ABB SD821 DIN Rail Mounted Power Supply Module

The ABB SD821 DIN Rail Mounted Power Supply Module delivers a regulated 5V DC system supply from a 24V DC input to power ABB control‑system components in industrial automation. Designed for ABB AC800M control systems, PLC panels, DCS environments, and process automation equipment, it supports parallel operation for redundancy and provides up to 5 A of output current. In ABB AC800M control systems and broader DCS architectures, the SD821 maintains a stable 5V rail for PLCs, I/O modules, and process instrumentation. Key specifications include 24V DC input, 5V DC output, up to 5 A, IP20 protection, DIN rail mounting, operating temperature 0°C to +55°C, storage -40°C to +70°C, and protection features such as overload, short circuit, and overvoltage protection. Its CE and UL compliance supports integration in compliant facilities. Common replacements include ABB SD822, ABB SD823, and Siemens SITOP PSU100S, enabling straightforward substitution in compatible ABB AC800M and DCS environments.