XTE-411 Defender Thermostat RUFFNECK Defender XT‑411 is engineered for the most demanding applications such as drilling rigs, utilidors and compression stations where dirt, fluctuating power and high-impact conditions exist. It is considered the most robust and trouble‑free thermostat in the market due to its solid construction. The RUFFNECK Defender XT‑411 thermostat is for heating only and is suitable for ventilation systems in demanding industrial applications. It is designed for use in hazardous locations where specific explosive gases or dusts are present. The RUFFNECK Defender XT‑411 thermostat is the only available explosion‑proof thermostat for line voltage or pilot duty for up to 600 Vac. Color: Silver/Black.