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.

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Description Price Minimum Temperature Maximum Temperature Opening Temperature Closing Temperature Thermostat Type Switch Configuration Contact Rating Contact Voltage Rating Terminal Type Mounting Type Reset Type Switch Function
RS Stock No. 253-2694
Mfr. Part No.67F070
MYR35.76
Each
units
+40°C +130°C - +70°C Bi-Metallic NO 1 A 48 V dc, 120 V ac PCB Pin PCB Mount Automatic Close On Rise
RS Stock No. 111-7102
Mfr. Part No.OM-140-QC
BrandSelco
MYR45.77
Each
units
+50°C +150°C +140°F - Bi-Metallic NC 10 A @ 250 V ac, 15 A @ 125 V ac 125 V ac @ 15 A, 250 V ac @ 10 A Quick Connect Surface Mount Manual Open On Rise
RS Stock No. 357-7834
Mfr. Part No.602021/0005-064-000-25-1000-40-10-00-00-000-00-6
BrandJumo
MYR718.34
Each
units
+50°C +300°C - - Capillary - 20 mA 24 V ac/dc Solder Tab - - -
RS Stock No. 158-4442
Mfr. Part No.603021/02-1-025-30-0-00-20-13-46-120-8-6/000
BrandJumo
MYR991.97
Each
units
0°C +100°C - - Capillary NO/NC 10 A 230 V ac/dc Solder Tab - - -
RS Stock No. 229-5862
Mfr. Part No.2455RP 9100-437 L90C
BrandHoneywell
MYR40.88
Each
units
0°C +186°C +90°C +75°C Bi-Metallic NC 10 A 250 V ac Solder Tab - - -
RS Stock No. 228-2591
Mfr. Part No.2455RM 9082-471 L120
BrandHoneywell
MYR49.39
Each
units
+50°C +150°C +120°C - Bi-Metallic NC 10 A 250 V ac Solder Tab - - -
RS Stock No. 357-7799
Mfr. Part No.602021/0005-028-000-25-1000-40-10-00-00-000-00-6
BrandJumo
MYR625.94
Each
units
0°C +200°C - - Capillary - 16 A 24 V ac/dc Solder Tab - - -
RS Stock No. 111-7798
Mfr. Part No.OA-220-QC
BrandSelco
MYR31.42
Each
units
+10°C +150°C +220°F +190°F Bi-Metallic NC 10 A @ 250 V ac, 15 A @ 125 V ac 125 V ac @ 15 A, 250 V ac @ 10 A Quick Connect Surface Mount Automatic Open On Rise
RS Stock No. 228-2608
Mfr. Part No.2455RM 9082-470 L100
BrandHoneywell
MYR49.39
Each
units
+50°C +150°C +100°C - Bi-Metallic NC 10 A 250 V ac Solder Tab - - -
RS Stock No. 228-2535
Mfr. Part No.2455RC 9082-466 L220C
BrandHoneywell
MYR44.74
Each
units
0°C +260°C +220°C +180°C Bi-Metallic NC 10 A 250 V ac Solder Tab - - -
RS Stock No. 229-5812
Mfr. Part No.2455RP 9100-441 L150C
BrandHoneywell
MYR32.67
Each
units
0°C +186°C +150°C +135°C Bi-Metallic NC 10 A 250 V ac Solder Tab - - -
RS Stock No. 158-4436
Mfr. Part No.603021/01-1-043-30-0-00-20-13-46-100-8-6/000
BrandJumo
MYR1,011.62
Each
units
+20°C +150°C - - Capillary NO/NC 10 A 230 V ac/dc Solder Tab - - -
RS Stock No. 111-7115
Mfr. Part No.UP72-145C
BrandSelco
MYR51.35
Each
units
+60°C +150°C - - - NC 4 A @ 125 V ac 250 V ac PCB Pin PCB Mount Automatic Open On Rise
RS Stock No. 331-578
Mfr. Part No.2455R 82-711 F100C
BrandHoneywell
MYR42.48
Each
units
- - - +85°C Bi-Metallic NO 15 A 240 V ac Quick Connect - - -
RS Stock No. 357-7907
Mfr. Part No.603021/02-2-025-30-1000-40-10-00-00-000-00-6/000
BrandJumo
MYR940.93
Each
units
0°C +100°C - - Capillary - 0.25 (dc) A, 10 (ac) A 230 V ac/dc Screw - - -
RS Stock No. 331-540
Mfr. Part No.2455R 82-713 F60C
BrandHoneywell
MYR42.48
Each
units
- - +45°C +60°C Bi-Metallic NO 15 A 240 V ac Quick Connect - - -
RS Stock No. 853-6633
Mfr. Part No.3100U 00031438
BrandHoneywell
MYR367.35
Each
units
-29°C +260°C +43°C +32.2°C Bi-Metallic SPST 3 A 120 V ac PCB Pin PCB Mount - -
RS Stock No. 494-0845
Mfr. Part No.2455R-0820386
BrandHoneywell
MYR40.94
Each
units
0°C +150°C - - Bi-Metallic SPST 15 A 120 → 250 V ac Quick Connect - - -
RS Stock No. 111-7298
Mfr. Part No.802L-080
BrandSelco
MYR38.56
Each
units
+40°C +120°C +80°C - Bi-Metallic SPST NC 1 A @ 120 V ac, 1 A @ 48 V dc, 20 mA @ 5 V dc 120 V ac @ 1 A, 48 V dc @ 1 A, 5 V dc @ 20 mA PCB Pin PCB Mount - Open On Rise
RS Stock No. 357-7525
Mfr. Part No.602021/0001-027-000-25-1000-40-10-00-00-000-00-6
BrandJumo
MYR315.49
Each
units
0°C +150°C - - Capillary - 0.25 A @ 230 Vdc, 16 A @ 230 Vac 230 V ac/dc Solder Tab - - -
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