ABB 64011821 Branch Unit

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Product Overview

ABB 64011821 Branch Unit
The ABB 64011821 is a high-performance branch unit designed for low-voltage distribution systems to provide circuit branching protection and current distribution. It can be used with switches, circuit breakers, or fuses to provide overload, short-circuit, and operational isolation protection. The unit features compact design and flexible installation, suitable for industrial, commercial, and infrastructure power distribution systems.

Technical Specifications

• Model: 64011821

• Product Type: Branch Unit

• Rated Current: 16–125 A (depending on model)

• Rated Voltage: AC 690 V / DC 500 V

• Poles: 1P / 2P / 3P / 4P (selectable according to system)

• Short-Circuit Breaking Capacity: 10–25 kA (depending on model)

• Mounting Method: DIN rail or panel embedded installation

• Protection Class: IP20 (optional additional protection)

• Operating Temperature: -25 ℃ to +60 ℃

• Standards: IEC 60947-3 / IEC 61439 series low-voltage switchgear standards

Advantages and Features

1. Reliable Branch Protection
   Provides overload and short-circuit protection for branch circuits, ensuring system safety.

2. Modular Design
   Flexible combination with multiple pole configurations according to needs.

3. Compact and Easy Installation
   Suitable for control cabinet and distribution board installation, saving space.

4. Easy Maintenance
   Modular structure allows easy replacement and expansion.

5. Industrial-Grade Reliability
   Designed to withstand high temperature, vibration, and harsh industrial environments for long-term stability.

Typical Applications

• Industrial low-voltage distribution systems

• Commercial and office building power distribution

• Power and energy management systems

• Machinery and production line power protection

• Infrastructure and transportation power systems

• Internal branch protection for distribution and control cabinets

Installation & Usage Notes

1. Ensure rated current, voltage, and branch requirements match the system before installation.

2. Follow wiring diagrams carefully and secure connections to prevent short circuits.

3. Avoid use in high humidity, corrosive gases, or dusty environments.

4. Regularly check branch unit and connection status to ensure protection functions are normal.

5. Disconnect system power before maintenance or replacement of the branch unit.