ABB DO820 Digital Output Relay Module

Description

The ABB DO820 Digital Output Relay Module (model 3BSE008514R1) is a specialized component for industrial automation and process control systems, designed to convert control system digital signals into switchable relay outputs for external devices. It features 16 isolated relay output channels (some variants offer 8 channels) with a maximum output current of 2A to 3A per channel, supporting AC 230V and DC 24V rated voltages to accommodate diverse high-voltage and low-voltage loads. With a fast response time of less than 10ms, the module ensures rapid signal switching for time-sensitive operations. Key features include individual channel current isolation for enhanced electrical safety, LED status indicators for simplified diagnostic and maintenance tasks, and a modular design fully compatible with the ABB S800 I/O series for seamless system integration. It supports flexible installation via DIN rail or rack mounting, and can be paired with module terminating units including TU811, TU813, TU831, TU836, TU837, and TU851. Ideal applications cover process control in factory automation, power system control for circuit breakers, relays and alarm systems, and building automation for lighting, HVAC and other building control equipment.