TU842 ABB 3BSE020850R1 S800 I/O MTU 36 Screw Terminals

Product Overview

The ABB TU842 (3BSE020850R1) serves as a high-integrity Module Termination Unit (MTU) designed for the S800 I/O system. It provides the physical and electrical interface between field process signals and S800 I/O modules within ABB’s AC 800M and Symphony Plus architectures. By supporting redundant configurations, the TU842 ensures continuous signal flow even during hardware swaps or module failures. We supply this unit as 100% Brand New and Original in Factory Packing, providing the Swiss-engineered precision required for power generation and complex industrial control loops.

Technical Specifications

Engineering Advantages

• Redundant Path Assurance: The TU842 supports redundant I/O module pairs. This architecture allows the control system to maintain process visibility and control even if one I/O module malfunctions, facilitating Hot Configuration in Run (HCIR) capabilities.

• Integrated Noise Suppression: Every TU842 includes dedicated grounding terminals and an integrated shield connection for signal cables. This design effectively drains electromagnetic interference (EMI), protecting low-level analog signals from the high-frequency noise common in industrial motor control centers.

• High-Density Wiring Interface: The 36-point screw terminal block accommodates complex field wiring in a compact footprint. This density reduces the overall size of marshalling cabinets while providing clear, accessible termination points for maintenance technicians.

• Robust Environmental Tolerance: Built to withstand harsh process environments, the unit operates reliably from –25°C to +70°C. The rugged mechanical support structure prevents vibration-induced signal intermittentcy, ensuring a gas-tight connection for the lifetime of the system.

FAQs

Is the TU842 compatible with third-party I/O modules?

No. ABB designed the TU842 specifically for the S800 I/O family. It features a proprietary direct plug-in interface that aligns exclusively with ABB S800 I/O module connectors to ensure signal integrity and proper mechanical seating.

What are the grounding requirements for the TU842?

To achieve maximum noise immunity, you must connect the integrated shield bar to a clean instrument ground. Proper wiring discipline ensures that field-side interference does not enter the AC 800M controller backplane.

Does this unit support "Hot Swapping" of I/O modules?

Yes. When used in a redundant configuration, the TU842 allows you to replace a faulty I/O module without powering down the station or interrupting the process signal, provided the secondary module remains active.

What is the condition and warranty of this product?

We offer this product in New and Original factory condition. Every unit includes a 12-month factory warranty, ensuring performance and reliability in critical automation infrastructures.