ABB TU841 3BSE020848R1 Redundant ModuleBus Termination Unit

Description

The TU841 3BSE020848R1 provides fault-tolerant architecture by housing two independent communication modules on a single passive backplane. If one module fails, the redundant unit takes over the data traffic, keeping the I/O station operational. It routes the ModuleBus internally and offers terminal points for dual power supplies, improving electrical reliability. Designed for long-term stability, the unit has no active components, maximizing MTBF. The TU841 mounts on DIN rails and features mechanical keying to ensure safe and correct module installation.

Specifications

• Manufacturer: ABB

• Model Number: TU841 (3BSE020848R1)

• Product Type: Redundant Module Termination Unit (MTU)

• Redundancy Support: Dual CI810 / CI820 Communication Modules

• Input Voltage: 24 V DC (Dual inputs supported)

• Max Current: 5 A

• Bus Type: ModuleBus (Internal)

• Mounting: 35mm DIN Rail

• Protection Class: IP20

• Operating Temperature: -25 to +70 °C

• Weight: 0.54 kg

Features

• Redundant Interface Housing: Optimized for dual communication modules to eliminate single points of failure in the control network.

• Passive Backplane Design: Increases system durability by utilizing a hardware-only routing base with no active electronics to fail.

• Live Module Replacement: Supports hot-swapping, allowing technicians to replace a faulty communication interface while the process continues to run.

• Dual Power Feed: Accommodates two separate power sources to maintain system integrity in the event of a power supply unit failure.

• Safety Coding Pins: Features integrated mechanical keying to ensure hardware compatibility and protect against incorrect module insertion.

• Compact DIN Rail Installation: Provides a high-density solution for redundant bus management within a small cabinet footprint.