Barksdale D1H-A3 Pressure or Vacuum Actuated Switch

Barksdale D1H-A3SS is a housed diaphragm pressure switch with a single setpoint in the 0.03 to 3 psi range, designed to trigger on either positive pressure or vacuum. The D1H family uses a diaphragm sensor paired with a snap-action switch to provide a defined electrical change when the target pressure is reached, ensuring reliable signaling in control circuits. This model, designated D1H-A3SS, is factory preset for a fixed setpoint within that range and is commonly used in low‑pressure monitoring and interlock applications where compact size and dependable response are important. Typical installations involve low‑pressure lines or enclosures requiring a self-contained sensing element, and the 0.03–3 psi window makes it suitable for delicate vacuum control, bleed‑air regulation, or small‑pressure shutoff tasks in industrial or equipment settings.