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Briefly explained: Protection/Regulation

Limitor offers a wide range of protection elements and controllers. In this blog post, we take a closer look at the individual product groups.


Temperature Detector

As the name suggests, the Temperature Detector monitors the temperature. If a preset temperature is exceeded, the circuit is interrupted so that the system or the device can cool down.

It should be noted that a Temperature Detector has a non-automatic switch-off function. So, when the temperature falls back into the normal range, the circuit will be closed again, and the unit will start up again.

An example of this is heaters. They are either turned to a certain temperature or a certain number on the heating controller. When the room reaches the desired temperature, the heater switches off. If the temperature falls below the set temperature, they start to heat up again.

Temperature Limiter

A Limiter works in a similar way as the Detectors described above. Here, too, the circuit is interrupted if a previously set temperature is exceeded.

But Temperature Limiters have a self-latching shut-off function. So even if the unit has cooled down, the circuit is not closed again, and the process is not restarted. You therefore must switch it back on manually.

Many of us have a blender in our kitchen. If it overheats, it switches itself off automatically. To use the appliance again, it first needs to cool down and then you can switch it on again manually.

Current and Temperature Limiter

With Current and Temperature Limiters, attention is paid not only to a possible switch-off temperature but also to an increased current supply, which has been defined beforehand with the help of a resistor. If the limit is reached, a bimetal disc is heated up to a snap temperature so that the switching contact is opened. This leads to a power interruption.

To switch the unit on again, it must first be disconnected from the mains voltage. This is because the bimetal disc does not spring back on its own because heat is generated by the applied mains voltage by means of a resistor.

In a coffee machine, everything revolves around the correct temperature. In the event of a malfunction, this temperature may be exceeded. If this is the case, the machine switches off. In this case, however, the user must also disconnect the power supply before the machine can start to cool down.

Thermal Fuse

Limitor's temperature fuses are one-time fuses. So, if the thermal fuse is triggered by exceeding a certain temperature, it cannot be used again.

For example, if a car's electric motor overheats, a fuse can be triggered for protection.

Limitor manufactures high-quality products that are individually tested several times. In addition, our switches are certified according to VDE or UL. If you have any questions about the products, please contact us at info@limitor.de or phone +49 7181 483 900.

Article published on: 08/07/2022

Article last updated on: 30/05/2023