The safety pumpset switchgear is enclosed in a special watertight metal casing and it manages three vacuum pumps, each with a power up to 3 KW, or from 4 to 7.5 KW and it automatically maintains the vacuum level, set with......The safety pumpset switchgear is enclosed in a special watertight metal casing and it manages three vacuum pumps, each with a power up to 3 KW, or from 4 to 7.5 KW and it automatically maintains the vacuum level, set with the vacuum switches, in the tank. It is equipped with fuses, three remote control switches with thermal protection, a transformer for low voltage auxiliary command power supply, an automatic time-set inverter, electrical connection terminal blocks and, on the control panel, a main switch with door-opening unit, line indicator lights and pump service, three change-over switches for manual or automatic operation, an alarm device with sound and light signal, alarm-test buttons and three hour-counters for measuring the actual pump operation time. These switchgears normally provide for the operation of one pump, with subsequent automatic insertion of the other two for larger consumptions and when, for whatever reason, the plant vacuum level goes below the preset value. An automatic time-set inverter, accurately alternates the start-up of the pumps, so that they are both subject to the same mechanical wear. The switchboard and the remote alarm systems start up when the plant vacuum level goes below the set minimum safety level