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Square D 9013FH pressure switch, grey metal housing, single port, unload valve visible

SQUARE D

SQUARE D 9013FH Pressure Switch 135-175 PSI Unload

SKU CH-70JS-GM53N

Pressure switch for air compressors with 135-175 PSI factory settings and 40 PSI differential

  • TypeLight Switch
  • Controls air compressors up to 175 psi cut-out pressure
  • Handles 1.5 hp at 120 V single-phase motors
  • DPST contacts switch both lines for safety
  • NEMA 1 enclosure suits indoor installations
  • Adjustable 60-200 psi range fits many systems

Compressor control switch

The Square D 9013FH pressure switch manages air-compressor motors by opening and closing contacts at factory-set cut-in and cut-out pressures of 135 and 175 psi. It carries a DPST contact form rated for single-phase motors up to 1.5 hp at 120 V and 2 hp at 240 V, plus three-phase ratings of 3 hp at 240 V and 1 hp at 480 V. The 40 psi differential and 60 to 200 psi adjustable range suit typical workshop compressors. NEMA 1 enclosure rating indicates indoor use only.

Installation checks

Verify that the compressor tank port accepts a 1/4 in FNPS thread and that the unloader line matches the 1/4 in compression fitting on the switch. Confirm the motor voltage and phase match one of the listed horsepower ratings so the contacts are not overloaded. Ensure the wiring can accommodate a DPST switch action and that the mounting location meets the NEMA 1 indoor requirement. The switch uses standard action with no manual lever, so automatic pressure cycling is the only control method.

Build and daily use

The housing carries a NEMA 1 rating, meaning it is not sealed against water, oil spray or outdoor exposure. The single 1/4 in FNPS port threads directly into the tank fitting, while the integrated unloader port uses a 1/4 in compression connection for the bleed line. DPST contacts break both lines of the motor circuit for positive shut-off. Factory pressure settings of 135/175 psi are fixed unless the adjustment nuts are turned within the 60 to 200 psi range.

Highlights

  • Controls air compressors up to 175 psi cut-out pressure
  • Handles 1.5 hp at 120 V single-phase motors
  • DPST contacts switch both lines for safety
  • NEMA 1 enclosure suits indoor installations
  • Adjustable 60-200 psi range fits many systems

Specifications

BrandSquare D
TypeLight Switch

Questions about this item

What comes in the box with the 9013FH pressure switch and what must I buy separately?

The switch ships as a single unit with a 1/4 in FNPS port and built-in unloader valve; pipe fittings, tubing and wiring are not included.

Which pressure range should I choose for a compressor that cuts in at 135 psi and cuts out at 175 psi?

The factory setting of 135/175 psi matches that requirement exactly, and the adjustable range spans 60 to 200 psi with a fixed 40 psi differential.

What does the 135/175 psi rating mean when the switch is installed on my air compressor?

The compressor motor will start when tank pressure falls to 135 psi and stop when it reaches 175 psi, giving a 40 psi operating band.

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