KSD9700 series thermal protector is highly sensitive bimetal element of the dish, the moving contact and static contact pad, fixed base, housing, temperature wire and other components. Bimetallic element at work in a free state, the moving contact and static contacts are closed, the circuit is turned on. When using electrical heating temperature rises due to failure to thermal protector operating temperature, the bimetallic element generates heat stress and rapid action, pushing the moving contact away from the fixed contacts and break the circuit, thereby cutting off the power supply from the electrical fault to protect the electrical effect. When the temperature drops to protect the electrical thermal protector rated reset temperature, the bimetallic element back to the initial state of contact closure, electrical resume normal operation. The product has a low resistance, thermal fast and prompt action, safety and reliability, small size and so on. For a variety of home appliances and electronic products. Such as motors, fluorescent lamp ballasts, battery chargers, transformers, cylindrical coil, electric steam bath, electric water heaters, office automation equipment, such as overheating protection.