Switch 29PSL012-40 Manual Reset Pressure Switch Snap-Acting

Description:

The Switch 29PSL012-40 Manual Reset Pressure Switch is a manual-reset, snap-acting pressure switch designed to provide high-pressure safety cutout protection in HVAC and refrigeration systems. Commonly installed in unitary air conditioners, heat pumps, rooftop units, refrigeration equipment, and commercial cooling systems requiring a hermetically sealed manual-reset pressure switch. HVAC technicians and maintenance personnel use this switch for replacement of failed high-pressure safety controls, preventive maintenance, and restoration of reliable system protection.

Applications:

The Switch 29PSL012-40 Manual Reset Pressure Switch is commonly used as an upper-limit safety control in commercial and residential air conditioning, refrigeration, and heat pump systems. Its trip-free manual reset mechanism prevents equipment restart until system pressure returns below the reset point, helping protect compressors and refrigeration components from damage caused by excessive discharge pressure.

Technical Specifications:

• Part Number: 29PSL012-40
• Product Type: Manual Reset Pressure Switch
• Switch Type: Snap-Acting, Single Pole Single Throw (SPST)
• Contact Configuration: Normally Closed
• Reset Type: Manual Reset (Trip-Free)
• Operating Pressure Range: 200–750 PSIG (factory calibrated)
• Proof Pressure: Up to 800 PSIG (depending on setpoint)
• Burst Pressure: 5,000 PSIG
• Electrical Rating: 375 VA at 120 VAC; 6 A IND at 240 VAC
• Pressure Connection: Application dependent (SAE flare, NPT, or capillary options)
• Application: HVAC and refrigeration high-pressure safety control
• Designed for continuous-duty industrial and commercial HVAC applications.

Common Replacements:

• Sensata Technologies 29PSL012-40 Manual Reset Pressure Switch
• MARS 43313 (29PSL012-457) Manual Reset High Pressure Switch
• Sensata 29PSL012-206 Manual Reset Pressure Switch