AUTOMATIC PRESSURE SWITCH Brand new, LEFOO automatic pressure switch for compressed air systems. Automatically turns electric motor ON or OFF at set values. Adjustable differential. Unloader port 1/4" OD copper tubing which allows compressor to start without back pressure load. Sturdy metal housing. Single port.
If I us a Magnetic Starter and I have a new 5 hp 2 stage Rol-Air Pump, is it still best to use a switch like this that has the unloader valve built in?
A: It is always best to use an unloader, so the motor doesn't have to start the compressor against pressure.
Date Submitted: 12/03/2018
Will this pressure switch work with a 5 horse motor?
A: It the starting current draw exceeds the 25 Amp limit of the switch contacts, the lifespan will be reduced. When used with true 5 Hp motors which can draw 22.5-25 Amps (230 VAC) while running, it is usually best to use a magnetic contactor that is controlled by the pressure switch.