This SHP400300 high pressure switch is engineered for HVAC and refrigeration systems using HFC, HCFC and CFC refrigerants, with precise 400 PSI open and 300 PSI close setpoints that trigger on pressure rise. As an encapsulated, non-adjustable single pole-single throw switch with direct mount design, it features a SAE 45 female flare fitting with valve core depressor and automatic reset for reliable pressure regulation. Built with a snap acting stainless steel hermetically sealed sensor, 18 AWG 18" wiring and 24/120/240 VAC @50/60 Hz rating, it operates in -31°F to 149°F (-35°C to 65°C) with 700PSI max pressure and 100,000 cycle load life—compact, lightweight, with excellent set point repeatability for consistent system performance.