Busbar tray specifications

Busbar trays are modular electrical distribution systems designed for safe, efficient power transfer, with specifications including spacing, current capacity, mounting, and short-circuit strength.

Key Specifications

Busbar Spacing and Dimensions: Standard busbar spacing is typically 60 mm, though 40 mm, 100 mm, and 185 mm systems are also used depending on application requirements . The spacing affects the short-circuit strength and the ability to mount protective devices directly on the busbar. Current Carrying Capacity: The permissible busbar temperature is critical for dimensioning and depends on the current, busbar cross-section, surface area, and ambient conditions. Continuous current ratings are provided as guide values, and symmetrical load distribution is recommended for optimal performance . Mounting Systems: Busbars are mounted horizontally using supports such as top hat rails or adapter modules. The short-circuit strength of the system depends on the distance between supports and the busbar cross-section. Finger-safe covers and mechanical fixing in a single step enhance operational safety . Short-Circuit Strength: The system's short-circuit strength is determined by both the busbars and the adapters with circuit breakers or switch disconnectors. If the prospective short-circuit current exceeds the system rating, upstream protective devices must be installed . Material and Profiles: Common busbar materials include flat copper profiles, which are widely used in 8US busbar systems. Plastic parts must be secured to prevent vibration, and cutting of cover profiles requires specific tools and parameters for safety .

Models and Product Lines

Siemens SIVACON 8PS Busbar Trunking Systems: These systems offer plug-and-work installation, digital twin integration via SIMARIS software, and energy data transfer to automation or cloud-based systems. Variants include BD2, LD, LData, and LI busbar trunking systems, suitable for industrial and special-purpose buildings . EAE Electric Busbar and Cable Trays: EAE provides a wide range of busbar trays, trolley busbars, and cable trays with downloadable catalogues for detailed specifications and model selection . IEC-Compliant Mounting Systems: IEC busbar mounting systems provide modularity with adapter extensions, top hat rails, and crossboard universal adapters. Load capacity depends on system topography, ambient temperature, and busbar load distribution .

Planning and Installation Tools

• SIMARIS Design and Toolbox: Software tools for grid calculation, dimensioning, and planning of busbar systems. Supports BIM data integration and project-specific IFC files for cross-package planning .
• BusbarCheck App: Assists during installation to ensure correct assembly and compliance with specifications .

Summary

Busbar trays are designed for efficient, safe, and modular power distribution. Key considerations include spacing, current capacity, mounting, short-circuit strength, and material. Leading models include Siemens SIVACON 8PS, EAE Electric busbar trays, and IEC-compliant systems, with planning supported by SIMARIS software and digital tools for installation and energy management .