ABB - Installation Products MD550 - T&B Method Traction Motor Disconnect Lug for Diesel-Electric Locomotives, Cable Size 550/24, Bolt Hole 5/16 Inch on 7/8 Inch Centers, Die Code 76
ABB - Installation Products

MD550

UPC: 786210864402

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Overview

The ABB - Installation Products MD550 T&B Method Traction Motor Disconnect Lug (SKU: MD550) is a high-amperage copper disconnect designed for diesel-electric locomotive traction motor applications. Engineered for rapid off-load connections while maintaining system integrity, this lug leverages a multicontact design to deliver low insertion/extraction forces, minimal resistance, and reduced temperature rise during operation. Its construction prioritizes electrical conductivity and mechanical durability under heavy railway duty cycles. Key features include a 99.9% conductive copper body with silver plating for superior corrosion resistance and conductivity. The louvered band of beryllium copper provides 8,000–10,000 psi contact pressure at each of its deflected edges, creating multiple high-force contact points. This design ensures consistent performance even under short-circuit conditions, where increased current further enhances contact efficiency. The MD550 accommodates a 550/24 cable size and features a 5/16-inch bolt hole spaced on 7/8-inch centers for secure mounting. Die Code 76 ensures compatibility with established industrial crimping standards, guaranteeing a high-quality, repeatable connection. Built for heavy-duty railway operations, the MD550 enables multiple disconnections and reconnections without degradation in performance, making it ideal for maintenance, troubleshooting, or traction motor servicing. Its robust construction withstands the operational stresses of locomotive service, including thermal cycling and mechanical vibration. Trust ABB - Installation Products for reliable electrical solutions that meet the stringent demands of railway electrification systems.
  • 99.9% conductive copper with silver plating for corrosion resistance and conductivity
  • Louvered beryllium copper contact band provides 8,000–10,000 psi contact pressure
  • Accommodates 550/24 cable size with 5/16" bolt hole on 7/8" centers
  • Die Code 76 ensures compatibility with industrial crimping standards
  • Designed for rapid off-load connections with low insertion/extraction forces

Specifications

Finish
Tin Plated
Material
Copper
Material
Copper, Tin Plated
Mounting Type
Mounting on 7/8 Inch Centers
Mounting Type
Bolt Hole on 7/8 Inch Centers
Series
T&B Method Traction Motor Disconnect Lug
Size
Cable Size 550/24, Bolt Hole 5/16 Inch on 7/8 Inch Centers
Size
550/24
Type
Motor Disconnect Lug
Voltage Rating
600 V
Package Dimensions (L x W x H)
0.01 IN x 0.01 IN x 0.01 IN
Package Dimensions (L x W x H)
0.0254 cm x 0.0254 cm x 0.0254 cm
Package Weight (Imperial)
0.001 L
Package Weight (Metric)
0.001 kg
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How to Install the MD550 Motor-Disconnect Lugs

This guide provides step-by-step instructions for installing and crimping the MD550 motor-disconnect lugs for secure electrical connections.

Estimated time: 30m

Tools needed:

Wire strippers, Crimping tool, Multimeter

Supplies needed:

Copper cable, Terminal connectors, Wire brush

  1. Strip the cable insulation

    Strip the insulation from the copper cable to the length specified in the installation table. Avoid nicking the cable strands to prevent breakage.

  2. Prepare the cable end

    Clean the cable end with a wire brush and insert it into the terminal connector until it stops. Inspect through the peep hole to ensure the cable is fully inserted.

  3. Crimp the connector

    Insert the terminal connector into the appropriate crimping die and compress it in the center of the barrel recess. Ensure you are using the correct die code to avoid defective connections.

  4. Remove sharp edges

    After crimping, carefully remove any sharp edges, flash, or burrs from the connector to ensure safe handling.

  5. Verify connections

    Use a multimeter to verify that all connections are secure and functioning properly before energizing the system.

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