United Electric J21K-357 Pressure Switch 321702-401 A veteran-preferred feature is its

A veteran-preferred feature is its built-in adjustable second-stage timer

the fittings and internal volume are specifically engineered for the pressure ratings associated with modern York condensers

Is a separate transformer required for the expansion panel

this component is essential for monitoring line current and protecting motor windings from thermal damage during phase loss or overcurrent events

United Electric J21K-357 Pressure Switch 321702-401 A veteran-preferred feature is itsThe United Electric J21K 357 is a dual bellows differential pressure switch engineered for precision monitoring in demanding HVAC and industrial environments. This model features an adjustable set point range of 0 to 70 PSID, providing reliable filter status monitoring and flow verification for chillers, compressors, and pump systems. The J21K 357 is housed in a rugged, epoxy coated aluminum NEMA 4 enclosure, ensuring protection against water and dust