.

Triplex and duplex versions as in the Diagram are available on special requests.

PTC Thermistors
PTC Thermistors Electric Motor Thermal Protection
Duplex and Triplex
PTC Thermistors