Product Overview

The ABB TU839 and TU836V1 are specialized extension units (Module Termination Units or MTUs) designed specifically for the ABB S800 I/O system. These units serve as the essential physical and electrical interface for the DO820 and DO821 16-channel relay output modules. The ABB TU836V1 (Ordering Number 3BSE021445R1) and its counterpart TU839 are engineered to handle the high current and voltage requirements typical of relay outputs, providing a robust connection point for field actuators such as motor starters, solenoid valves, and indicator lights.

In a complex automation architecture, the ABB TU839 / TU836V1 plays a critical role in signal distribution and power management. Unlike standard digital input bases, these extension units are designed to accommodate the specific pinout and power needs of relay modules. They feature an extended design to house the necessary terminal blocks and fuse holders (often referred to as “insurance” in technical translations), ensuring that the output circuits are protected against short circuits and overloads. By securely mounting the DO820 or DO821 modules, the ABB TU836V1 ensures reliable switching operations, making it indispensable for discrete control applications in manufacturing and process industries.