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SK-TC CU-AL Transition Harness
Lower cost. Safer CU-AL connections.
Home / Copper to Aluminum Connection SKTC
Built for Reliable CU-AL Connections
TÜV Certified System
Aluminum conductor PV cables comply with TÜV 2PfG 2642 (1500V) and 2954 (2000V) standards, supported by a TÜV-certified connector portfolio for proven safety and compliance.
Superior Corrosion Protection
Multi-layer plating structure combined with patented 3SETP coating technology delivers outstanding resistance in harsh environments.
Innovative CU-AL-CU Structure
Unique “copper–aluminum–copper” design combines the conductivity of copper with the cost advantages of aluminum, ensuring optimal performance and reduced material cost.
Ultra-Low Contact Resistance
≤ 0.3 mΩ contact resistance enables stable performance under high current loads.
Break-Resistant Design
Solid-state Cu-Al friction welding ensures zero thermal damage and superior mechanical integrity.
25-Year Long-Term Stability
Validated through rigorous multi-stage testing for proven durability and reliability over time.
Why Choose SUNKEAN
Advanced Manufacturing Capability
Strict Quality Control
Global Project Experience
Pre-Assembled CU-AL Harness for Fast Installation
Trusted by Solar Projects Globally
PV Las Violetas (Chile)
· 852 sets CU-AL connectors deployed
· 51 km aluminum cable installed
Reduced cable costs while ensuring stable long-term performance
PV Los Quilos (Chile)
· 1,481 sets CU-AL connectors deployed
· 112 km aluminum cable installed
Improved installation efficiency with reliable copper-aluminum connections
Chile Solar Farm
· 6,000 sets CU-AL connectors deployed
· 120 km aluminum cable installed
Enabled large-scale deployment with consistent connection quality
Why is aluminum used to replace copper?
FAQ on Copper to Aluminum Connection
How much cost savings can SUNKEAN’s copper-to-aluminum connection solution deliver?Compared to a full-copper system, this solution reduces costs by up to 58%. In a 1 GW PV power plant project, the savings can exceed USD 2,750,000.
How is SUNKEAN's copper-to-aluminum conversion harness designed to ensure stability and safety?The harness uses a "copper–aluminum–copper" structure: copper conductors on both ends with an aluminum conductor in the middle, plus a plastic connector housing. It supports high currents and allows quick on-site crimping at the aluminum end for simplified installation.
What welding process is used for the copper-to-aluminum joint, and how reliable is it?
The connection adopts friction welding (solid-state bonding), which operates at low temperatures to minimize thermal damage to the cable. Over 25 years, conductivity degradation is less than 0.5%. The tensile strength is verified through pull and impact testing.
How does the copper-to-aluminum connector maintain corrosion resistance in harsh environments?
The joint surface is protected by a three-layer gradient structure: diffusion layer, chemical nickel plating layer, and hot-dipped tin anti-oxidation layer. An electroplating hole design ensures uniform coating. In a 96-hour 5% salt spray test, no corrosion occurred in the contact area.
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