Allen-Bradley 836-H33 XNAS Pressure Control Switch

Allen-Bradley 836-H33-XNAS Pressure Switch is a Style H, copper-bellows high‑pressure control used in refrigeration and HVAC systems to monitor pressure and actuate a control circuit on rising pressure. It provides a 75–350 psi operating range and is a single-pole, single-throw, normally closed switch that opens as pressure increases. This open-type switch relies on a copper alloy bellows sensor for durable sensing in demanding refrigeration environments and weighs about 0.67 lb. Electrical ratings support up to 600 V AC and up to 5 A, with typical control-load horsepower ratings around 1 HP at 115 V and 1.5 HP at 230 V. The 836-H33-XNAS is commonly employed to protect compressors and refrigerant circuits, offering a reliable setpoint for cut-in and cut-out in commercial refrigeration, air conditioning, and other HVAC equipment. As part of Allen-Bradley’s 836 family, this switch is designed for precise, repeatable operation in open, non-enclosed installations and interfaces with standard refrigeration control circuits.