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Square D 9012 pressure switch with 1/4 inch FNPT port

SQUARE D

SQUARE D 9012GRG5 pressure switch 3-150 psi

SKU CH-B116-3QHC9

Standard-action diaphragm pressure switch covers 3 to 150 psi with a 4.2 psi differential and NEMA 1 enclosure

  • TypeLight Switch
  • Reliable pressure control from 3 to 150 psi
  • Precise 4.2 psi differential for consistent actuation
  • SPDT contacts handle 3 A at 240 V AC
  • Diaphragm design operates from -40 to 250 °F media temperature
  • NEMA 1 enclosure suits indoor installations

Square D 9012GRG5 Pressure Switch

The Square D 9012GRG5 is a standard-action pressure switch built for controlling electrically driven water pumps and similar equipment. It covers a 3 to 150 psi range with a 4.2 psi differential and uses a diaphragm actuation mechanism. The single-pole double-throw contact block is rated for 3 A at 240 V AC and 0.22 A at 125 V DC. A 1/4-18 FNPT port connects directly to the pressure source.

NEMA 1 Enclosure and Temperature Limits

The switch carries a NEMA 1 rating for indoor use and operates in ambient temperatures from -10 to 185 degrees Fahrenheit. Media temperatures can reach -40 to 250 degrees Fahrenheit without affecting the diaphragm. No moving parts generate audible noise during normal cycling. Power draw is limited to the control circuit current passing through the contacts.

Replaces Worn Pump Controls

This unit replaces a failed or out-of-calibration pressure switch on existing pump systems that require the same pressure range and port size. The upgrade is worth it when the old switch no longer holds its cut-in or cut-out settings reliably. It is not suited for applications needing adjustable differential, multiple ports, or hazardous-location enclosures.

Highlights

  • Reliable pressure control from 3 to 150 psi
  • Precise 4.2 psi differential for consistent actuation
  • SPDT contacts handle 3 A at 240 V AC
  • Diaphragm design operates from -40 to 250 °F media temperature
  • NEMA 1 enclosure suits indoor installations

Specifications

TypeLight Switch
BrandSquare D

Questions about this item

How do I install the 9012GRG5 switch and what is the common mistake with the 1/4-18 FNPT port?

Thread the switch into a 1/4-18 FNPT fitting using pipe sealant on male threads only; the frequent error is applying tape to the switch's female port, which can block the diaphragm.

What maintenance will the diaphragm and contacts need over time?

Inspect the diaphragm for cracks or set after pressure cycles; clean or replace contacts if the 3 A @ 240 V AC or 0.22 A @ 125 V DC ratings become unreliable.

At what pressure difference does the switch reset during sustained cycling?

The fixed 4.2 psi differential determines the reset point; the contacts will not re-actuate until pressure falls 4.2 psi below the trip setting.

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