Thermostatic Switches

Thermostats are used in temperature control systems regulating air or liquids and can be used in both commercial and domestic applications. The two main types are capillary and bimetallic thermostats.
RS Components offer a range of thermostats such as enclosure thermostats, mechanical HVAC thermostats, digital and programmable HVAC thermostats, digital and smart thermostats with Wi-Fi.

What Does a Thermostat Do?
It regulates the temperature of a liquid in a tank, or in conjuction with air conditioning units to monitor the air in a room/system. The thermostat simply switches the system off or on whenever necessary so that a constant temperature can be maintained. At home room thermostats switches on the heating when the room is cold and once the temperature has reached the level set, the programmable thermostat switches the heating off.

Capillary Thermostats
These consist of a sensor, capillary tube, diaphragms, a probe and an expansion medium. When the liquid heats up and expands, the temperature sensor is heated allowing for it to be converted into displacement in the diaphragm. The contacts within the closed circuit system can be opened or closed by this displacement due to pressure.
Due to their accuracy and easy installation, they are widely used to control air and water temperatures and are suitable for use in storage heaters, hot tanks and boilers to control hot water.

Bimetallic Thermostats
These consist of a strip of two different metals with different coefficients of linear expansion. The bimetallic strip acts as an electric contact breaker in an electric heating circuit. When the desired temperature is reached, the circuit is broken.
The strips of metal are bolted together. A bridge is then created in the electrical circuit and is connected to your heating system. The strip carries electricity through the circuit when the heating is on. When the strips get hot, both of the metals expand but one more so than the other. The hottest metal bends and opens the circuit. Once the circuit is open the electricity switches off and the heating cuts out.
Once the heating is off, the room cools down which in turn cools down the strip of metal and allows it to go back to its original shape. When it cools, the metal goes back into the circuit and switches the heating back on as the electricity flow has been re-established. The metal strip takes a while to expand and contract so the heating is not constantly switching on and off every few seconds.

...
Read more Read less

Filters

Viewing 1 - 20 of 126 products
Results per page
Description Price Minimum Temperature Maximum Temperature Opening Temperature Closing Temperature Thermostat Type Switch Configuration Contact Rating Contact Voltage Rating Terminal Type Hazardous Area Certification Mounting Type Reset Type Switch Function
RS Stock No. 339-308
Mfr. Part No.2455R 82-195 L70C
BrandHoneywell
$16.26
Each
units
0°C +150°C +70°C +55°C Bi-Metallic SPST NC 15 A 240 V ac Quick Connect - - - Open On Rise
RS Stock No. 339-291
Mfr. Part No.2455R 82-196 L40C
BrandHoneywell
$11.19
Each
units
- - +40°C - Bi-Metallic NC 10 A 250 V ac Solder Tab - - - -
RS Stock No. 228-2636
Mfr. Part No.2455R 9082-462 L50C
BrandHoneywell
$15.48
Each
units
- - +50°C - Bi-Metallic NC 10 A 250 V ac Solder Tab - - - -
RS Stock No. 331-534
Mfr. Part No.2455R 82-715 L120C
BrandHoneywell
$15.19
Each
units
0°C +150°C +120°C +105°C Bi-Metallic NC 15 A 120 → 250 V ac Quick Connect - - - -
RS Stock No. 229-5935
Mfr. Part No.2455RP 9100-442 F35C
BrandHoneywell
$15.51
Each
units
0°C +186°C +20°C +35°C Bi-Metallic NO 10 A 250 V ac Solder Tab - - - -
RS Stock No. 339-314
Mfr. Part No.2455R 82-191 L100C
BrandHoneywell
$16.36
Each
units
- - +100°C - Bi-Metallic NC 10 A 250 V ac Quick Connect - - - -
RS Stock No. 228-2591
Mfr. Part No.2455RM 9082-471 L120
BrandHoneywell
$18.94
Each
units
+50°C +150°C +120°C - Bi-Metallic NC 10 A 250 V ac Solder Tab - - - -
RS Stock No. 494-0867
Mfr. Part No.2455RC-90820388
BrandHoneywell
$14.10
Each
units
0°C +260°C +160°C - Bi-Metallic SPST NC 15 A 120 → 250 V ac Quick Connect - - - -
RS Stock No. 733-4723
BrandRS PRO
$60.08
Each
units
0°C 90°C - - Capillary SPDT 16 A 250 V ac - - Panel Mount Automatic -
RS Stock No. 228-2620
Mfr. Part No.2455R 9082-463 L110C
BrandHoneywell
$15.30
Each
units
- - +110°C - Bi-Metallic NC 10 A 250 V ac Solder Tab - - - -
RS Stock No. 228-2579
Mfr. Part No.2455RM 9082-469 L90C
BrandHoneywell
$18.94
Each
units
+50°C +150°C +90°C - Bi-Metallic NC 10 A 250 V ac Solder Tab - - - -
RS Stock No. 331-540
Mfr. Part No.2455R 82-713 F60C
BrandHoneywell
$16.36
Each
units
- - +45°C +60°C Bi-Metallic NO 15 A 240 V ac Quick Connect - - - -
RS Stock No. 331-562
Mfr. Part No.2455R 82-714 F90C
BrandHoneywell
$16.36
Each
units
0°C +150°C +75°C +90°C Bi-Metallic NO 15 A 240 V ac Quick Connect - - - -
RS Stock No. 228-2541
Mfr. Part No.2455RC 9082-465 L200
BrandHoneywell
$14.77
Each
units
0°C +260°C +200°C +160°C Bi-Metallic NC 10 A 250 V ac Solder Tab - - - -
RS Stock No. 733-4713
BrandRS PRO
$61.38
Each
units
0°C +40°C - - Capillary SPDT 16 A 250 V ac - - Panel Mount Manual -
RS Stock No. 331-528
Mfr. Part No.2455R 82-716 L90C
BrandHoneywell
$16.26
Each
units
0°C +150°C +90°C +75°C Bi-Metallic SPST NC 10 → 15 A 240 V ac Quick Connect - - - -
RS Stock No. 229-5834
Mfr. Part No.2455RP 9100-440 L125C
BrandHoneywell
$14.14
Each
units
0°C +186°C +125°C +110°C Bi-Metallic NC 10 A 250 V ac Solder Tab - - - -
RS Stock No. 494-0873
Mfr. Part No.2455RC-90820389
BrandHoneywell
$13.43
Each
units
0°C +260°C +180°C - Bi-Metallic - 15 A - Quick Connect - - - -
RS Stock No. 733-4735
BrandRS PRO
$61.98
Each
units
+90°C +110°C - - Capillary SPDT 16 A 250 V ac - - Panel Mount Manual -
RS Stock No. 228-2608
Mfr. Part No.2455RM 9082-470 L100
BrandHoneywell
$18.94
Each
units
+50°C +150°C +100°C - Bi-Metallic NC 10 A 250 V ac Solder Tab - - - -
Related Products
A mains powered room thermostat with a large ...
Description:
A mains powered room thermostat with a large clear dial, is designed for you to have automatic temperature control of your heating with ease. This attractive, yet simple to use thermostat requires no earth wire for operation, comes double insulated ...
For controlling and monitoring thermal processesSurface-mounting twin thermostats ...
Description:
For controlling and monitoring thermal processesSurface-mounting twin thermostats consist of two separate measuring and switching systemsThey work on the principle of liquid expansion; a microswitch serves as an electrical switching elementVersion with rigid shaftProtection rating IP54.
The ORA series from Selco offers a highly ...
Description:
The ORA series from Selco offers a highly reliable range of 1/2” disc thermostats. These snap action thermostats open or close a circuit at a factory pre-set temperature and have been designed to work in a variety of different applications ...
The surface mount thermostat works on the principle ...
Description:
The surface mount thermostat works on the principle of volume expansion, if the temperature of the filling medium inside the probe increases the volume increases which results in the elevation of a diagrapm that triggers a microswitch. IP54 Rated1xSPDT switching ...