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Bus Plug

Bus plugs are used to tap power from compatible LS Busway systems and distribute it to downstream equipment where power is needed. They support flexible load placement, easier expansion, and more organized power distribution across commercial, industrial, and data center environments.

By allowing power to be accessed along the busway run, bus plugs help project teams adapt to equipment changes without redesigning the entire distribution path. Available configurations depend on the busway system, current rating, protection requirements, and project application.

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600 V
Rated Voltage AC
250 – 800 A
Current Range
Al / Cu
Al ≤ 600A · Cu ≤ 800A
UL 857
Listed & IEC 61439
Hot-Swap
Tap-Off Boxes
OH / UF
Overhead or Underfloor

UL-Listed Bus Plugs for LS Busway Systems

LS Busway offers high-quality bus plugs available in fusible and non-fusible configurations. A bus plug is a device that connects to a busway power distribution system to provide a localized connection point for feeding equipment, machinery, or downstream panels. Bus plugs typically include branch-circuit protection, most commonly provided by either a circuit breaker or fuses, depending on the application and protection preference. LS Busway offers bus plugs in two configurations: an MCCB (Molded Case Circuit Breaker) bus plug and a fusible disconnect bus plug. Each LS bus plug ensures safe, modular power distribution with UL certification and easy installation. 

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MCCB Bus Plug

The MCCB (Molded Case Circuit Breaker) Bus plug is a vital component designed for use with LS Busway systems, providing a reliable and efficient solution for branch circuit protection and power distribution. Built to handle diverse power demands, the MCCB Busplug is an ideal choice for both industrial and commercial applications requiring safety, flexibility, and ease of operation.

LS Busplug

Fusible Disconnect Bus Plug

The Fusible Disconnect Bus Plug is a robust and reliable device designed for use with LS Busway systems, offering secure power isolation and protection for branch circuits. Engineered for high performance in demanding environments, this bus plug is ideal for facilities that require safe and efficient power distribution with enhanced fault protection.

Key Bus Plug Features

Built for safe, flexible and efficient branch power distribution across LS Busway systems.
Circuit Protection
Choose MCCB or fusible disconnect busplug designs for overload, short-circuit and fault protection based on application needs.
Compact, Durable Design
Space-saving construction and corrosion-resistant materials help deliver long-term performance in demanding environments.
Safe, User-Friendly Operation
UL-listed construction, clear labeling and accessible operating components help support safe installation, maintenance and troubleshooting.
Flexible Installation
Designed for easy integration with LS Busway systems, helping support adaptable power distribution layouts in commercial and industrial spaces. 
Specifications
Full Technical Specifications
Reference values per UL 857. For job-specific values, see test reports linked in the Downloads section.
Electrical
Rated Voltage AC ≤ 600 V (1000 V option per flyer)
Rated Current Continuous 250 / 315 / 400 / 500 / 630 / 800 A
Rated Frequency - 50 / 60 Hz
Short-Circuit Withstand Icw, 1 s up to 150 kA RMS sym.
Peak Withstand Ipk up to 330 kA
Insulation Class - B (130 °C) std · F (155 °C) opt.
Dielectric Strength 1 min 2.5 kV (LV) / 3.5 kV (1000 V opt.)
Mechanical
Housing Material Extruded aluminum alloy 6063-T5
Conductor Material Cu 99.95 % ETP · Al 1350-H19
Cross-section (W × H) 3-ph 4-w Varies — see Configurations table below
Standard Length - 3 m / 10 ft (1 m – 3 m available)
Weight kg / m 8 – 42 kg/m (current dependent)
Bending Radius min 300 mm (12 in)
Environmental
Operating Temperature Ambient -5 °C to +40 °C (derate above 40 °C)
Storage Temperature - -25 °C to +70 °C
Relative Humidity non-cond. ≤ 95 %
Ingress Protection - IP54 (NEMA 1) · IP65 (NEMA 3R) opt.
Altitude - ≤ 2000 m (derate above)
Seismic IEEE 693 Qualified — High level
Compliance & Standards
UL - UL 857 Listed (file E######)
NEC - Article 368 compliant
IEC - IEC 61439-6 type-tested
NEMA - NEMA BU 1.1
RoHS / REACH - Compliant
Configurations
Available Variants & Part Numbers
Use this matrix to identify the exact SKU for your specification. Filter by current rating, conductor, and housing.
Name Current Conductor W × H (mm) Weight (kg/m) Housing Datasheet URL
Bus-0630-CU-N1 630 Cu 180 × 110 9.2 NEMA 1 PDF
Bus-1000-CU-N1 1000 Cu 190 × 120 13.0 NEMA 1 PDF
Bus-1600-CU-N1 1600 Cu 210 × 145 18.5 NEMA 1 PDF
Bus-2500-AL-N1 2500 Al 240 × 175 22.0 NEMA 1 PDF
Bus-4000-CU-N3R 4000 Cu 290 × 220 34.0 NEMA 3R PDF
Bus-6000-CU-N3R 6000 Cu 340 × 260 42.0 NEMA 3R PDF
Bus-0630-CU-N1 630 Cu 180 × 110 9.2 NEMA 1 PDF
Bus-0630-CU-N1 630 Cu 180 × 110 9.2 NEMA 1 PDF
Bus-0630-CU-N1 630 Cu 180 × 110 9.2 NEMA 1 PDF
Bus-0630-CU-N1 630 Cu 180 × 110 9.2 NEMA 1 PDF
Bus-0630-CU-N1 630 Cu 180 × 110 9.2 NEMA 1 PDF
Bus-0630-CU-N1 630 Cu 180 × 110 9.2 NEMA 1 PDF
Bus-0630-CU-N1 630 Cu 180 × 110 9.2 NEMA 1 PDF

Certifications & Compliance

All Busway products are designed, manufactured, and tested to international and domestic standards. 
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Product Resources

  • Full Technical Specifications
  • Available Variants
  • Certifications & Compliance
  • Engineering Documents
Full Technical Specifications
Product documentation is available upon request. Contact LS Busway for the latest product literature, technical data, and project-specific documentation. 
Request Documentation
Available Variants
Product documentation is available upon request. Contact LS Busway for the latest product literature, technical data, and project-specific documentation. 
Request Full Variant List
Certifications & Compliance
Certification and compliance documentation may vary by product, configuration, and project requirements. Please contact LS Busway to request the applicable documentation for your project.
Request Certifications
Engineering Documents
Product documentation is available upon request. Contact LS Busway for the latest product literature, technical data, and project-specific documentation.
Request Documentation
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https://21727518.fs1.hubspotusercontent-na1.net/hubfs/21727518/LSBus_MAY_2026/Data_center_icon.png Data Centers

High Power Density: Busway is designed to handle large power loads efficiently, making them suitable for high-density computing environments where numerous servers require significant power.

Improved Airflow: Since they eliminate the need for numerous power cables, busway create open spaces which enhance airflow around server racks, optimizing cooling efficiency.

Space Saving: Their compact design allows for more efficient use of data center floor space.

Downloads

Engineering Documents

PDF
Bus Plugs Datasheet

Rev. 2 · Dec 2025 · 1.2 MB

Download

Technical FAQ

View All
What is a bus plug?
A bus plug is a device used to tap power from a compatible busway system and distribute it to downstream equipment, machinery, panels, or other electrical loads. 
How do I know which bus plug I need?
The correct bus plug depends on the busway system, current rating, protection requirements, equipment load, installation location, and project standards. Contact LS Busway for help reviewing the correct configuration. 
What types of bus plugs are available?
Bus plugs are available in different configurations, including circuit breaker and fusible disconnect options. Final availability depends on the compatible busway system, current rating, and project requirements. 
Can bus plugs be added or moved after installation?
Bus plug installation or relocation depends on the system design, site conditions, and applicable safety procedures. Any work should be performed by qualified personnel and follow approved product instructions and electrical safety requirements. 
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Need Help Specifying?

Our application engineers can help you select the right busway system, provide layout
assistance, and generate a project-specific quotation.

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