Allen-Bradley 634486A-90 Memory Circuit Board

Allen-Bradley 634486A-90 Memory Circuit Board is an open-style, mountable memory module designed for the Allen-Bradley 1336 AC Drive family, serving as the drive’s dedicated memory board in a PC-board format. Manufactured by Allen-Bradley and listed as discontinued by the manufacturer, this memory board appears in multiple catalog listings for the 1336 AC drive, often described as a memory circuit board, PC board, or memory module. The component weighs 1.21 lb and is commonly described in surplus listings as an 8K processor memory module, underscoring its role as memory storage within the drive’s control electronics. In typical legacy installations, 634486A-90 is mounted inside the drive chassis to preserve program data and memory resources, aligning with its open-mountable design and board-level integration within the drive system.