140-175 PSI, Heavy Duty American Made Air Compressor Pressure Switch, Includes Rotating Unloader and On Off Lever, Single 1/4" NPT Port, Made in USA

When used with smaller horsepower (HP) air compressors, the pressure switch monitors the air pressure in the compressor tank. It closes its electrical contacts to start the compressor when the pressure drops below a preset "cut-in" level and opens the contacts to stop the compressor when the pressure reaches the "cut-out" level. For larger HP air compressors, the pressure switch works in conjunction with a magnetic motor starter, integrated into the compressor’s control circuit to manage motor operation efficiently. When the tank pressure falls below the cut-in setting, the pressure switch closes its contacts, completing the control circuit and sending a low-voltage signal to energize the magnetic starter’s coil, initiating compressor operation. Air compressors without built-in head unloaders may require a pressure switch equipped with an unloader valve. When the pressure switch opens to halt the compressor, the unloader valve vents trapped pressure from the pump head, ensuring the motor restarts without load in the next cycle. These unloader valves typically connect via an air line to the check valve located at or near the receiver tank inlet. The 69JG Heavy Duty Hubbell pressure switch features a rotating unloader that can be mounted on the front or either side of the switch and adjusted to any of eight positions. This flexibility allows users to configure the switch to match the compressor system’s layout, eliminating the need to modify the system for a fixed unloader position. This adaptability is particularly valuable in space-constrained or complex industrial environments, reducing installation time and effort. Additionally, the 4-port manifold enables simultaneous connection of multiple components or accessories—such as safety valves, gauges, and fittings—minimizing the need for external piping or additional hardware, streamlining the system design. UL listed and CSA Certified. CE and CCC approved

• 140 - 175 PSI, Heavy Duty Hubbell Pressure Switch, Equipped with On / Off Lever, Side Unloader, 1/4" Female NPT Connection Port
• (69JG9LY) Factory Preset PSI 140-175, Pressure Switch Is Adjustable, Differential Range 30-40 PSI (Min. Close Cut-In 100 PSI) (Max. Open Cut-Out 175 PSI)
• 1/4" Compression Unloader Valve Connection. The Rotating Unloader Can Be Mounted On The Front Or Either Side Of The Pressure Switch And Rotated To Any Of Eight Different Positions.
• Equipped With Manual On / Off Lever Located On The Side. If Your Application Has Alternative Ways To Turning The Compressor On/off, Simply Leave In The On Position
• Rated For 120V / 240V For Single-phase Applications, Rated For 208V / 230V / 460V For Three-phase Applications When Wired To Control Voltage On A 3-Phase Motor Starter