Applications
Applications
Where CUPAL solves the copper-aluminium transition problem
Where copper meets aluminium
Every electrical installation has a handful of points where an aluminium conductor is bolted to a copper one: the riser busbar in a transformer substation meeting the copper busbar of the main distribution board, the aluminium bar system in a switchgear cabinet meeting a copper cable lug, a lightning-protection down-conductor meeting the earthing network. These joints are the most common failure points in the system — not because they are badly torqued, but because the electrochemical potential difference between the two metals (around 2 V) starts galvanic corrosion in the presence of moisture. A CUPAL bimetal transition removes that. The six areas below show which CUPAL form (sheet, washer, strip, cable lug) is the proven answer in each industry, and which standard applies.
Switchgear & Distribution Panels
Where aluminium feeders meet copper busbar — a bolted joint that stays stable without paste, with EN 10204 2.2 on every shipment and 3.1 on request.
Cable Lugs & Connectors
Aluminium cable onto a copper terminal — a CUPAL washer in the bolted joint, or a CUPAL plate between lug and bar.
Marine Bonding & Masts
Salt spray turns a copper-to-aluminium joint from a slow problem into a seasonal one. CUPAL washers and plates take the couple out of the mast, the bonding system and the lightning path.
Lightning Protection
Three metals meet in every earthing system. The Al/Cu interface is the weak spot — CUPAL strip and transition pieces remove it.
Renewable Energy
Copper–aluminium transitions for solar, wind, BESS and EV charging systems — free of galvanic corrosion, lasting 15+ years.
Electric Vehicles & Charging Infrastructure
On the vehicle side — HV junction box, cable terminations; on the infrastructure side — MCS 1500 A. One bimetal material for both.
Busbars
Short-circuit-rated Cu/Al transitions — cut precisely to your busbar geometry.
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