KSD9700 product is a kind of thermostat which adopt the bimetal head as the temperature sensing element. The bimetal head is in free state and the contacts are closed when the electrical appliance is working in normal condition. When the ambient temperature raises to the preset operating temperature, the contacts close as the plastic head deforms to jump when being heated, then the circuit is cut off to control the temperature . Then the contacts will close automatically to cut on the circuit when the electrical appliance is cooled down to the reset temperature. Widly used in home appliance's motor and electrical equipment, such as air conditioner motor, transformer, thermal appliances, etc.