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.

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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

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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

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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

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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

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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.

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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.