ABB 6638553A7 Power Supply is a Pentium 4-era ATX switching PSU in ABB's Ultra Win-300PS line, and it ships with a power cord (KK4). The product is listed as new in box, signaling a factory-sealed spare for ATX-configured desktops of that period. The part number places it in ABB’s 6638xxx family of power supplies, making it a targeted replacement for systems that specify 6638553A7. When replacing, confirm your motherboard and components are compatible with ATX power supplies of this vintage and that the KK4 cord matches your setup.
