ABB TU851 extension module termination unit

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ABB TU851 Extension Module Termination Unit – Product Information

1. Product Overview

The ABB TU851 is an extension module termination unit designed for ABB automation and control systems.
It provides reliable terminal connections and signal interfaces for control modules or extension I/O modules.
Its modular design enables easy installation, maintenance, and system expansion while ensuring signal integrity and safe wiring.

2. Technical Specifications

• Model: TU851

• Type: Extension Module Termination Unit

• Compatible Modules: ABB automation and control modules (e.g., AC500 PLC series)

• Terminal Type: Screw terminal

• Rated Current per Terminal: 10 A

• Rated Voltage: 300 V AC/DC

• Wire Size Range: 0.2 – 2.5 mm²

• Poles: Modular, expandable

• Mounting: DIN rail

• Operating Temperature: -25 ℃ to +70 ℃

• Storage Temperature: -40 ℃ to +85 ℃

• Protection Class: IP20

• Material: Flame-retardant engineering plastic

• Weight: Approx. 0.2 kg

• Certifications: CE, UL, RoHS

3. Features and Advantages

1. Modular design – Flexible expansion of I/O points.

2. Reliable connection – Screw terminals ensure tight and stable contact.

3. Space-saving – Compact design for neat wiring in control cabinets.

4. Quick installation – Easy DIN rail mounting and removal.

5. Durable and safe – Flame-retardant material and high mechanical strength.

6. High compatibility – Seamlessly interfaces with ABB automation modules.

4. Application Areas

• Industrial automation control systems

• PLC I/O module wiring

• Control cabinet wiring for machinery

• Power and energy management systems

• Factory process automation

• Smart building control systems

5. Precautions

1. Verify compatibility with control modules before installation.

2. Ensure power is off during wiring for safety.

3. Do not exceed rated voltage and current.

4. Regularly check terminal tightness for reliable contact.

5. Use protective measures in high humidity, dusty, or corrosive environments.

6. Do not disassemble the module casually to maintain system reliability.

The structure and details of the product：

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