ABB TU840 3BSE020846R1 Redundant MTU Module Termination Unit

Description

The TU840 3BSE020846R1 ensures redundant ModuleBus communication by supporting two communication interface modules. If one fails, the secondary unit maintains the data link between the controller and I/O cluster. It distributes power and signals across the internal bus without interruption. Built with industrial-grade materials, the TU840 features a passive backplane to minimize electronic failure risk. Designed for DIN rail mounting, it includes mechanical keying for correct module placement and dedicated termination points for power and housekeeping signals, making it a central hub for high-availability S800 I/O clusters.

Specifications

• Manufacturer: ABB

• Model Number: TU840 (3BSE020846R1)

• Product Type: Redundant Module Termination Unit (MTU)

• Redundancy Support: Dual Communication Interfaces (CI810/CI820)

• Max Voltage Rating: 30 V DC

• Max Current Capacity: 5 A

• Connection Interface: ModuleBus (Redundant)

• Mounting: 35mm DIN Rail

• Environmental Protection: IP20

• Operating Temperature: -25 to +70 °C

• Weight: 0.55 kg

Features

• Dual Interface Support: Specifically designed to house two communication modules, enabling seamless failover for high-priority industrial networks.

• Passive Reliability: The lack of active electronic components on the termination unit itself ensures a high Mean Time Between Failures (MTBF).

• Fault Tolerant Architecture: Protects the I/O cluster communication by isolated routing of internal bus signals across redundant paths.

• Serviceability: Allows for the hot-swapping of communication modules, meaning a faulty unit can be replaced while the system remains fully operational.

• Compact Integration: Consolidates power distribution and communication bus routing into a single DIN-rail mounted footprint, saving cabinet space.

• Safe Configuration: Integrated mechanical coding prevents the accidental insertion of incorrect module types, safeguarding the hardware and process logic.