Thermostatic Switches

ThermThermostats 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. 746-3164
Mfr. Part No.E5LA0100
BrandOmron
kr 900,00
Each
Units
0°C +100°C - - - SPDT 10 A - - - - -
RS Stock No. 331-556
Mfr. Part No.2455R 82-712 F75C
BrandHoneywell
kr 36,59
Each
Units
- - +60°C +75°C Bi-Metallic NO 15 A 240 V ac Quick Connect - - -
RS Stock No. 494-0867
Mfr. Part No.2455RC-90820388
BrandHoneywell
kr 58,59
Each
Units
0°C +260°C +160°C - Bi-Metallic SPST NC 15 A 120 → 250 V ac Quick Connect - - -
RS Stock No. 357-9830
Mfr. Part No.608501/2160-926-02-2000-873-6-104-95-46-150-20/000
BrandJumo
kr 1 924,81
Each
Units
+50°C +250°C - - Capillary - - - - - - -
RS Stock No. 467-012
Mfr. Part No.603070/0001-5-026-000-25-2000-40-28-13-46-100-8-6
BrandJumo
kr 793,11
Each
Units
0°C +120°C - - Capillary - - - - - - -
RS Stock No. 331-534
Mfr. Part No.2455R 82-715 L120C
BrandHoneywell
kr 50,67
Each
Units
0°C +150°C +120°C +105°C Bi-Metallic NC 15 A 120 → 250 V ac Quick Connect - - -
RS Stock No. 613-7827
Mfr. Part No.602021/0001
BrandJumo
kr 500,49
Each
Units
+50°C +200°C - - Capillary NO/NC 16 A - - - - -
RS Stock No. 357-7367
Mfr. Part No.608501/2160-818-02-2000-873-6-104-96-46-150-20/000
BrandJumo
kr 1 873,46
Each
Units
0°C +120°C - - Capillary - - - - - - -
RS Stock No. 703-2467
Mfr. Part No.04.53.0005.1
BrandGrasslin
kr 2 681,33
Each
Units
+5°C +30°C - - - - 5 A - - Wall Mount - -
RS Stock No. 111-7299
Mfr. Part No.802L-085
BrandSelco
kr 83,78
Each
Units
+40°C +120°C +85°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. 613-7653
Mfr. Part No.602010/70-043-00-2000-20-10-00-00-000-00-6/000
BrandJumo
kr 2 162,49
Each
Units
+20°C +150°C - - Capillary - 0.25 (dc) A, 10 (ac) A 230 V ac/dc Screw - - -
RS Stock No. 229-5812
Mfr. Part No.2455RP 9100-441 L150C
BrandHoneywell
kr 53,03
Each
Units
0°C +186°C +150°C +135°C Bi-Metallic NC 10 A 250 V ac Solder Tab - - -
RS Stock No. 331-556A
Mfr. Part No.2455R 82-712 F75C
BrandHoneywell
kr 27,558
Each (In a Pack of 25)
Units
- - +60°C +75°C - NO 15 A 240 V ac Quick Connect - - -
RS Stock No. 229-5878
Mfr. Part No.2455RP 9100-436 L80C
BrandHoneywell
kr 55,48
Each
Units
0°C +186°C +80°C +65°C Bi-Metallic NC 10 A 250 V ac Solder Tab - - -
RS Stock No. 746-3168
Mfr. Part No.E5LA050
BrandOmron
kr 900,00
Each
Units
0°C 50°C - - - SPDT 10 A - - - - -
RS Stock No. 111-7801
Mfr. Part No.OA-50
BrandSelco
kr 68,10
Each
Units
+10°C +150°C +50°F +32°F Bi-Metallic NC 10 A @ 250 V ac, 15 A @ 125 V ac 125 V ac @ 15 A, 250 V ac @ 10 A Solder Tab Surface Mount Automatic Open On Rise
RS Stock No. 467-153
Mfr. Part No.603070/0020-5-671-000-70-2000-40-28-13-46-100-8-6
BrandJumo
kr 856,82
Each
Units
+70°C +130°C - - Capillary - - - - - - -
RS Stock No. 111-7739
Mfr. Part No.SE-L120
BrandSelco
kr 111,56
Each
Units
+1°C +150°C +120°F +106°F Bi-Metallic NC 25 A @ 120/240 V ac 120 V ac @ 25 A, 240 V ac @ 25 A Quick Connect Panel Mount Automatic Open On Rise
RS Stock No. 518-4399
Mfr. Part No.602031/81-666-000-00-2000-40-10-6-40-13-460/707,
BrandJumo
kr 416,25
Each
Units
+95°C +120°C - - - NC 16 A 400 V Connector - - -
RS Stock No. 821-3437
Mfr. Part No.3100U 00031441
BrandHoneywell
kr 387,75
Each
Units
-29°C +260°C +60°C +48.9°C Bi-Metallic SPST 3 A 120 V ac Screw - - -
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