Bus trunking connector specifications

Bus trunking connectors are designed to safely join busbar trunking sections, supporting rated currents from 25 A up to 6300 A, with IP protection from IP55 to IP68, and comply with IEC 61439-6 standards.

Electrical Ratings

Bus trunking connectors are rated according to the system they serve:

• Low to medium currents: 25–160 A for small workshop or building loads (BD01 system)
• Medium currents: 160–1250 A for industrial or medium-size building loads (BD2 system)
• High currents: 800–6300 A for large infrastructure or industrial applications (LI and LD systems)
• Rated operating voltage typically aligns with the busbar system, often up to 690 V AC for low-voltage applications .

Mechanical and Construction Features

• Connectors are designed for plug-in or feeder connections, allowing safe and rapid assembly .
• Standard busbar trunking systems use 4 conductors (L1, L2, L3, N+PE), with optional 5-conductor versions including a separate neutral .
• Conductors are PVC insulated or encapsulated in resin for high protection (IP68) in extreme environments .
• The outer casing is typically galvanized sheet metal or optionally painted (RAL7038), providing mechanical durability .
• Special lengths are available in 1 m, 1.5 m, and 2 m, with end covers and tap-off boxes designed for safe installation .

Environmental and Protection Ratings

• IP55 to IP68 protection depending on system type:
  • IP55–IP66 for standard industrial and infrastructure applications (LI system)
  • IP68 for extreme ambient conditions, including saline or wet environments (LR encapsulated system), .
• Suitable for indoor and outdoor installations, including hybrid systems with varying degrees of protection .

Standards Compliance

• All bus trunking connectors comply with IEC 61439-6, which specifies requirements for busbar trunking systems and their components .
• Systems are tested for short-circuit withstand, thermal limits, and mechanical durability to ensure safe operation under rated conditions .

Installation and Planning

• Connectors are designed for modular assembly, allowing sections to be joined with plug-in or screw-type systems .
• Recommended installation distances and support structures must be followed to maintain mechanical stability and electrical safety .
• Digital planning tools like SIMARIS BusbarPlan and BusbarCheck app assist in configuration, installation, and energy management integration . Bus trunking connectors are therefore highly versatile, supporting a wide range of currents, environmental conditions, and installation scenarios, while ensuring compliance with international safety standards.