The HONEYWELL part 21CX4 is a MICRO SWITCH™ Hazardous Location Switch that is designed for use in demanding environments. It features an epoxy-coated aluminum standard housing, making it durable and resistant to corrosion. The switch is operated using a side rotary mechanism and offers momentary action. It is equipped with four single pole double throw (SPDT) basic switches, allowing for versatile functionality. With a maximum current rating of 15 A and voltage rating options of 125, 250, or 480 Vac, this switch can handle a range of electrical applications. It is also rated for NEMA 1, 3, 4, 4X, 6, 6P, 13, and IP66 sealing, ensuring protection against dust, water, and other environmental factors. The operating temperature range of -25 °C to 85 °C [-13 °F to 185 °F] makes this switch suitable for use in both extreme cold and hot conditions. It features two 3/4 in - 14 NPT conduit terminations, allowing for easy installation and wiring. This switch is approved for use in hazardous locations, specifically NEMA 7: Class I, Div. 1 & 2, Groups C & D; NEMA 9: Class II, Div. 1 & 2, Groups E, F, & G. It is also certified by UL, CSA, and features an internal ground screw for added safety. Overall, the HONEYWELL part 21CX4 is a reliable and rugged switch that is suitable for use in hazardous environments, providing peace of mind and ensuring electrical control in demanding conditions.