The 30 in HG to Atm. Diaphragm Active Vacuum Switch includes: Adjustable setpoint, SPDT relay, 5 Amp @ 115 volts. Analog output of 0-1 VDC, Operates on 12VDC power, 200 mA. Switches shipped in the USA include an external wall mount style power supply with 115 VAC in/12 VDC out. Optional 220 V 50 Hz power supply available. Sensor not included, order sensors from 30 in HG to 150 PSIG Gauges.