This product is part of the Nema Pressure Switches range, an offer of electromechanical vacuum switches. This electromechanical vacuum switch has 2 (normally closed - normally opened), DPDT (double pole double throw), form ZZ, snap action contacts and maximum pressure of 100psi. The vacuum switch with an approximate differential at minimum range of 1inHg to 9inHg and approximate adjustable differential at mid range of 1.7inHg to 7.4inHg. It is furnished with screw clamp terminals for electrical connection and 0.25inch 18 NPTF for fluid connection. This vacuum switch has a diaphragm actuator which can be operated from any position and adjustable differential scale for internal settings. Offers long mechanical life with a mechanical durability of about 5 million operating cycles. The enclosure is made of die cast aluminium alloy 380. It is available in size of 4.56inch (W) x 4.56inch (D) x 6.45inch (H) and weighs 4.6lb. It is suitable for pressure controlling or monitoring of water pumps, compressors, agricultural/irrigation water systems, moulding presses, injection moulders, grinding machines, machining centres, complex and special machines. It is a NEMA 4/4X/13 rated product. This product is certified by CSA and UL. Meets UL 508 standards. Vacuum switch has double throw contacts. Normally open and normally closed circuits allow the use of these controls for standard or reverse action applications. Standard controls can be mounted from the front using the bracket provided.