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CR-Way MV

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Part series: EX-W-xxxx . Issued: Rev. 7, 2026 . Country of origin: USA (Tarboro, NC)
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CR MV_20p_1
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

Reliable Power Distribution in the Harshest Conditions

The LS Busway CR MV system (also known as CR-way) is an advanced medium-voltage power distribution solution designed for superior reliability and safety where only the highest level of stability is required. Waterproof, fireproof and explosion- proof, the ultra-robust CR MV ensures efficient power delivery in even the toughest industrial and commercial environments.

CR MV_20p_1

Reliable Medium-Voltage Operation

  • Supports voltage levels from 3.6kV to 36kV, suitable for critical power applications.
  • Engineered to handle high fault currents with excellent short-circuit withstand strength.

Compact and Modular Design

  • Space-saving configuration enables efficient power distribution in areas with limited space.
  • Modular setup allows for scalable installations, adapting to growing power demands.

High Safety Standards

  • Compliant with global standards such as IEC 62271 and ANSI/IEEE C37.
  • Features a non-flammable epoxy cast-resin insulation, minimizing fire risk.
  • Superior protection against partial discharge ensures long-lasting reliability.

Durable and Versatile

  • Built to withstand harsh environmental conditions, including high temperatures, humidity, and seismic activity.
  • Corrosion-resistant construction enhances operational longevity.

Energy Efficiency

  • Low power loss due to advanced conductor and insulation materials.
  • Reduces total energy consumption, making it a sustainable choice for power distribution.

Ease of Installation and Maintenance

  • Plug-and-play components ensure fast and simple installation.
  • Maintenance-friendly design minimizes downtime and operational disruptions.

Configuration

Capacity Range

  • Supports 250A up to 800A, suitable for low-voltage applications Voltage Ratings
  • Standard configurations support up to 600V for low-voltage systems under UL857 standard.

Conductor Options

  • Choose between aluminum up to 600A, or copper up to 800A conductors for specific efficiency and budget needs

Tap-Off Boxes

  • Available in plug-in options for power distribution to equipment.
  • Hot-swappable tap-off boxes for maintenance without downtime.

Jointing System

  • Double-headed bolts ensure secure, reliable connections.
  • Easy-to-assemble joint kits for fast and accurate installations.

Environmental Tolerance

  • Designed for indoor installations.
  • Resistant to seismic and environmental stress for consistent performance.

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
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
CR-W-0630-CU-N1 630 Cu 180 × 110 9.2 NEMA 1 PDF
CR-W-1000-CU-N1 1000 Cu 190 × 120 13.0 NEMA 1 PDF
CR-W-1600-CU-N1 1600 Cu 210 × 145 18.5 NEMA 1 PDF
CR-W-2500-AL-N1 2500 Al 240 × 175 22.0 NEMA 1 PDF
CR-W-4000-CU-N3R 4000 Cu 290 × 220 34.0 NEMA 3R PDF
CR-W-6000-CU-N3R 6000 Cu 340 × 260 42.0 NEMA 3R PDF
CR-W-0630-CU-N1 630 Cu 180 × 110 9.2 NEMA 1 PDF
CR-W-0630-CU-N1 630 Cu 180 × 110 9.2 NEMA 1 PDF
CR-W-0630-CU-N1 630 Cu 180 × 110 9.2 NEMA 1 PDF
CR-W-0630-CU-N1 630 Cu 180 × 110 9.2 NEMA 1 PDF
CR-W-0630-CU-N1 630 Cu 180 × 110 9.2 NEMA 1 PDF
CR-W-0630-CU-N1 630 Cu 180 × 110 9.2 NEMA 1 PDF
CR-W-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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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
CR-Way MV Datasheet

Rev. 3 · Feb 2026 · 2.6 MB

Download

Technical FAQ

View All
What is CR-Way MV used for?
CR-Way MV is used for medium-voltage power distribution in demanding environments where durability, insulation performance, and long-term reliability are important. 
What makes CR-Way MV different from other medium-voltage busway options?
CR-Way MV uses a cast-resin-insulated design that helps protect the busway system in demanding environments. The best product choice depends on project conditions, voltage, current rating, environmental exposure, and installation requirements.
What type of applications is CR-Way MV designed for?
 CR-Way MV can support industrial facilities, power plants, infrastructure projects, tunnels, offshore or coastal environments, and other applications where medium-voltage power distribution must withstand harsh conditions.
How do I confirm the correct CR-Way MV configuration?
Contact LS Busway with project details such as voltage, current rating, layout, installation location, environmental conditions, and required documentation so the team can help review the appropriate configuration.
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