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Thermostat switches are used in temperature control systems to regulate air or liquids and can be used in both commercial and domestic applications. The two main types are capillary and bimetallic thermostats.

RS offer a range of thermostat switches such as enclosure thermostats, mechanical HVAC thermostats, digital and programmable HVAC thermostats, digital and smart thermostats with Wi-Fi.

### What Does a Thermostatic Switch Do?

Thermostats regulate the temperature of liquid in a tank, or in conjuction with air conditioning units to monitor the air in a room or system. The thermostat simply switches the system off or on whenever necessary so that a constant temperature can be maintained.

### Capillary Thermostat Switches

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 Thermostat Switches

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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Thermostatic Switches, Temperature Control Switch | RS

Thermostatic Switches

Buy from our selection of thermostatic switches from Jumo. At RS, we strive to give you the best offers from our supplier and to promptly deliver in the shortest time.

Jumo Thermostatic Switches | RS

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Bimetallic Thermostats | RS

<p>The Bi-Metallic Thermostatic consists of two different metals having different coefficients of thermal expansion. Bi-metallic thermostats are used in residential devices like air conditioners, ovens, and industrial devices like heaters, hot wires, refineries, etc. RS offers a great choice of bi-metallic thermostats from leading suppliers such as Honeywell, Selco and RS Pro.</p>

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Honeywell Thermostatic Switches | RS

<p>Precision engineering. Commercial sense. From the exacting needs of high-end industrial and aerospace applications to commercial safety and office equipment usage, Honeywell Sensing and Control thermostat solutions are the recognized, respected leader. Each thermostats design is configured from a base unit and can be customized for temperature tolerance and mechanical configurations, meeting any of your needs for accuracy and exactitude. It makes sense to trust industry-leading engineering and innovation.</p><h2>What does a Thermostatic Switch do?</h2><p>A thermostatic switch is designed to regulate temperature by switching a heating or cooling system on-off when needed to maintain a consistent temperature. A simple way to understand this is that a thermostat monitors the temperature of the liquid in a boiler to turn on the heating and warm radiators to a preset level, they can also offer temperature control of air conditioning units. </p><h3>Honeywell Thermostatic Switches</h3><p>The Honeywell thermostatic switches feature bimetallic type switching. A bimetallic thermostat consists of strips of two different metals (bimetal) that expand and contract at different temperatures, as they do so they open and close the circuit when the desired temperature is reached. Honeywell offers temperature control switches for both commercial and precision applications. Both commercial and precision snap-action thermostatic switches include automatic and manual reset options, phenolic or ceramic housings and a wide variety of mounting brackets and terminal options, the precision line includes both hermetic and non-hermetic devices.</p><p>Commercial type thermostats are suitable for a wide array of small and major appliances, automotive applications, office copy machines and HVAC equipment, plus heat and smoke detectors. Whether its military or aerospace industries, or your office building, each Honeywell sensing and control thermostat can be designed to offer the performance and reliability you demand, and the service you need.</p><p>Precision type thermostats offer a highly reliable control for potential high-end applications, including computers, copy machines, aircraft, radar, medical equipment and electronic control systems — each designed to meet the most stringent environmental conditions for dielectric strength, moisture, resistance, vibration, shock and hermetic seal for complete application flexibility.</p>

Bimetallic Thermostats

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