Supco SLP0520 Pressure Switch

5 Open PSI (CUT-OUT), 20 Close PSI (CUT-IN), Low pressure switch, Open on Pressure Drop, SPST

SLP0520 is the updated version for 5731

Supco SLP0520 Low Pressure Switch | 5 PSI Cut-Out / 20 PSI Cut-In | SPST

The Supco SLP0520 Pressure Switch is a high-precision low pressure safety switch designed for reliable protection and control in HVAC and refrigeration systems. This non-adjustable, SPST (single pole, single throw) switch opens on pressure drop at 5 PSI (cut-out) and automatically resets when pressure rises to 20 PSI (cut-in), helping prevent system damage caused by low refrigerant pressure.

Built with a snap-acting stainless steel hermetically sealed sensor, the SLP0520 delivers dependable performance, long service life, and broad refrigerant compatibility—including A2L refrigerants. Its compact, direct-mount design with a ¼" SAE 45° female flare fitting and valve core depressor allows for quick and secure installation.

Key Features & Benefits:

• Low pressure switch – opens on pressure fall

• Cut-Out: 5 PSI | Cut-In: 20 PSI

• Automatic reset for reliable operation

• SPST, non-adjustable design

• Compatible with HFC, HCFC, CFC, and A2L refrigerants

• Snap-acting stainless steel, hermetically sealed sensor

• ¼" SAE female flare fitting (45°) with valve core depressor

• 18 AWG wire, 18" long

• 100,000 cycles life at rated load

• High burst pressure rating for safety

Electrical Specifications:

• Rated Voltage: 24 / 120 / 240 VAC @ 50/60 Hz

• DC Voltage: 6 VDC / 12 VDC / 36 VDC

• Maximum FLA:

  • 5.8 Amps @ 120 VAC

  • 2.9 Amps @ 240 VAC

• Maximum LRA:

  • 34.8 Amps @ 120 VAC

  • 17.4 Amps @ 240 VAC

Environmental Specifications:

• Ambient Temperature: -22°F to 275°F (-30°C to 135°C)

• Fluid Temperature: -4°F to 302°F (-20°C to 150°C)

• Burst Pressure: 5,000 PSI

• Pressure Tolerance: ±5 PSI

Product Details:

• Brand: Supco

• Model: SLP0520

• Product Type: Low Pressure Switch

• Function: Open on pressure drop

• Close PSI: 20 PSI

• Open PSI: 5 PSI

• Approvals: UL® Recognized, CE®

• Condition: Brand New

Applications:

• HVAC systems

• Commercial and residential refrigeration

• Air conditioning units

• Compressor protection and safety controls

⚠ Proposition 65 Warning:
This product may expose you to chemicals known to the State of California to cause cancer or reproductive harm.

The Supco SLP0520 Low Pressure Switch delivers dependable safety protection, broad refrigerant compatibility, and long-lasting performance—making it a trusted choice for HVAC and refrigeration professionals.