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The hazardous locations 646TUE Series is a rugged, heavy duty temperature switch with a stainless steel capillary tube and armored jacket probe port fitting. Similar to the 604 Series in design, the 646TUE Series is rated to 15 Amps and UL/CSA explosion proof, Class I, Groups A, B, C and D, and Class II Groups E, F and G certified. It comes with high vibration and shock resistance utilizing Dual Snap® disc spring technology.