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Dayton pressure switch, compact metal housing, 1/4 inch FNPT port, Auto/Off lever, CSA UL listed

Dayton

Dayton Pressure Switch 20/40PSI Auto/Off

SKU CH-R3P0-AQ2CX

Controls water-pump operation with a 20/40 psi auto/off setting and a 15-50 psi differential range

  • Product typeLight Switch
  • Auto/Off action simplifies pump control
  • 20/40 psi factory settings cover common water systems
  • Adjustable 10–100 psi range suits varied pressure needs
  • DPST contacts handle 120 V 1 1/2 hp and 240 V 2 hp motors
  • CSA certified and UL listed for safety compliance

Dayton 20/40 PSI Pressure Switch

The Dayton pressure switch controls water-pump operation with a factory-set 20/40 psi on/off range. It uses a DPST contact form and a single 1/4 in FNPT port for direct plumbing connection. The unit is CSA certified and UL listed for residential or light-commercial well systems.

Manual Auto/Off Lever Changes Daily Use

A manual Auto/Off lever lets the user disable the pump without cutting power at the breaker. This simplifies seasonal shutdown, leak testing or filter changes because the switch stays wired while the pump remains off. The lever does not alter the factory pressure settings or the differential range.

Standard Action Limits Adjustment Flexibility

The switch operates on a fixed standard action with a 15 to 50 psi differential and an overall 10 to 100 psi range. Motor ratings are 1-1/2 hp at 120 V and 2 hp at 240 V single phase. NEMA 1 rating and a -22 to 250 °F temperature range restrict use to indoor, non-hazardous environments.

How it compares

Measured against everything we stock in Electrical Switches & Dimmers, at today’s prices. Recalculated every night.

Price $23.99
Cheaper than about 73% of the 791 comparable items (median $39.99).

Specifications

Product
Brand nameDayton
Product typeLight Switch

Questions about this item

Will the 1/4 in FNPT port or the internal diaphragm need periodic replacement?

The switch uses a standard 1/4 in FNPT port and a DPST contact set; no user-serviceable diaphragm is referenced, so only the port seal may need attention if it leaks.

What pressure limit stops the pump first during continuous cycling?

The factory on/off setting is 20/40 psi with a maximum range of 100 psi, so the 40 psi cut-out is the first limit reached under sustained operation.

How much heat does the switch generate when the pump runs all day?

The switch is rated for -22 to 250 °F ambient temperature and carries up to 2 hp at 240 V; it adds negligible heat because it only makes and breaks the motor circuit.

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