Branching Unit for Small Busbars

Branching units, or tap-off units, allow safe and flexible power distribution from small busbars to individual loads, supporting modular installation and monitoring.

Overview

A branching unit (tap-off unit) is a device that connects a main busbar to secondary circuits or equipment, enabling power distribution without interrupting the main busbar. These units are commonly used in small busbar systems for industrial, commercial, or data center applications, where modularity, safety, and flexibility are essential .

Key Features

• Modular Design: Tap-off units are designed for plug-and-play installation, allowing quick connection to the busbar without extensive rewiring .
• Current Ratings: For small busbars, tap-off units typically handle currents from 16 A up to 160 A, depending on the system and application .
• Safety: Units provide all-round contact hazard protection, short-circuit resistance, and mechanical/electrical interlocks to prevent accidental disconnection or overload .
• Monitoring: Some units include integrated energy measurement and power quality monitoring, enabling real-time tracking of consumption and early detection of overloads or unbalances .
• Compatibility: Available for copper or aluminum busbars, with various pole configurations (3-pole, 4-pole) and bar center distances (e.g., 40 mm, 60 mm) to suit different busbar sizes .

Applications

• Industrial Control Panels: Distributing power to machinery or production lines.
• Data Centers: Supplying server racks with flexible reconfiguration options.
• Commercial Buildings: Powering lighting, HVAC, or small equipment circuits.
• Energy Monitoring: Integration with energy management systems for efficiency and predictive maintenance .

Installation Considerations

• Tool-Free Mounting: Many small busbar tap-off units allow tool-free or plug-and-lock installation, reducing downtime .
• Positioning: Units can be installed along the busbar run, at riser starts, or at branching points to minimize space usage and maintain flexibility .
• Standards Compliance: Ensure units comply with IEC 61439 and other relevant safety standards for electrical distribution .

Examples of Products

• RiLine Busbar Systems: Modular, 3- or 4-pole, short-circuit resistant, with tool-free connections .
• Vertiv PowerBar MPB Tap-Off Units: Flexible installation, mechanical/electrical interlocks, and angled configurations for space optimization .
• Schneider Electric Canalis KNA/KNT: Prefabricated tap-off units for currents up to 160 A, suitable for data centers and commercial applications .
• Janitza AKM Tap-Off Units: Compact design with integrated energy monitoring and EMC compliance . Branching units for small busbars provide a safe, flexible, and modular solution for distributing power efficiently while enabling monitoring and future expansion. Proper selection depends on current rating, busbar type, installation space, and monitoring requirements.