Ashcroft D420V-XUD Snap Action Switch

Ashcroft D420V-XUD Snap Action Switch is a differential pressure switch in Ashcroft’s D-Series that uses a snap-action electrical switching element to convert differential pressure into a precise, repeatable control signal for process systems, enabling automated responses when the sensed pressure difference crosses a defined threshold. The XUD suffix denotes stainless steel pressure connections, an option Ashcroft lists in its Ordering Handbook to broaden compatibility with demanding media and piping configurations, helping maintain integrity of the pressure path in challenging environments. Designed for rugged industrial environments, D-Series switches are described in Ashcroft’s European materials as having weatherproof, corrosion-resistant enclosures, with NEMA 4X variants documented for harsh service, outdoor installations, and areas with washdown requirements. The model uses a standard SPDT switching arrangement to deliver normally open and normally closed outputs for interfacing with controllers, relays, or alarms, and the snap-action mechanism provides rapid actuation with defined switching points across service cycles.