The 3MS100123023 is a military-grade thermostat from the 3MS1 QPL Series, functioning as a single-pole, single-throw (SPST) switch. It operates on 28 Vac/dc with a 5 A resistive load rating and is housed in a laser-welded, hermetically-sealed steel case with a glass-to-metal terminal seal. This device is qualified to MIL-PRF-24236, Type 1, Class 4, and can withstand significant environmental stress, including 100 G shock and 20 G vibration. The thermostat features an automatic reset and functions across an operating temperature range of -46°C to 190°C. Due to its robust, QPL-listed design, it is ideal for demanding applications in military aircraft and vehicles.