Thermoswitches and thermosensors
Thermoswitches and thermosensors

Temperature switches are primarily used to protect motors from overheating. In contrast to temperature switches with bimetal functionality, the expansion principle forms the basis for our switches. The switches deliver outstanding quality and durability, even in the toughest industrial applications. In addition to a standard delivery, we also offer three-pole multiple switches for more complex applications. These multi-function switches enable data acquisition of the current temperature level as well as the standard switching function.

How temperature switches operate

Temperature switches mainly offer control of drives for electric cooling fans, mobile and stationary engine cooling systems, and machines in the engine cooling circuit. The switches are necessary to prevent the engine from overheating in certain driving situations. Risk arises, for example, if a vehicle is parked after a heavy load and the airstream cooling suddenly ceases. In such a case, the cooling fan has to provide the necessary air flow and cooling wind in the area of ​​the radiator so that the engine temperature does not rise above a maximum value.

Our thermal circuit breakers are based on an expansion element. If the coolant reaches a certain temperature, the expansion material reacts by increasing its volume. The working piston set in motion as a result switches on the fan. If the temperature falls below the specified temperature again, the expansion material reacts accordingly and the self-acting element switches the fan off. The on/off function can be performed by a single switch or by a separate on or off switch.

Combination product: temperature switches in BTM multifunction oil thermostats

Also be sure to take note of our combination products under our BTM multifunction oil thermostats with oil filter connection. We not only offer our thermal circuit breakers separately, but also directly integrated in a multifunctional oil temperature controller. Our switches are installed in model X1.309.*) .000 of our BTM multifunction oil thermostat with oil filter connection. There, they regulate the on or off switching of a connected fan in the system.

Our temperature switches at a glance:

  • X8.161.*).000: single-pole off switch (switching point above: 50° C, below: 45° C)
  • X8.160.*).000: single-pole on-switch (switching point above: 55° C, below: 50° C)
  • X8.121.*).000: single-pole off switch (switching point above: 55° C, below: 50° C)
  • X8.124.*).000: single-pole on-switch (switching point above: 50° C, below: 45° C)
  • X1.309.*).000: integrated in the BTM multifunction oil thermostat

The individual switching points and differences, as well as the maximum permissible temperatures, can be found in the respective type tables.

Background knowledge: temperature switches

Temperature switches or thermal switches are components of thermostats. In general, this is a switch that changes its state depending on the temperature in an environment. Well-known areas of application in everyday life are irons, kettles or refrigerators, in which the heating or cooling is switched on or off as soon as a certain temperature is reached. Often, temperature-controlled bimetal switches are used that are equipped with a bimetal strip or plate that bends when the specified temperature is reached and actuates a snap switch. Other designs include temperature switches with liquid or different materials.

If you have any questions about our thermal switches, please use our contact form, write us an email or give us a call. We are happy to offer you personalised advice.