DO840 3BSE020838R1 Spare Part

The ABB DO840 (3BSE020838R1) is a 16-channel digital output module from the S800 I/O family, designed for supervised 24V DC current-sourcing loads in both single and redundant configurations . As part of ABB's System 800xA and AC800M ecosystem, this module delivers robust performance for demanding industrial automation applications requiring high reliability and advanced diagnostics. The DO840 features 16 current-sourcing output channels arranged in two isolated groups of eight, each with independent process-voltage supervision . Built-in protection mechanisms including current limiting, over-temperature protection, and inductive load suppression ensure stable operation even in harsh industrial environments.