... ControllerKTO 011:Thermostat (normally closed),contact breaker for regulating heaters.KTS 011:Thermostat(normally open), contact maker for ... . Thermostats and Hygrostats are used for the control of heaters, filter fans, heat exchangers and air conditioning equipment. ... Shanghai Saipwell Electric Co., Ltd. is a manufacturer of PTC heaters, Thermostats and all kinds of waterproof boxes with well ...