135 To 175 PSI Air Compressor Pressure Switch With Pumptrol Unloader Valve And On Off Switch Heavy Duty Grey 100 To 200 PSI Adjustable For Two-Stage Compressors
✔️ 135-175 PSI range, single unit, unloader valve, 1/4" NPT sensing port
This pressure switch is a heavy-duty control designed for two-stage air compressors, delivering automatic on/off cycling at preset pressures and an unloader option for easier restarts. It’s a handy fit for shop and industrial air systems that require reliable pressure management.
✅ Preset On Pressure: 135 PSI, Off Pressure: 175 PSI, Diff: 40 PSI
✅ Built-in unloader valve for load-free startup
✅ 1/4" female NPT pressure sensing port (approx 1/2" diameter)
✅ Unloader connection port: 1/4" compression for copper or high-pressure tubing
✅ Works with single or three-phase power, 110-575 V options
✅ 15 A continuous current rating
💡 What is a pressure switch with unloader valve and how does it help an air compressor system? This handy device helps manage pressure in a variety of systems. - It turns the compressor on and off at preset pressures to protect the motor - The unloader valve helps ease startup by releasing head pressure - The 135-175 PSI range is adjustable to fit your tank and tools - Works with single or three-phase power across a wide voltage range