Category : Temperature measurement and control instruments > Cables and other accessories

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It is more and more necessary to protect equipments against over temperature effects. This is particularly true for electrical engines, transformers, power circuits.

Thermal protections are realised either with a system of detection and measurement of temperature with NTC or PTC thermistors
(see these chapters), or with a thermal switch which opens the circuit to protect, or for high powers a relay, or closes a contact on a fan to refresh the equipment.

Thermal switch (frequently named, per mistake, thermostat) is a bi metallic element which operates with the metals dilatation : two
different dilatation coefficients (e.g. copper and steel) are put together either by bonding or electrolytic deposit, then cutted out in blades or in discs stamped as a bowl.

When the temperature increases, copper which expands more than steel, make a deformation of the blade which bends or the discs which reverses, this allows to open or close a circuit.

These switches are protected with a housing. Several shapes are available and they can switched off intensities from 1 to 25 Amp.

When the temperature decreases, the blade or disc will recover its initial shape and re-establish the contact.

An important differential is necessary to avoid a too fast re-contacting and allows the equipment to cool down before a re-starting.

The temperature imiting switch is a thermal switch which needs a manual operation to re-start.

List of all articles from this supplier

- Platinum and Nickel Probes
- Thermocouple Probes
- Thermistors Probes
- NTC Thermistors

List of all articles from this supplier

List of articles in this sub-category

- Harnesses for gas turbines
- Thermocouple Cables

List of all articles in this sub-category Cables and other accessories

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