Industrial ASR-75RA Variable Solid State Relay

The Industrial ASR-75RA Variable Solid State Relay is a 75 A power control device with an integrated potentiometer designed for proportional control of resistive loads in industrial heating and power regulation applications. Commonly installed in electric heaters, ovens, packaging machinery, plastic processing equipment, and industrial temperature control systems where smooth, adjustable power output is required, it enables operators to fine-tune output via the built-in potentiometer. This SSR supports phase angle or zero-cross switching technology to deliver adjustable AC power, and its input control is manual variable resistance/potentiometer. The solid-state design offers silent operation, fast switching speeds, and longer service life compared with electromechanical relays. Key specifications include rated current 75 A, load type resistive, output type AC switching, and a typical rated voltage of 24–480 VAC depending on model revision, with frequency 50/60 Hz and optical isolation. Mounting is panel-mount, and a heatsink is recommended for cooling. Protection features include overcurrent and overtemperature protection depending on installation. It is used by maintenance technicians, OEMs, and system integrators for equipment repairs, replacement of electromechanical relays, and upgrades to improve switching reliability and control accuracy in industrial heaters, ovens, heat sealing, drying equipment, and temperature control systems.