Industrial 29PSL012-40 Manual Reset Pressure Switch

The 29PSL012-40 Manual Reset Pressure Switch is a rugged, snap-acting SPST (normally closed) switch designed to provide high-pressure safety cutout protection in HVAC and refrigeration systems. Its trip-free manual reset prevents a restart until the system pressure falls below the setpoint, making it suitable as an upper-limit safety control in commercial and residential air conditioning, heat pumps, rooftop units, and refrigeration equipment that require a hermetically sealed manual-reset switch. Factory-calibrated for an operating pressure range of 200–750 PSIG (with proof pressure up to 800 PSIG depending on setpoint) and a burst pressure of 5,000 PSIG, it offers reliable protection for compressors and refrigeration components. Electrical ratings are 375 VA at 120 VAC or 6 A IND at 240 VAC, and pressure connections can be SAE flare, NPT, or capillary, depending on the installation. Designed for continuous-duty industrial and commercial HVAC applications, the 29PSL012-40 is a common replacement choice for Sensata Technologies 29PSL012-40, MARS 43313 (29PSL012-457), and Sensata 29PSL012-206 manual reset high-pressure switches.