ABB TU842 3BSE020850R1 Terminal Unit (Base/Terminal)

The ABB TU842 3BSE020850R1 is a robust and compact terminal unit designed for field signal wiring in distributed control systems. Acting as a reliable interface between field devices and I/O modules, this base/terminal module forms a foundational part of ABB’s AC 800M controller system. The TU842 is compatible with various I/O modules and features screw-clamp terminals that provide secure, vibration-resistant connections, ideal for industrial applications with demanding environmental and operational requirements.

The TU842 simplifies system integration by offering structured cable management, standardized dimensions, and DIN-rail mounting. This unit is tailored for high-channel-density applications where long-term reliability and ease of maintenance are crucial. With its industrial-grade build and ABB’s engineering precision, the TU842 enhances system durability and minimizes wiring errors.

Product Parameters

Product Applications

The TU842 is designed to be the interface between I/O modules and field cabling in distributed control environments. It is primarily used in ABB’s AC 800M series and seamlessly integrates into various control cabinet configurations.

Typical Applications Include:

• Process Automation: Seamless interface in chemical, oil & gas, and pharmaceutical plants.

• Power Generation: Reliable base terminal for control systems in thermal and hydroelectric plants.

• Water Treatment Facilities: Long-term stable performance in damp, corrosive environments.

• Pulp & Paper Industry: Withstands continuous operation and mechanical vibrations.

• Manufacturing & Assembly Lines: High-density signal management for machinery integration.

Whether the environment is harsh or the space is constrained, TU842 provides a reliable and standardized way to connect field wiring with controllers.

Product Advantages

The ABB TU842 offers distinct engineering and operational advantages that elevate its performance above conventional base terminals:

• Compact, High-Density Design

  Fits up to 32 channels in a single base unit, optimizing control cabinet space without sacrificing accessibility.

• Secure Connections

  The screw-terminal design ensures strong mechanical fastening, minimizing risks of loose connections and vibration-induced failures.

• Easy DIN-Rail Installation

  Streamlines installation and replacement in industrial panels, reducing setup and service time.

• Wide Compatibility

  Supports a variety of ABB I/O modules, enhancing flexibility for system integrators and field engineers.

• Environmental Robustness

  Operates reliably in extreme temperatures and humidity ranges, suitable for outdoor and enclosed installations.

• Service-Friendly Layout

  Clearly marked terminals and modular assembly facilitate faster troubleshooting and signal tracing.

• Durable Materials

  Constructed from flame-retardant, shock-resistant plastic that ensures electrical safety and mechanical integrity.

Frequently Asked Questions (FAQ)

1. What type of wiring does the TU842 support?

It supports screw-terminal wiring for wires sized between 0.2 mm² and 2.5 mm² (24–12 AWG).

2. Is the TU842 compatible with all AC 800M modules?

Yes, it is fully compatible with a wide range of ABB S800 I/O modules.

3. How many channels does TU842 support?

The TU842 supports up to 32 channels, making it suitable for high-density applications.

4. Can it be used in high-vibration areas?

Yes, the TU842 is rated for vibration resistance of 1g across 5–500 Hz, suitable for industrial environments.

5. What are the environmental ratings?

It can operate from -20°C to +60°C, and storage conditions range from -40°C to +70°C.

6. Is this unit certified for use globally?

Yes, it carries CE, UL, and RoHS certifications, meeting international safety standards.

7. What type of installation does it support?

The unit is designed for standard DIN rail mounting, suitable for most control panels.

8. What tools are needed to wire the terminal?

Only a small flat-head screwdriver is required to secure the screw clamps.

9. Does it have shielding or grounding features?

While TU842 is primarily a terminal unit, grounding provisions are present based on system configuration.

10. What is the insulation resistance rating?

The insulation resistance is ≥100 MΩ at 500 VDC, ensuring electrical isolation and safety.