Heavy Duty Pressure Switch LF10-4H for Air Compressor 135-175 psi

Heavy Duty Pressure Switch LF10-4H for air compressors delivering 135-175 PSI control with a four-port manifold and 1/4 NPT connection plus unloader option.

Designed as a universal replacement for small electrically driven air compressors, this Heavy Duty Pressure Switch provides reliable tank pressure control between preset values. It includes a 1/4 inch line that runs to the check valve or head for convenient plumbing, and the four-port manifold simplifies mounting and offers space for future additions such as a relief valve or gauges. Suitable for both single stage and two-stage compressors, the LF10-4H is factory-set to a 135-175 psi cut-in and cut-out range, delivering predictable performance in everyday workshop setups.

Adjusting the pressure is straightforward: turn the dial clockwise to raise both cut-in and cut-out pressures, or to raise cut-out pressure only. The unit ships preset to turn on at 135 psi and shut off at 175 psi, providing safe, automatic operation once installed. An optional unloader valve helps prevent starting under load, making startup smoother for compressors that begin under heavier load. With its four-port base and 1/4 inch NPT female connection, this switch supports easy mounting and compatibility with gauges or additional outlets in real-world setups.

Features:

• Size and connections: 6.3 mm unloader valve connection and 1/4 inch NPT Female connection
• Factory-set cut-in and cut-out range 135-175 PSI
• Four-port manifold enables versatile mounting and future additions
• Built-in On/Off lever and side-mounted unloader simplify control and mounting
• Preset to operate at 135 psi on and 175 psi off for safe operation