ABB TU851 3BSE068782R1 S800 I/O Module Termination Unit (MTU)

Description

The TU851 3BSE068782R1 mounts and connects S800 I/O modules to a DIN rail, acting as a passive distribution hub for field signals to the internal ModuleBus. It features 16 screw terminals for secure 2-wire connections per channel. A mechanical keying system ensures only compatible modules are inserted, preventing electrical mismatch. The unit supports hot-swapping of I/O modules, allowing quick maintenance and replacement without disrupting field wiring or controller bus operation.

Specifications

• Manufacturer: ABB

• Country of Origin: Estonia / Sweden

• Model Number: TU851

• Order Number: 3BSE068782R1

• Product Type: Module Termination Unit (MTU)

• Weight: 0.38 kg

• Terminal Capacity: 16 screw-type termination points

• Maximum Voltage: 50 V DC

• Current Rating: 2 A per channel maximum

• Wiring Interface: 0.2 to 2.5 mm² (24-12 AWG)

• Mounting Configuration: 35mm standard DIN rail

• Dimensions: 120.5 mm x 64 mm x 110 mm

Features

• Optimized Field Interfacing: Features 16 high-quality screw-clamp terminals designed for reliable 2-wire signal termination in compact cabinet layouts.

• Internal ModuleBus Link: Provides a seamless electrical backplane for high-speed data exchange between the mounted I/O module and the AC 800M controller.

• Hardware Safety Keying: Integrated physical coding pins ensure that only the correct module type can be seated in the base, eliminating electrical mismatch risks.

• Hot-Swap Functionality: Supports live module replacement, allowing technicians to service or upgrade hardware without powering down the station or disturbing field wiring.

• Vibration-Resistant Design: Built with industrial-grade materials to ensure stable electrical contact in environments subject to continuous mechanical stress.

• Enhanced MTBF: Designed as a passive component with no active electronics on the base unit, maximizing long-term reliability and reducing failure points.