ALCO Controls PSC-A5S Process Switch Controller

ALCO Controls PSC-A5S Process Switch Controller is a compact, pressure-sensing control device from Emerson Flow Control that functions as a process switch to initiate or interrupt circuits when a monitored pressure crosses a set threshold. The model is cataloged as 097854 and is described in distributor listings as SWITCH, TPC-PSC-A5S; this PSC-A5S variant belongs to Alco’s line of pressure controls used in HVAC and refrigeration equipment to manage compressors, pumps, and safety interlocks. Several vendors note the PSC-A5S as obsolete, with indications that replacement options may be available. Because precise electrical ratings, pressure setpoints, reset behavior, and connection details can vary by revision and installation, consult the official datasheet or a qualified technician to confirm compatibility with your control panel and system requirements. In practice, the PSC-A5S serves as a reliable, field-serviceable pressure-switch-based control solution within legacy Alco PS/PSC families, offering the robustness expected from Alco Controls’ long-standing refrigeration and HVAC control heritage.