The hazardous locations 646VE Series is a rugged, heavy duty, all aluminum vacuum pressure switch. Similar to the 604 Series in design, the 646VE 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