Bimetallic Cable Lugs for Aluminum-to-Copper Connections

WISETREE supplies bimetallic cable lugs for terminating aluminum conductors onto compatible copper terminals, copper busbars and electrical equipment connection points. The current range includes DTL, DTL-2, BLF, CAU and other product series for different conductor sizes, mounting dimensions and project requirements.

A bimetallic cable lug should be selected according to the aluminum conductor, copper-side equipment interface, stud hole, palm dimensions, product series and installation requirements.

If your conductor and equipment connection are both aluminum-compatible, see our Aluminum Cable Lugs. For copper conductors, browse Copper Cable Lugs.

When Do You Need a Bimetallic Cable Lug?

The conductor material and equipment-side connection material should be confirmed before selecting a cable lug.

Bimetallic cable lugs are commonly selected where the cable conductor and equipment connection point use different metals.

Do not select a lug only according to conductor size. The material and dimensions on both sides of the connection should be checked together.

Bimetallic Cable Lug Series

WISETREE offers multiple bimetallic cable lug series, including:

• DTL

• DTL-2

• DTL-2-S

• DTL-F

• DTL-2-F

• BLF

• BLF DIN

• BLF-E

• CAU

• CAU-DIN

• BL

• BLT

• MCCB-related configurations

• Other project-specific series

These product names represent different dimensional or structural configurations within the current product range.

Do not select one series only according to its name. Compare the conductor range, mounting dimensions, equipment interface and project specification of the individual product before ordering.

Bimetallic Cable Lug Selection Guide

Use this table for initial selection. Confirm the final product against the specifications of the individual model.

Key Specifications for Bimetallic Cable Lug Selection

Use the following parameters when comparing products or preparing an RFQ.

If an existing product drawing is available, include it with the inquiry to simplify dimensional comparison.

Aluminum-to-Copper Transition Construction

The defining feature of a bimetallic cable lug is the transition between the aluminum conductor side and the copper equipment side.

When evaluating a bimetallic lug, confirm the actual construction of the selected series, including:

• Aluminum-side material

• Copper-side material

• Transition section

• Joining process

• Surface treatment

• Product dimensions

• Inspection requirements

The manufacturing method used at the aluminum-to-copper transition can vary by product series.

Do not assume that every bimetallic lug uses the same joining process.

If your project specifies a particular transition method or technical requirement, include it in the RFQ so the selected product can be checked accordingly.

Aluminum Conductor Preparation

The conductor side of a bimetallic lug is still an aluminum connection, so cable preparation and surface condition require attention.

Before installation, confirm the requirements for the selected product and cable system.

Depending on the product and project specification, this may include:

• Conductor surface preparation

• Removal of surface contamination

• Connection compound requirements

• Compression method

• Crimping tool and die compatibility

• Corrosion-protection requirements

If your project requires a particular preparation method, inhibitor compound or corrosion protection system, include that information before order confirmation.

DTL, BLF, CAU and Other Product Series

WISETREE's bimetallic cable lug range includes multiple product families for different dimensional and connection requirements.

DTL Series

For a DTL product, confirm the aluminum conductor size, barrel dimensions, copper-side stud hole and overall lug dimensions.

Different DTL variants may have different dimensions or connection structures, so refer to the individual product specification before selection.

BLF Series

BLF and related BLF-designated products are available within the current range.

Confirm the conductor range, mounting dimensions and any required dimensional designation against the specific BLF model.

CAU Series

CAU and CAU-DIN products should be selected according to conductor size, copper-side interface and the dimensional requirements of the project.

MCCB Connection Products

Where a bimetallic lug will connect to an MCCB, confirm the breaker terminal dimensions and available mounting space.

Do not assume that a general-purpose bimetallic lug will fit every MCCB terminal.

Other Series

BL, BLT and other bimetallic lug products should be matched according to their individual dimensions and specified application.

If the correct series is unclear, send the cable specification and equipment connection dimensions rather than selecting only by product name.

Standards and Project Requirements

Power distribution and electrical equipment projects may specify particular dimensional, mechanical or installation requirements for bimetallic cable lugs.

If your project refers to a DIN series, IEC requirement, utility specification, customer drawing or other technical standard, provide the exact reference when requesting a quotation.

Useful information includes:

• Required standard or dimensional series

• Cable specification

• Equipment terminal dimensions

• Technical drawing

• Required inspection items

• Documentation requirements

Compliance should be confirmed against the specific bimetallic lug series rather than assumed across the complete product range.

Compression Compatibility

For compression-type bimetallic cable lugs, reliable installation depends on compatibility between the aluminum conductor, lug barrel and crimping system.

Before installation, confirm:

• Cable size

• Conductor construction

• Lug series

• Crimping method

• Compatible tool

• Compatible die

If technical crimping information is required for a particular model, request it together with the product specification.

For projects requiring a bolted termination rather than a compression connection, see Mechanical Cable Lugs.

Custom Bimetallic Cable Lugs

Standard bimetallic lug dimensions do not fit every transformer, switchgear, busbar or electrical equipment interface.

Custom requirements may include:

• Aluminum conductor size or range

• Barrel inner diameter

• Barrel outer diameter

• Barrel length

• Copper palm width

• Palm thickness

• Stud hole diameter

• Overall length

• Connection configuration

• Surface requirement

• Product marking

• Packaging

For custom product evaluation, send:

• Aluminum cable specification

• Copper-side equipment dimensions

• Technical drawing or sample

• Application

• Estimated quantity

If no formal drawing is available, provide clear dimensions or an existing sample for initial review.

Typical Applications

Bimetallic cable lugs are used where aluminum power conductors terminate onto compatible copper connection points in applications such as:

• Switchgear

• Transformers

• Copper busbar systems

• MCCB connections

• Distribution panels

• Power distribution equipment

• Renewable energy systems

• Industrial power equipment

• Utility and infrastructure projects

For aluminum-to-aluminum-compatible terminations, see Aluminum Cable Lugs.

For conductor-to-conductor transition connections, browse Bimetallic Connectors.

For flexible copper connections and busbars used inside electrical equipment, visit Flexible Copper Braided Wires & Copper Busbar.

Sample and Project Procurement Support

Sample Evaluation

Samples can help confirm:

• Aluminum conductor fit

• Copper-side stud compatibility

• Equipment terminal dimensions

• Product series

• Replacement compatibility

• Custom dimensions

Standard catalogue samples may be available without a sample charge, while specially customized samples may involve additional cost depending on the requirement.

Project Orders

For projects using several aluminum cable sizes or different equipment interfaces, send the complete cable schedule and connection list.

This allows multiple bimetallic lug models to be reviewed together.

For more information about our company and product supply capabilities, visit About WISETREE.

Frequently Asked Questions

When should I use a bimetallic cable lug?

Use a suitable bimetallic cable lug where an aluminum conductor needs to terminate onto a compatible copper terminal, busbar or equipment connection point. Confirm the materials on both sides before selecting the product.

Can an aluminum cable connect directly to a copper busbar?

Do not select a standard aluminum lug for an aluminum-to-copper connection without checking material compatibility. A suitable bimetallic lug may be required where the aluminum conductor terminates onto a copper busbar.

How do I choose the correct DTL bimetallic lug size?

Start with the aluminum conductor size, then confirm the barrel dimensions, copper-side stud hole, palm dimensions and overall product dimensions. Different DTL variants may have different specifications.

What is the difference between DTL, BLF and CAU bimetallic lugs?

Their conductor ranges, dimensions and interface configurations can differ. Select the series according to the individual product specification rather than the series name alone.

How do I select the correct stud hole?

Confirm the stud or bolt diameter on the copper-side equipment connection. The lug mounting hole should match that interface.

Does conductor construction affect bimetallic lug selection?

Yes. Stranded, compacted, round and other aluminum conductor constructions may have different physical dimensions. Provide the conductor construction together with the nominal cable size.

What should I confirm before crimping an aluminum conductor?

Confirm the conductor size, conductor construction, lug series, preparation requirement, crimping method and compatible tooling. Follow the installation information applicable to the selected product.

Can bimetallic cable lug dimensions be customized?

Project-specific dimensions can be reviewed according to manufacturing feasibility. Send the aluminum cable specification, copper-side connection dimensions, drawing and estimated quantity for evaluation.

Send Your Aluminum-to-Copper Connection Specification

If you already know the required product series, send the model, conductor size, stud hole and quantity for quotation.

If you are still comparing DTL, BLF, CAU or other bimetallic lug options, provide your aluminum cable size, conductor construction, copper-side equipment type, stud size and required dimensions.

For non-standard connections, attach an equipment drawing, cable lug drawing or reference sample.

Contact WISETREE to request bimetallic cable lug specifications, samples or a quotation.