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SUPCO SLP75100 low pressure switch, brass body, 1/4 in flare fitting, SPST, 75 psi

SUPCO

SUPCO SLP75100 Low Pressure Switch 75 psi SPST 1/4 in

SKU CH-RCXK-X8HEQ

A low-pressure switch that opens on pressure fall at 75 psi and auto-resets for HVAC systems

  • Automatic reset restores operation without manual intervention
  • Opens on pressure fall to protect low-limit systems
  • SPST contact form simplifies wiring for on/off control
  • 1/4 in flare connection fits standard HVAC lines
  • Rated for 24, 120 and 240 V AC across common supplies

Low-Pressure 75 psi Switch for HVAC Systems

The SUPCO SLP75100 is a fixed-setting low-limit pressure switch rated at 75 psi. It uses a SPST contact that opens on pressure fall and resets automatically. Rated for 24, 120 and 240 V AC, it suits residential and light-commercial HVAC controls. NEMA 1 rating limits it to indoor use.

1/4 in Flare Connection Simplifies Installation

The female flare fitting threads directly onto standard 1/4 in refrigerant service ports without adapters. Hard-wired electrical leads eliminate the need for separate terminal blocks or plug assemblies. Fixed 75 psi calibration removes field adjustment steps during commissioning.

Handles Low-Limit Protection on Small-Capacity

The switch reliably interrupts control circuits when suction pressure drops to 75 psi, preventing compressor damage from loss of charge or airflow. NEMA 1 enclosure and fixed setting restrict use to indoor, non-adjustable applications. Not suited for high-pressure cut-out, adjustable set-point or outdoor-rated requirements.

Highlights

  • Automatic reset restores operation without manual intervention
  • Opens on pressure fall to protect low-limit systems
  • SPST contact form simplifies wiring for on/off control
  • 1/4 in flare connection fits standard HVAC lines
  • Rated for 24, 120 and 240 V AC across common supplies

Specifications

BrandSupco

Questions about this item

Will the 1/4 in flare connection on the SLP75100 need periodic tightening or seal replacement?

The 1/4 in female flare fitting is a metal-to-metal seal; check for leaks at each service interval and replace the flare nut or copper washer only if seepage appears.

What limits continuous operation of the SLP75100 on a 240V AC circuit?

The SPST contacts are rated for 120V, 240V and 24V AC; sustained use is limited by the 75 psi fixed set-point and the NEMA 1 enclosure, which is not sealed against moisture or dust.

Does the SLP75100 generate audible click or measurable heat when cycling all day on 24V AC?

The switch produces a light mechanical click each time it opens on pressure fall and closes on automatic reset; contact resistance is low, so heat rise is negligible in normal HVAC control duty.

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