Technical features: The aviation airproof technology is advanced at home. Upon making vacuum inside temperature-sensitive probe, the inert gas is injected to effectively avoid arc generation at contact, the reliability of movement of moving contact, under guarantee of QS9000 quality system. Main purposes: Utilize overseas high-quality dished dual metallic piece as temperature gathering element, make thermal protector and electromagnetic clutch of cpmpressor in series, control disconnection and connection of clutch according to the detected temperature change of body of compressor and take the action of safe protection to water tank of car