Allen-Bradley 810-A17C Inverse Time Current Relay

Allen-Bradley 810-A17C Inverse Time Current Relay is a magnetic motor protection relay that provides adjustable inverse-time overcurrent protection for industrial motors, feeders, and control circuits. It monitors circuit current and trips after a time delay that decreases as the magnitude of the overcurrent increases, protecting motors from sustained overload while allowing normal starting currents. Used in motor control centers (MCCs), conveyor systems, pumps, compressors, process equipment, and broader industrial automation where dependable motor overload protection is required, the 810-A17C is part of Allen-Bradley’s Bulletin 810 series and supports AC and DC motor control applications requiring adjustable inverse-time protection. Key specs include: Maximum system voltage 600 VAC / 600 VDC; Maximum continuous coil current 108 A; AC tripping current adjustment range 57–162 A; DC tripping current adjustment range 51–153 A; Frequency 25, 50, or 60 Hz; Contact configuration 1 normally closed (NC), automatic reset (standard); Contact rating NEMA A600; Mounting style panel mount; Protection function: adjustable inverse-time overcurrent protection; Time delay: adjustable via a silicone fluid dashpot. Common replacements include Allen-Bradley 810-A16C, 810-A18C, and 810-B17C. This unit is frequently specified by maintenance teams and system integrators for OEM replacement, retrofit projects, and motor protection upgrades.