The 66F090 is a subminiature bimetallic thermostat from the Airpax 6600 series designed for accurate temperature sensing and switching in a single device. It features an 8-pin DIP package conforming to international standards, gold-plated contacts, and RoHS compliance per EU directive 2002/95/EC. The thermostat provides positive snap action with either close-on-rise or open-on-rise operation, achieving up to 30,000 life cycles at 120 VAC maximum standard amperage and up to 100,000 life cycles with gold contact amperage. Operating over a temperature range of 40°C to 130°C with ±5°C tolerance, it delivers switch capability up to 1 amp at 48 VDC or 120 VAC, and low-level switching down to 0.001 A at 5 VDC. The device is ideal for space-constrained applications on printed circuit boards and is commonly used in computers, aircraft, automotive systems, and test equipment for functions such as indicator light control, alarm activation, and system shutdown circuits.