3BSE020850R1 | ABB | TU842 16-Channel Redundant MTU Unit

Product Description

High-Availability Redundant Module Termination

The TU842 (Model: TU842) is a high-performance redundant Module Termination Unit (MTU) engineered for the ABB S800 I/O system. Serving as the essential physical and electrical interface, the TU842 (Part Number: 3BSE020850R1) enables the connection of dual (redundant) I/O modules to a single process wiring set. This configuration ensures that if one I/O module fails, the secondary module maintains continuous process control without interruption. The unit features integrated terminal blocks for field wiring, process power distribution, and a robust ModuleBus interface, making it a cornerstone for high-availability industrial automation networks.

Detailed Technical Specifications

The TU842 (3BSE020850R1) is designed to meet rigorous industrial standards, providing secure termination for up to 16 channels in a compact, horizontally mounted frame.

• Manufacturer: ABB

• Model Designation: TU842

• Order Number: 3BSE020850R1

• I/O Configuration: Supports Single or Redundant I/O modules

• Number of Channels: 16 Channels (2 terminals per channel)

• Maximum Voltage: 50 V

• Current Rating: 3 A per I/O channel; 10 A maximum for process power connection

• Wiring Capacity: Solid: 0.2 - 4 mm²; Stranded: 0.2 - 2.5 mm² (24 - 12 AWG)

• Recommended Torque: 0.5 - 0.6 Nm (Stripping length: 7 mm)

• Isolation Test: 500 V a.c. dielectric test voltage

• Protection Class: IP20 (IEC 60529)

• Corrosion Resistance: ISA-S71.04: G3 (Harsh environment protection)

• Environmental Limits: 0 to +55 °C operating range; 5% to 95% non-condensing humidity

• Mechanical Dimensions: 186.5 mm (H) x 131 mm (W) x 64 mm (D)

• Net Weight: 0.6 kg (1.3 lbs)