Temperature switches are devices used to detect temperature changes and trigger a response, such as turning on or off a heating or cooling system, activating an alarm, or initiating a safety shutdown. There are several types of temperature switches, each designed for specific applications and temperature ranges. Here are some common types:

1. Bimetallic Temperature Switch: Bimetallic temperature switches consist of two different metals bonded together, each with a different coefficient of thermal expansion. As temperature changes, the metals expand or contract at different rates, causing the bimetallic strip to bend or deform. This bending action is used to open or close an electrical contact, thus controlling the circuit.

2. Thermostatic Switch: Thermostatic switches utilize a temperature-sensitive element, such as a bimetallic strip, bellows, or thermocouple, to sense temperature changes. When the temperature reaches a predetermined setpoint, the switch mechanism is actuated, either opening or closing a circuit to control a heating or cooling system.

3. Thermocouple Switch: Thermocouple switches utilize the Seebeck effect, where a voltage is generated when two dissimilar metals are joined at two junctions. When the temperature at the sensing junction exceeds a setpoint, the generated voltage triggers a relay or switch mechanism, initiating the desired response.

4. Thermistor Switch: Thermistor switches use a thermistor, which is a temperature-sensitive resistor, as the sensing element. As temperature changes, the resistance of the thermistor changes accordingly. When the resistance reaches a certain threshold, it triggers the switch mechanism to activate or deactivate a circuit.

5. Electronic Temperature Switch: Electronic temperature switches utilize solid-state temperature sensors, such as integrated circuit (IC) temperature sensors or semiconductor-based sensors, to detect temperature changes. These sensors provide accurate and precise temperature measurements, and the switch mechanism is controlled electronically based on programmed setpoints.

6. Capillary Tube Temperature Switch: Capillary tube temperature switches consist of a temperature-sensitive fluid-filled capillary tube connected to a diaphragm or bellows mechanism. As temperature changes, the expansion or contraction of the fluid in the capillary tube causes the diaphragm or bellows to actuate a switch, controlling the circuit.

7. Pneumatic Temperature Switch: Pneumatic temperature switches use a temperature-sensitive element, such as a bimetallic strip or filled bulb, to control the pressure of a pneumatic system. When the temperature exceeds a setpoint, the pressure in the system changes, triggering a pneumatic switch to activate or deactivate the system.

These are some of the common types of temperature switches used in various industrial, commercial, and residential applications. The selection of the appropriate type depends on factors such as temperature range, accuracy, response time, and the specific requirements of the application.