Reliance 78175-56A Drive Circuit Board Card

The Reliance 78175-56A Drive Circuit Board Card is a legacy Reliance Electric drive board cross-listed under the Reliance part number 78175-56A and also cataloged as Reliance Electric 0-51665 and 051665. This drive circuit board card functions as the circuit-board component inside a motor-drive assembly and carries multiple identifiers to support replacement in aging automation equipment. It represents the historical lineage between Reliance Electric and Reliance drive hardware, used in industrial control environments where these brands were paired. Typical applications for parts bearing these numbers include legacy drive systems in manufacturing and process automation that originally utilized Reliance Electric/Reliance hardware. When used as a spare part, it provides a replacement option to restore function for compatible drive chassis and controller configurations, without necessitating a full drive module replacement.