Barksdale D1H-A3 Pressure Switch

The Barksdale D1H-A3 pressure switch is a housed diaphragm switch offering a single, externally adjustable setpoint from 0.03 to 3 psi, ideal for low‑pressure control in pneumatic and instrumentation circuits. It features a 1/4" NPT female pressure connection, SPDT relay options (with hermetically sealed variants available), and a rugged NEMA 4/4X (and 13) enclosure rating with IP65 protection for demanding environments. The unit is UL and CSA approved and can be configured with optional wire‑length extensions (Wxxx) and external adjustment—attributes that suit compact control panels and space‑constrained installations where a reliable, repeatable actuation point is required. As part of Barksdale’s D1H family, this model combines tight low‑pressure calibration with a compact, durable package that can serve as the sensing/actuation element in low‑pressure cut‑in or alarm applications across HVAC, pneumatic systems, and process instrumentation.