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Thermostat/Thermal Overload Protector for Over Temperature Protection of Heat Sinks

For over temperature and burnout protection of Heat Sinks, the Thermal Overload Protector Model BPM is best suited.

Heat Sink Thermostat

Heat Sink Thermostat – Model BPM

Description of Thermal Overload Protector

To cater to the requirements of the electronics industry in India, our engineers have especially developed the Model BPM thermal cut-out for heat sink over-temperature protection. With our focus on quality and the extensive R&D and manufacturing facility in India, our engineers have developed the thermal cut-out Model BPM.

This marvel of precision engineering and miniaturization is the smallest thermal overload protector in our entire range of products. This thermostat has been specifically designed for over temperature protection of electronic equipment by sensing temperature rise of heat sinks. Since this thermal cutout has a thickness of only 3.3mm, it can be placed between the fins of a heat sink. Any adhesive such as silicone glue, epoxy, etc. can be applied over the thermal cutout so that it is permanently fixed in place. Our snap action bimetal thermostat operates on the over center mechanism, which gives it a quick restart characteristic and stable trip temperature, even after continuous usage. The normal snap action disc thermostats have a delayed restart and the trip temperature drifts downwards after continuous usage.

Due to small size, the response to heat rise is fast, and when the equipment overheats, the thermal cut-out trips off, thereby, ensuring complete protection to all electronic equipment against over heating. It is available with Normally Closed (NC) or Normally Open (NO) contacts. The internal mechanism is fully spot welded on a steel housing plate. Due to sophisticated materials used and intelligent design, the size has been reduced without affecting the operating characteristics of the thermal overload protector. The outer body is made of high temperature resistant engineering polymer. Lead wires are teflon insulated. The internal tripping contacts are solid silver alloy for long life. The body is sealed and resistant to moisture, gases, fumes and varnish. It is available for any trip temperature required from 50 degrees C to 160 degrees C.

Thermostat inside Heat Sink

Thermostat inside Heat Sink

Special Features of Thermal Overload Protector:

  • Small size for easy fitting.
  • Snap Action bimetal thermostat, precise operating temperature
  • Quick make and break switching, no Sparking or contact chattering
  • Solid silver contacts for long life of 1,00,000 operations
  • Sealed body resistant to moisture, gases, fumes and varnish
  • Lead wires are teflon insulated.
  • Available with Normally Closed (NC) or Normally Open (NO) contacts
  • Available for any trip temperature required from 50 degrees C to 160 degrees C

Heat Sink with Thermostat in a Circuit

Heat Sink with Thermostat in a Circuit


Use of Model BPM is recommended in applications where temperature of heat sinks need to be sensed for over heating and burnout protection. The thermal cut-out is connected in series with the main circuit or a control circuit. In case of over heating, the temperature of the heat sink will rise and the thermostat will sense this and trip off, thereby, switching off the main circuit and saving the equipment from burning out. This model is also available with Normally Open (NO) contacts, so that it can also be used to provide an indication or signal of over heat by connecting it to a fan or a control circuit, which is activated when the contacts close. The trip off temperature is specified by the customer and supplied factory preset. It cannot be changed or adjusted afterwards. Please consult us for complete technical guidance.

Click here to see Technical Specifications of Thermostat for over-temperature protection of Heat Sinks