PTC Thermistors  Type: SNM   SKM   STM   LTM
(motor protection sensors, resistors, PTC sensors ...)



Thermik has much experience as one of the few manufacturers of PTC ceramics. As the basic technology is of great signifi cance in manufacturing, our thermistors and PTC motor protection sensors are of much higher quality than standard products.

PTC Motor Protection Sensors and Thermistors available:


Thermik thermistors are used for temperature monitoring. They are optimal for direct installation in the coils of electric motors and transformers. Thermik thermistors are also suitable in enclosures as overheating protection for electronic
components, heat-sinks etc. Please contact us for more information.


The PTCs are usually installed parallel to the coil so that the mechanical strain is minimized. The Mylar-Nomex shrink cap is well suited due to its mechanical stability (no cold flow, as opposed to Tefl on). In conjunction with the miniature pill (Ø 1,5 mm), response times of ≤ 5 secconds to a maximum of 10 secconds were achieved.


Thermik thermistors correspond to DIN 4408, DIN 44082 and IEC 34-11-2, and exhibit a very high temperature sensitivity. The resistance increases strongly in the area of the rated response temperature. This change can be used to switch off the load circuit through a triggering device. Electronic evaluations of many different applications are also possible. The typical characteristics of Thermik thermistors are presented in the temperature resistance diagram.


Resistance Diagram

Temperature Resistance Diagram and Primary Parameters as per DIN 44081 / 44082 and IEC 34-11-2

Customer Specific Designs

Design K V customer specific V upon request Possible Variations/Additions:

Application field of PTC Motor Protection Sensors / Thermistors

Application field of PTC Motor Protection Sensors / Thermistors
Application field of PTC Motor Protection Sensors / Thermistors