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. 229-5957
Mfr. Part No.2455RP 9100-445 F90C
BrandHoneywell
HK$79.39
Each
units
0°C +186°C +75°C +90°C Bi-Metallic NO 10 A 250 V ac Solder Tab - - -
RS Stock No. 253-2694
Mfr. Part No.67F070
HK$69.04
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. 821-3490
Mfr. Part No.3455RC 01000237
BrandHoneywell
HK$126.99
Each
units
+52°C +260°C +113°C +96°C Bi-Metallic SPST 15 A 120 → 250 V ac Screw - - -
RS Stock No. 331-578
Mfr. Part No.2455R 82-711 F100C
BrandHoneywell
HK$81.68
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
HK$1,809.12
Each
units
0°C +100°C - - Capillary - 0.25 (dc) A, 10 (ac) A 230 V ac/dc Screw - - -
RS Stock No. 821-3437
Mfr. Part No.3100U 00031441
BrandHoneywell
HK$588.24
Each
units
-29°C +260°C +60°C +48.9°C Bi-Metallic SPST 3 A 120 V ac Screw - - -
RS Stock No. 111-7167
Mfr. Part No.CA-85
BrandSelco
HK$60.40
Each
units
+10°C +150°C +67°F +85°F Bi-Metallic NO 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 Close On Rise
RS Stock No. 467-169
Mfr. Part No.603026/0170-1-052-30-0-00-20-13-46-150-15-6/000
BrandJumo
HK$3,285.22
Each
units
+30°C +110°C - - Capillary NO/NC 0.25 (dc) A, 10 (ac) A 230 V ac/dc Screw - - -
RS Stock No. 613-7647
Mfr. Part No.603021/02-2-043-30-1000-40-10-00-00-000-00-6/000
BrandJumo
HK$1,566.25
Each
units
+20°C +150°C - - Capillary - 0.25 A - Screw - - -
RS Stock No. 111-7801
Mfr. Part No.OA-50
BrandSelco
HK$60.40
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. 111-7131
Mfr. Part No.TO-35
BrandSelco
HK$168.05
Each
units
0°C +204°C +35°C +20°C Bi-Metallic SPST - - Solder Tab Surface Mount Automatic Close On Rise
RS Stock No. 111-7739
Mfr. Part No.SE-L120
BrandSelco
HK$65.44
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
HK$416.62
Each
units
+95°C +120°C - - Capillary NC 16 A 400 V Quick Connect Wall Mount - -
RS Stock No. 466-986
Mfr. Part No.603026/0202-1-025-30-0-00-20-13-46-120-15-6/000
BrandJumo
HK$2,741.60
Each
units
0°C +100°C - - Capillary NO/NC 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
HK$62.81
Each
units
0°C +186°C +150°C +135°C Bi-Metallic NC 10 A 250 V ac Solder Tab - - -
RS Stock No. 111-7126
Mfr. Part No.OM-212-QC
BrandSelco
HK$148.72
Each
units
+50°C +150°C +212°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 Manual Open On Rise
RS Stock No. 821-3481
Mfr. Part No.3455RC 01000235
BrandHoneywell
HK$126.99
Each
units
+52°C +260°C +102°C +85°C Bi-Metallic SPST 15 A 120 → 250 V ac Screw - - -
RS Stock No. 331-556
Mfr. Part No.2455R 82-712 F75C
BrandHoneywell
HK$81.68
Each
units
- - +60°C +75°C Bi-Metallic NO 15 A 240 V ac Quick Connect - - -
RS Stock No. 228-2664
Mfr. Part No.2455R 9082-460 L20C
BrandHoneywell
HK$81.68
Each
units
- - +20°C - Bi-Metallic NC 15 A 240 V ac Quick Connect - - -
RS Stock No. 339-724
Mfr. Part No.2455R 82-235 L150C
BrandHoneywell
HK$81.68
Each
units
- - +150°C - Bi-Metallic NC 10 A 250 V ac Solder Tab - - -
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