66F055 is a subminiature bimetallic disc thermostat from the Airpax 6600 series, designed for accurate and reliable temperature sensing and switching in a single device. This RoHS compliant thermostat features a close-on-rise (fan) contact operation with a factory-preset operating temperature of 55°C (±5°C tolerance), minimum differential of 4°C, and minimum reset temperature of 30°C. The device conforms to the 8-pin DIP package standard, making it ideal for PCB mounting with auto-insertion equipment, and is sealed for wave soldering and board washing operations. With gold-plated contacts, the thermostat achieves up to 100,000 life cycles at low-level switching and supports switching up to 1 amp at 48 VDC or 120 VAC. Common applications include computers, computer peripherals, aircraft, automotive, and test equipment for temperature monitoring, alarm triggering, and system shutdown control.