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Small rectangular pressure switch with flare fitting and manual reset button

SUPCO

SUPCO SMR410 Pressure Switch Manual Reset HP Fan Cycling

SKU CH-R2E1-Q66H8

Manual-reset high-pressure switch for HVACR systems, rated 5.8 A at 120 V AC and 2.9 A at 240 V AC, operates from -31 °F to 149 °F with 1/4 in flare connection

  • Manual reset prevents automatic restart after high-pressure trip
  • Rated 2.9 A at 240 V AC and 5.8 A at 120 V AC for reliable switching
  • Operates from -31 °F to 149 °F across demanding HVAC environments
  • 1/4 in flare sample-line connection simplifies installation in refrigeration systems
  • CE and UL Listed for verified safety compliance

HVAC Pressure Switch Manual Reset

The SUPCO SMR410 is a pressure switch designed for air conditioning, heating and refrigeration systems. It provides manual reset high-pressure protection and fan cycling control for HVAC equipment. Technicians install it where a reliable safety cut-out is required.

Electrical Ratings and Temperature Range

The switch carries a 5.8 A rating at 120V AC and 2.9 A at 240V AC for switching capacity. It operates from a 6V, 12V or 36V DC input supply. Ambient limits extend from -31 Degrees F up to 149 Degrees F for year-round service.

Replaces Automatic Reset Switches

This unit replaces automatic reset switches when a manual restart after high-pressure trip is preferred for system safety. The jump is worth it when codes or service practice demand a deliberate reset before the compressor restarts. It is not suited for applications that require auto-restart behaviour.

Highlights

  • Manual reset prevents automatic restart after high-pressure trip
  • Rated 2.9 A at 240 V AC and 5.8 A at 120 V AC for reliable switching
  • Operates from -31 °F to 149 °F across demanding HVAC environments
  • 1/4 in flare sample-line connection simplifies installation in refrigeration systems
  • CE and UL Listed for verified safety compliance

Specifications

BrandSUPCO

Questions about this item

Will the 1/4 in flare connector thread onto the copper service lines already on my RV's roof-top AC?

The switch uses a 1/4 inch flare sample-line connection, which matches the standard Schrader access port found on most RV air-conditioning and refrigeration circuits.

How can I confirm the manual-reset high-pressure cut-out is functioning after I wire it to the 12 V DC control circuit?

Press the reset button, apply power, then use a regulated nitrogen source to raise pressure past the trip point; the contacts should open and stay open until the button is pressed again.

Does the box include the mounting bracket and wire terminals, or do I need to order them separately?

The switch ships as the pressure-switch body only; mounting hardware, electrical connectors and any required tubing or flare nuts are not included and must be sourced separately.

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