When the room cools down, the bimetal strip or bellows relaxes and snaps the contacts closed. Electricity flows to the load. Once the desired temperature is reached, the mechanism expands and forces the contacts open, cutting off the heat. ⚖️ Advantages and Disadvantages Advantages Disadvantages
Mechanical tolerances cause wider temperature swings. termostat mehanicheskij shema
Two different metals with distinct rates of thermal expansion are bonded together. As the temperature changes, one metal expands more than the other, causing the strip to bend. This bending physically pushes a contact to break or complete the circuit. When the room cools down, the bimetal strip
Resistant to voltage spikes and extreme ambient temperatures. This bending physically pushes a contact to break
This system uses a sealed bulb filled with a temperature-sensitive gas or liquid. As it heats up, the fluid expands, increasing pressure and expanding a flexible bellows or diaphragm. This movement triggers the mechanical switch. 🔌 Typical Electrical Schematic (Схема)
. It operates by translating temperature changes into physical movement to open or close an electrical circuit or a valve. ⚙️ Operating Principle
In a basic heating system (like an electric baseboard or a simple boiler control), the thermostat is wired in series with the power supply and the load.