Packard PHP600475 High Pressure Control Switch Open 600 PSI Close 475 PSI

The Packard PHP600475 is an automatic-reset high pressure control switch designed for use in air conditioning, heat pump, and refrigeration systems. It opens the circuit on rising pressure at 600 PSI and automatically resets (closes) at 475 PSI, with a tolerance of ±15 PSI, providing reliable compressor protection against high-side pressure excursions.

Key Features:

• Open Pressure: 600 PSI | Close Pressure: 475 PSI (±15 PSI tolerance)
• Automatic reset — no manual intervention required after pressure normalizes
• SPST contact form, opens on pressure rise to protect compressor
• ¼" Female SAE 45° flare fitting with valve core depressor for direct system mounting
• Rated for 24V, 120V, and 240V AC @ 50/60 Hz
• Maximum operating pressure: 700 PSI | Burst pressure: 2,800 PSI
• Operating temperature range: -31°F to 149°F (-35°C to 65°C)
• Snap-acting, hermetically sealed stainless steel pressure sensor
• Rated for 100,000 cycles at rated load for long service life
• NEMA 1 rated enclosure
• 18 AWG hardwired leads, 18" in length
• Compact and lightweight for direct inline mounting

The PHP600475 is a widely used OEM-replacement high pressure control compatible with a broad range of HVAC/R and refrigeration equipment. It is an industry-standard component stocked by major HVAC distributors and is interchangeable with comparable switches such as the Supco SHP600475.