ABB TU891 | 3BSC840157R1 | Compact Terminal Unit

Product Overview

The TU891 (3BSC840157R1) is a high-density, compact Module Termination Unit (MTU) engineered for efficient signal management within ABB S800 I/O systems. Designed for horizontal installation, this 8-channel unit serves as a robust foundation for field wiring, combining a space-saving footprint with reliable electrical connectivity for demanding industrial control environments.

Technical Specifications and Performance Data

This unit is designed for precision and reliability in cabinet space management, offering detailed mechanical and electrical parameters for integration.

• Model: TU891

• Part Number: 3BSC840157R1

• Channel Capacity: 8 channels

• Operating Voltage: 24V

• Maximum Current Rating: 2A per I/O channel

• Compatible I/O Modules: AI890, AI893, AI895, AO890, AO895, DI890, DO890

• Connection Interface: Terminal block with 27 gray terminals

• Dielectric Test Voltage: 500 V a.c.

• Process Connector Wiring: Solid 0.2–4 mm²; Stranded 0.2–2.5 mm² (24–12 AWG)

• Process Connector Torque: 0.5–0.6 Nm

• Power Supply Connector Wiring: 0.25–2.5 mm² (24–14 AWG)

• Power Supply Torque: 0.5–0.6 Nm

• Operating Temperature: Up to 55°C (131°F)

• Redundancy: Single I/O configuration

Mechanical Dimensions and Weight

The TU891 (3BSC840157R1) is designed to fit compactly within standard enclosures, minimizing the physical footprint of the control assembly.

• Width: 64 mm (1.77 in.) including connector; 58.5 mm (2.3 in.) edge-to-edge installed

• Depth: 58 mm (2.28 in.); 106 mm (4.2 in.) including terminals

• Height: 194 mm (7.6 in.) including latch

• Weight: 0.17 kg (0.37 lbs)