KSD Thermostat Switch Principle Description

KSD thermostat switch, also known as jump thermostat, is a small bimetallic thermostat with a shell. It is widely used in electrical equipment as an overheating protection element. It controls the on-off state of the circuit by sensing temperature changes to achieve temperature control and overheating protection for electrical appliances.

The working principle of the KSD thermostat switch is based on the thermal expansion and contraction characteristics of the bimetallic sheet. The bimetallic sheet is laminated by two metals with different thermal expansion coefficients. When the temperature rises, the bimetallic sheet will bend due to the different expansion degrees of the two metals. This bending triggers the opening and closing action of the contacts, controlling the opening and closing of the circuit.

When the ambient temperature or the internal temperature of the appliance reaches the set operating temperature, the bimetallic sheet bends enough to cause the contacts to change state. For example, the contacts of a normally closed thermostat will open and cut off the circuit, while a normally open thermostat will open. The contacts of the controller will close and the circuit will be connected. This quick disconnection or connection can effectively prevent electrical appliances from being damaged or causing safety accidents due to overheating.

   When the temperature drops to the set reset temperature, the bimetal will return to its original state, the contacts will automatically reset, and the circuit will resume normal operation.

At present, KSD thermostat switches are widely used in household appliances such as electric water heaters, rice cookers, electric soldering irons, and electric irons, as well as in industrial equipment such as motors and transformers.