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 ThermostatsThese 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 ThermostatsThese 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. 228-2608
Mfr. Part No.2455RM 9082-470 L100
BrandHoneywell
HK$94.95
Each
units
+50°C +150°C +100°C - Bi-Metallic NC 10 A 250 V ac Solder Tab - - -
RS Stock No. 111-7145
Mfr. Part No.ORA-375-QC
BrandSelco
HK$81.11
Each
units
+10°C +260°C +375°F +315°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 Rotating Bracket Automatic Open On Rise
RS Stock No. 229-5941
Mfr. Part No.2455RP 9100-446 F100C
BrandHoneywell
HK$79.39
Each
units
0°C +186°C +85°C +100°C Bi-Metallic NO 10 A 250 V ac Solder Tab - - -
RS Stock No. 821-3487
Mfr. Part No.3455RC 01000234
BrandHoneywell
HK$127.78
Each
units
+52°C +260°C +96°C +79°C Bi-Metallic SPST 15 A 120 → 250 V ac Screw - - -
RS Stock No. 111-7303
Mfr. Part No.OM-302-QCV
BrandSelco
HK$78.94
Each
units
+50°C +150°C +302°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. 467-157
Mfr. Part No.603070/0002-5-026-000-25-2000-40-28-13-46-100-8-6
BrandJumo
HK$940.48
Each
units
0°C +120°C - - Capillary - - - - - - -
RS Stock No. 229-5840
Mfr. Part No.2455RP 9100-439 L110C
BrandHoneywell
HK$79.28
Each
units
0°C +186°C +110°C +95°C Bi-Metallic NC 10 A 250 V ac Solder Tab - - -
RS Stock No. 111-7169
Mfr. Part No.CA-130-QC
BrandSelco
HK$60.40
Each
units
+10°C +150°C +110°F +130°F Bi-Metallic NO 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 Close On Rise
RS Stock No. 253-2723
Mfr. Part No.67F100
HK$49.75
Each
units
+40°C +130°C - +100°C Bi-Metallic NO 1 A 48 V dc, 120 V ac PCB Pin PCB Mount Automatic Close On Rise
RS Stock No. 494-0867
Mfr. Part No.2455RC-90820388
BrandHoneywell
HK$90.24
Each
units
0°C +260°C +160°C - Bi-Metallic SPST NC 15 A 120 → 250 V ac Quick Connect - - -
RS Stock No. 111-7119
Mfr. Part No.OA-203-ST
BrandSelco
HK$162.56
Each
units
+10°C +150°C +203°F +163°F Bi-Metallic NC 15 A @ 125 V ac 250 V ac Quick Connect Chassis Mount Automatic Open On Rise
RS Stock No. 228-2658
Mfr. Part No.2455R 9082-459 L15C
BrandHoneywell
HK$81.11
Each
units
- - +15°C - Bi-Metallic SPST 10 A 250 V ac Solder Tab - - -
RS Stock No. 339-314
Mfr. Part No.2455R 82-191 L100C
BrandHoneywell
HK$81.68
Each
units
- - +100°C - Bi-Metallic NC 10 A 250 V ac Quick Connect - - -
RS Stock No. 764-5234
Mfr. Part No.604100/20-5-140-6000-0-40/000
BrandJumo
HK$934.18
Each
units
-10°C +15°C - - Capillary SP 16 A - Push In Wall Mount - -
RS Stock No. 229-5884
Mfr. Part No.2455RP 9100-435 L70C
BrandHoneywell
HK$79.85
Each
units
0°C +186°C +70°C +55°C Bi-Metallic NC 10 A 250 V ac Solder Tab - - -
RS Stock No. 467-018
Mfr. Part No.603070/0070-5-671-000-00-2000-40-28-13-46-100-8-6
BrandJumo
HK$1,015.99
Each
units
+70°C +130°C - - Capillary - - - - - - -
RS Stock No. 111-7111
Mfr. Part No.OM-320-QC
BrandSelco
HK$110.51
Each
units
+50°C +150°C +320°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. 229-5907
Mfr. Part No.2455RP 9100-433 L50C
BrandHoneywell
HK$84.66
Each
units
0°C +186°C +50°C +35°C Bi-Metallic NC 10 A 250 V ac Solder Tab - - -
RS Stock No. 111-7115
Mfr. Part No.UP72-145C
BrandSelco
HK$98.73
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. 229-5806
Mfr. Part No.2455RP 9100-430 L20C
BrandHoneywell
HK$78.94
Each
units
0°C +186°C +20°C +10°C Bi-Metallic NC 10 A 250 V ac Solder Tab - - -
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