WISETREE is a professional bimetallic connectors manufacturer and supplier in China, providing copper aluminum connectors for electrical power distribution, cable jointing, and industrial electrical installations. As part of our cable connectors manufacturer product range, we supply Cu-Al connectors, bimetallic compression connectors, reducing connectors, pin connectors, and transition connection products for compatible copper and aluminum electrical conductors.
Our bimetallic connector range includes CAU, BCRL, DSL, PBL-A, PBL-B, and GTL series. These copper aluminum connectors are selected according to conductor material, cable cross-section, connection structure, and installation requirements. WISETREE supplies standard product models and supports custom bimetallic connector inquiries based on technical drawings and project specifications.
Whether you need aluminum-to-copper cable connectors for power distribution projects, equipment connections, or wholesale purchasing, WISETREE can assist with product selection, dimensional specifications, samples, and bulk order quotations.
Bimetallic Connector Product Range
WISETREE offers six bimetallic connector series covering different copper-aluminum transition requirements. Compare the connection types below to select suitable Cu-Al connector products.
| Product Series |
Connection Type |
Selection Focus |
| CAU Bimetallic Connector |
Cu-Al connector series |
Connector geometry, conductor or terminal interface, material compatibility and installation requirements. |
| BCRL Bimetallic Connector |
Bi-metal crimp and reducing connector |
Different conductor cross-sections, reducing structure and compression requirements. |
| GTL Bimetallic Connector |
Copper-aluminum transition connector |
Two-sided conductor dimensions, connector length and transition design. |
| PBL-A Bimetallic Connector |
Pin-type Cu-Al connector |
Pin dimensions, conductor entry and equipment terminal compatibility. |
| PBL-B Bimetallic Connector |
Pin-type Cu-Al connector |
Pin structure, dimensional differences and connection interface. |
| DSL Bimetallic Connector |
Stalk-type bimetallic connector |
Stalk dimensions, connection geometry and equipment terminal requirements. |
For cable-to-cable transition joints, review the GTL series and suitable BCRL reducing connectors. For pin-type or stalk-type electrical connections, compare PBL-A, PBL-B, and DSL according to the equipment terminal dimensions. The CAU series should be selected using its product-specific connection drawing.
Bimetallic Connector Specifications & Available Sizes
Bimetallic cable connectors must match both sides of the electrical connection. For copper-aluminum transition joints, confirm the aluminum-side and copper-side conductor specifications separately.
| Specification |
Selection Information |
| Product Series |
CAU / BCRL / DSL / PBL-A / PBL-B / GTL |
| Aluminum Conductor Size |
Required cross-section in mm² or equivalent cable designation. |
| Copper Conductor Size |
Required copper conductor cross-section or terminal interface dimensions. |
| Conductor Construction |
Solid, stranded, compacted or flexible, where supported by the model. |
| Connector Length |
Overall length L (mm). |
| Connector Diameters |
Model-specific D1, d1, D2 and d2 dimensions. |
| Pin / Stalk Dimensions |
Pin diameter, length and connection interface dimensions. |
| Material |
Specified copper and aluminum material grades. |
| Bonding Structure |
Model-specific copper-aluminum transition design. |
| Installation Method |
Specified compression or equipment terminal connection method. |
| Applicable Standard |
Model-specific standard and project requirements. |
GTL Bimetallic Connector Dimensions
The WISETREE GTL bimetallic connector series includes transition models with different dimensions at each end. Selected published dimensions are listed below.
| GTL Model |
L (mm) |
D1 (mm) |
d1 (mm) |
D2 (mm) |
d2 (mm) |
| GTL 16/10 |
70 |
10 |
6.5 |
9 |
5.7 |
| GTL 25/16 |
75 |
12 |
7.5 |
10 |
6.5 |
| GTL 70/50 |
98 |
18 |
11.5 |
14 |
10 |
| GTL 95/70 |
106 |
21 |
13.5 |
16 |
11.5 |
| GTL 150/120 |
115 |
25 |
16.5 |
20 |
15 |
| GTL 240/185 |
130 |
30 |
21 |
24 |
18.5 |
| GTL 400/300 |
150 |
38 |
26.5 |
30 |
23.5 |
Note: Dimensions follow WISETREE's published GTL product table. Confirm the aluminum-side and copper-side dimension assignments using the corresponding technical drawing. Other dimensions can be evaluated for customization.
PBL-A Bimetallic Pin Connector Dimensions
The PBL-A series includes pin-type bimetallic connectors for suitable electrical terminal interfaces. Selected catalogue dimensions are shown below.
| Model |
L (mm) |
D (mm) |
D1 (mm) |
d1 (mm) |
d (mm) |
| PBL-16A |
56 |
12.0 |
5.8 |
9.5 |
6.0 |
| PBL-35A |
70 |
14.0 |
8.0 |
11.0 |
7.0 |
| PBL-70A |
87 |
18.0 |
11.0 |
14.5 |
9.0 |
| PBL-95A |
91 |
21.0 |
12.5 |
14.5 |
12.0 |
| PBL-150A |
108 |
25.0 |
16.5 |
15.5 |
12.0 |
| PBL-240A |
113 |
32.0 |
21.0 |
19.5 |
14.0 |
For PBL-A and PBL-B pin connectors, verify pin dimensions and equipment terminal compatibility before ordering. Other sizes can be reviewed according to customer drawings and manufacturing requirements.
How to Select Cu-Al Transition and Reducing Connectors
Select bimetallic cable connectors according to the required copper-aluminum connection, conductor sizes and installation structure.
| Connection Requirement |
Product Series to Review |
Key Selection Factors |
| Aluminum cable to copper cable |
GTL / suitable transition connector |
Al conductor size, Cu conductor size and transition dimensions. |
| Different conductor cross-sections |
BCRL |
Both conductor sizes, reducing geometry and compression compatibility. |
| Aluminum conductor to pin-type terminal |
PBL-A / PBL-B |
Conductor size, pin diameter, pin length and terminal acceptance dimensions. |
| Conductor to stalk-type terminal |
DSL |
Stalk geometry, equipment terminal interface and conductor dimensions. |
| Other specified Cu-Al connection |
CAU / model-specific connector |
Connection drawing, materials, dimensions and installation method. |
For copper aluminum cable connectors, do not select a product using only one cable size. Always verify both connection interfaces and the conductor construction.
For copper-to-copper joints, see copper cable connectors. For aluminum-to-aluminum connections, explore aluminum cable connectors.
Copper-Aluminum Bonding Methods & Connector Construction
The copper-aluminum interface is an important feature of bimetallic compression connectors. The bonding process, transition geometry and contact protection must match the product specification.
| Construction Feature |
Technical Requirement |
| Copper-Aluminum Interface |
Confirm the transition structure and joining method for the selected connector series. |
| Bonding Method |
Verify whether the specified model uses friction welding or another approved bonding process. |
| Transition Geometry |
Check both connection ends and the transition section against the drawing. |
| Center Barrier / Oil Stop |
Confirm the presence and function of a barrier or blocking structure where required. |
| Reducing Structure |
Verify the conductor-size pairing and internal connection dimensions. |
| Pin / Stalk Construction |
Match pin or stalk dimensions to the equipment terminal interface. |
| Bonding Quality |
Request applicable inspection or test documentation for the specified product. |
For projects requiring friction-welded bimetallic connectors, specify the bonding method in the RFQ. The available manufacturing process and technical evidence should be confirmed for each model.
Copper-Aluminum Materials & Corrosion Protection
Cu-Al connectors help provide a designed transition between compatible copper and aluminum connection points. Material selection and contact protection are important because direct contact between dissimilar metals can contribute to galvanic corrosion under certain conditions.
| Material / Protection Item |
Selection Considerations |
| Copper Material |
Specify the copper grade and required material properties. |
| Aluminum Material |
Confirm aluminum grade, conductor compatibility and material requirements. |
| Cu-Al Transition Interface |
Review bonding structure and application compatibility. |
| Oxidation Protection |
Follow the approved aluminum conductor preparation and connection procedure. |
| Jointing Compound |
Confirm whether contact compound is provided for the specified model. |
| Surface Finish |
Verify the required finish and available product configuration. |
| Environmental Conditions |
Consider moisture, corrosion exposure and the protection provided by the complete installation. |
Contact compound, surface treatment and bonding method are model-specific requirements. Customers should identify any special corrosion-protection specification before ordering bimetallic cable connectors.
Bimetallic Connector Crimping & Installation Requirements
For compression-type Cu-Al cable joints, installation requirements may differ between the aluminum and copper connection ends. Use the crimping system specified for the actual connector design.
| Installation Item |
Aluminum Side |
Copper Side |
| Conductor Material |
Confirm aluminum material and conductor construction. |
Confirm copper material and conductor construction. |
| Conductor Size |
Check the approved aluminum conductor range. |
Check the approved copper conductor range. |
| Conductor Preparation |
Follow specified stripping and oxide-management instructions. |
Follow specified stripping and conductor preparation instructions. |
| Insertion Depth |
Use the approved conductor insertion dimension. |
Use the approved conductor insertion dimension. |
| Crimping Tool |
Use the compatible tool and die for the aluminum side. |
Use the compatible tool and die for the copper side. |
| Crimping Sequence |
Follow model-specific position and compression instructions. |
Follow model-specific position and compression instructions. |
| Inspection |
Check the completed connection against the installation requirements. |
Check the completed connection against the installation requirements. |
For PBL-A, PBL-B and DSL connectors, also verify the equipment terminal dimensions and the applicable terminal fastening requirements. Pin and stalk connectors should not be installed using assumptions intended for straight-through cable splice connectors.
Bimetallic Connector Applications
WISETREE bimetallic cable connectors can be evaluated for copper-aluminum transition requirements in power distribution and industrial electrical systems.
| Application |
Connection Requirement |
Selection Focus |
| Power Distribution Cable Jointing |
Transition between compatible aluminum and copper conductors. |
Conductor dimensions and connector structure. |
| Transformer Connections |
Conductor connection to suitable equipment terminals. |
Pin, stalk or other specified terminal geometry. |
| Switchgear Connections |
Transition connections within compatible electrical equipment. |
Equipment interface, conductor size and installation space. |
| Substation Installations |
Cu-Al connections according to project specifications. |
Electrical requirements, applicable standards and documentation. |
| Industrial Electrical Systems |
Conductor transition or equipment connection. |
Connector dimensions and installation compatibility. |
| Cable Repair and Extension |
Connection between cables of different materials or sizes. |
Conductor compatibility and complete joint design. |
For aluminum cable termination to flat equipment palms or bolted terminals, see our bimetallic cable lugs. For bolted conductor joints, explore mechanical cable connectors.
Custom Bimetallic Connectors & OEM Manufacturing
WISETREE supports standard bimetallic connector orders and custom Cu-Al connector inquiries based on product drawings, conductor specifications and application requirements. Non-standard dimensions can be evaluated according to manufacturing feasibility.
| Customization Item |
Availability / Scope |
Required Information |
| Catalogue Series |
Standard: CAU, BCRL, DSL, PBL-A, PBL-B and GTL series. |
Model and quantity. |
| Aluminum Conductor Size |
Custom: Special conductor dimensions subject to evaluation. |
Al conductor size and construction. |
| Copper Conductor Size |
Custom: Special copper-side dimensions subject to evaluation. |
Cu conductor size or terminal dimensions. |
| Connector Length |
Custom: Non-standard overall length or connection length. |
Drawing and tolerances. |
| Connector Diameters |
Custom: Special inner and outer diameters. |
Dimensional drawing. |
| Material Grade |
Optional / Custom: Specified copper or aluminum grades subject to review. |
Material specifications. |
| Transition Structure |
Custom: Special connection geometry or size combination. |
Product drawing and application requirements. |
| Pin / Stalk Dimensions |
Custom: Special equipment connection dimensions. |
Terminal interface drawing. |
| Surface / Contact Protection |
Optional: Specified finish or compound requirements subject to confirmation. |
Technical requirements. |
| Marking & Packaging |
Optional: Customer identification, labels and packaging. |
Artwork and order quantity. |
Standard refers to existing catalogue product series. Optional and Custom items require confirmation of technical feasibility, material availability and purchasing conditions.
For OEM bimetallic connectors, submit your drawing, aluminum and copper conductor specifications, required dimensions, applicable standard and estimated annual or batch quantity.
Quality Control & Applicable Standards
WISETREE inspects products before shipment. For bimetallic compression connectors, additional project requirements should be checked against the selected model and available supporting documentation.
| Inspection / Technical Item |
Verification Focus |
| Material Verification |
Copper and aluminum material specifications. |
| Dimensional Inspection |
Connector length, bore dimensions, transition geometry and tolerances. |
| Bonding Interface |
Model-specific copper-aluminum bonding requirements. |
| Surface Inspection |
Visible defects, burrs and specified surface condition. |
| Electrical Performance |
Applicable electrical resistance or temperature-rise testing requirements. |
| Mechanical Performance |
Specified connection integrity or mechanical test requirements. |
| Product Identification |
Model, dimensions, markings and order traceability. |
Standards: Depending on product design and application, projects may specify relevant parts of the IEC 61238 series or other applicable standards. Compliance must be confirmed for the individual bimetallic connector model, applicable standard edition and test scope.
Customers requiring material certificates, electrical test reports or dimensional inspection records should identify these documents in the RFQ. Company-level quality management certification does not automatically establish product-level compliance.
MOQ, Samples, Lead Time & Packaging
WISETREE supplies bimetallic connectors for distributors, industrial electrical equipment manufacturers and project procurement. Purchasing conditions depend on product series, order quantity and customization requirements.
| Procurement Item |
Supply Information |
| Standard Models |
CAU, BCRL, DSL, PBL-A, PBL-B and GTL. |
| Standard MOQ |
Confirmed by product model and required quantity. |
| Custom MOQ |
Confirmed according to manufacturing requirements. |
| Standard Samples |
Samples may be provided without a sample charge, subject to availability and shipping arrangements. |
| Custom Samples |
Special customized samples may require a sample fee. |
| Sample Lead Time |
Confirmed according to model and sample requirements. |
| Bulk Production Lead Time |
Confirmed according to order quantity and production requirements. |
| Standard Packaging |
Product packaging and carton quantity confirmed for the selected model. |
| OEM Packaging |
Customer labels and packaging requirements can be evaluated. |
| Technical Documents |
Available drawings and product-specific information provided upon request. |
For bulk orders, provide the required bimetallic connector models, quantities, delivery destination and any special technical or packaging requirements.
Frequently Asked Questions About Bimetallic Connectors
What is the difference between GTL, BCRL, CAU, PBL and DSL bimetallic connectors?
GTL is a copper-aluminum transition connector series, while BCRL is intended for reducing connection requirements. PBL-A and PBL-B are pin-type products, and DSL is a stalk-type connector. CAU should be selected according to its model-specific connection drawing. Compare conductor dimensions, connection geometry and installation requirements before ordering.
How do I choose a bimetallic connector for copper and aluminum cables?
Specify the aluminum conductor size, copper conductor size, conductor construction and connection type. Then verify the connector dimensions and approved installation method. Both connection ends must be compatible with the selected model.
Can bimetallic reducing connectors join different conductor sizes?
Yes, reducing-type products such as BCRL are intended for specified unequal-size connection arrangements. The exact conductor size combination must match the approved connector specification. Provide both conductor sizes when requesting a model.
What is the difference between PBL-A and PBL-B bimetallic pin connectors?
PBL-A and PBL-B are separate pin-type connector series. Their suitability depends on the pin geometry, conductor connection dimensions and equipment terminal interface. Compare the corresponding product drawings rather than assuming the two series are interchangeable.
Are WISETREE copper aluminum connectors friction welded?
The bonding process should be confirmed for the selected model. If your project specifically requires friction-welded bimetallic connectors, include that requirement in your inquiry so the applicable design and supporting technical information can be reviewed.
Do bimetallic connectors require jointing compound?
Jointing compound requirements depend on the connector design, conductor material and approved installation procedure. Confirm whether the selected model is supplied with contact compound or requires separate contact preparation.
Which crimping tools are required for Cu-Al connectors?
Tool and die selection depends on the connector model and conductor sizes. Compression requirements may differ between the aluminum and copper connection ends. Use the installation system specified for the actual connector and conductor combination.
Can WISETREE manufacture custom bimetallic connectors?
Yes. WISETREE accepts custom bimetallic connector inquiries based on drawings and technical specifications. Customers can request evaluation of special dimensions, conductor size combinations, pin or stalk geometry and other application-specific requirements.
What are the MOQ and lead time for bimetallic cable connectors?
MOQ and lead time depend on the selected product series, quantity and customization requirements. Provide the required models and estimated order volume to obtain purchasing details and a quotation.
Request a Bimetallic Connector Quote
Looking for a bimetallic connectors manufacturer for copper-aluminum cable connections, reducing cable joints or equipment terminal applications? WISETREE supplies CAU, BCRL, DSL, PBL-A, PBL-B and GTL bimetallic connectors and supports custom Cu-Al connector inquiries.
Send us your product model, aluminum and copper conductor sizes, connection type, required dimensions, applicable technical specifications and order quantity. For custom bimetallic cable connectors, attach a technical drawing or reference sample to help us evaluate your requirements and prepare a quotation.
Need Custom or Standard Bimetallic Connectors?
Contact WISETREE for Cu-Al connector specifications, GTL and PBL model selection, custom dimensions, samples and bulk purchasing quotations. Share your conductor sizes or technical drawings to get started.
Request Bimetallic Connector Quote →
