TU844 3BSE021445R1 | ABB | S800 I/O Redundant Termination Unit

Product Overview

The ABB TU844 (3BSE021445R1) functions as a high-integrity Redundant Module Termination Unit (MTU) within the S800 I/O ecosystem. It provides the essential physical and electrical interface for up to 8 channels, specifically accommodating AI845, AI880, AI880A, and DP840 modules. This unit enables seamless dual-module redundancy, ensuring continuous process data acquisition even if a single I/O module requires replacement or experiences a fault. We supply this component as 100% brand new original equipment to maintain the highest safety and performance standards of your Advant or 800xA control system.

Technical Specifications

The TU844 utilizes a specialized 40-point terminal block layout designed for secure process power distribution and signal integrity.

Engineering Advantages

• Fault-Tolerant Architecture: The TU844 hosts two redundant I/O modules simultaneously. This configuration eliminates single points of failure at the I/O layer, keeping your critical loops active during hardware maintenance.

• Streamlined Power Distribution: With 20 dedicated 0 V process power terminals and 4 dedicated process power points, this unit removes the need for external distribution blocks. This integrated design reduces cabinet clutter and minimizes potential wiring errors.

• Precision Signal Termination: The unit accepts a wide range of wire sizes (up to 12 AWG stranded). The robust screw-clamp terminals ensure a gas-tight connection, preventing signal drift in high-vibration or corrosive industrial environments.

• Thermal Management Optimization: The horizontal mounting profile facilitates natural convective cooling across the connected modules. This design maintains stable operation at ambient temperatures up to 55 °C (131 °F) without requiring external fans.

FAQs

• Which specific I/O modules can I use with the TU844?

  The TU844 specifically supports AI845, AI880, AI880A, and DP840. Always verify your module's firmware compatibility with the 800xA system version before installation.

• What is the correct installation torque for the terminal screws?

  Apply a torque between 0.5 and 0.6 Nm. Over-tightening can damage the terminal cage, while under-tightening leads to high contact resistance and intermittent signal loss.

• Does this unit support "Hot Swapping"?

  Yes. The Redundant MTU design allows you to remove and replace one of the two redundant I/O modules while the process remains energized and the secondary module continues to operate.

• Is this a genuine ABB part?

  We guarantee this is a 100% Brand New, original ABB 3BSE021445R1. It ships in factory-sealed packaging to ensure authenticity and longevity for your industrial control network.