DPA 500 IEC 400V ABB is likely a product name or model number of an electrical power supply system manufactured by ABB, a multinational corporation specializing in robotics, power, and automation technology.
Based on the naming convention, it seems to be a power supply system with a capacity of 500 kilowatts (kW) that operates at 400 volts (V) according to the International Electrotechnical Commission (IEC) standards.
DPA may stand for “Distributed Power Architecture,” which is a power system architecture used to provide high availability and redundancy in critical power applications.