Power transmission busbar

Power distribution busbars | selection guide

Copper and aluminium busbars, flexible conductive links and mounting accessories for electrical panels and equipment. Selection depends on load current, material, dimensions, connection design and installation conditions.

Product group	Application and checks
Copper busbars	Rigid conductive links in panels. Copper offers good conductivity; check dimensions, contact area and supports.
Aluminium busbars	A lighter solution. Equivalent conductivity usually requires a larger cross-section than copper; use connections suitable for aluminium.
Flexible copper busbars	Links in confined spaces, for assembly offsets or vibration compensation where the specific product design permits.
Tinned flexible busbars	Flexible copper conductors with a tin coating that reduces surface oxidation. Check insulation, temperature limits and connection method.
Busbar accessories	Support insulators, clamps and connection components. Match busbar dimensions, voltage, current and mechanical loads.

For a solid rectangular busbar: S = width × thickness. For example, 30 × 5 mm = 150 mm². The conductive cross-section of a flexible laminated busbar comes from its copper layers or manufacturer data; external dimensions including insulation are not the conductive cross-section.

Cross-section alone does not determine current capacity. Consider ambient temperature, cooling, bar arrangement, AC/DC operation, connections and allowable temperature rise. Use the specific manufacturer’s tables and a verified panel design; a universal A/mm² value can be misleading.

• Check load and short-circuit currents, insulation clearances and support spacing.
• Prepare contacts and tighten bolts using the manufacturer’s method and torque.
• For Cu–Al joints use an approved connection system; tin coating alone does not guarantee compatibility.
• A bare busbar is not insulated. Provide suitable supports, covers and protection against contact. DIN rail mounting applies only to systems designed for it.
• Check flexibility, bend radius and movement limits in the product documentation. Not every flexible busbar is suitable for repeated flexing.

Are Cu and Al busbars of the same size equivalent?

No. Conductivity, weight and connection requirements differ. Select replacements using complete system data.

Is a tinned busbar insulated?

No. Tin is conductive. Insulation, where provided, is a separate layer.

Is the current rating enough to select a busbar?

No. Fazė reminds us to check temperature rise, short-circuit withstand, supports and connections together.

Need help selecting?

Provide current, AC/DC operation and voltage, busbar dimensions or a drawing, installation location and connected equipment details.

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