Alco Controls PS3-W6S Pressure Switch

Alco Controls PS3-W6S Pressure Switch is a fixed-setting, automatic high‑pressure switch from the PS3 family designed to protect refrigeration and HVAC equipment by opening or closing contacts when pressure reaches a preset threshold. It uses a 7/16"-20 UNF female connection with a Schrader depressor and snubber for direct mounting or integration with standard accessories. The W6S variant provides a fixed setpoint pair of 16.0 bar (cut‑in) and 21.0 bar (cut‑out), supports a maximum operating pressure up to 45 bar, and withstands a test pressure of 50 bar, with an ambient rating up to +70°C. This model is commonly applied for condenser and compressor protection in industrial refrigeration and air‑conditioning systems, and its auto‑reset configuration (W type) enables automatic recovery after a fault without manual intervention.