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  • New item   Copper busbar | 40 × 10 mm | 4 m | Elsp Group | ESV40X10
    New item   Copper busbar | 40 × 10 mm | 4 m | Elsp Group | ESV40X10 1

    Copper busbar | 40 × 10 mm | 4 m | Elsp Group | ESV40X10

    Code: ESV40X10
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    Rigid copper busbar 40 × 10 mm (400 mm²), 4 m length for phase, N and PE main bars in switchboards. Indicative current rating per DIN 43671 – 715 A (bare, AC, +35 °C). Bar weight – about 14.3 kg.

  • Product description

    Copper busbar | 40 × 10 mm | 4 m | Elsp Group | ESV40X10

    Rigid flat electrolytic copper busbar 40 × 10 mm, 4 m length. For L1–L3, N and PE main bars in distribution boards, transformer substations, UPS, battery and solar DC systems.

    Key point:
    Cross-section – 400 mm². Indicative continuous current rating per DIN 43671 – 715 A (one bare bar per phase, AC, ambient +35 °C, busbar temperature +65 °C). In a closed enclosure the rating is lower, for a painted bar higher, so the final size is confirmed by the switchboard designer.
    Cross-section
    400 mm²
    Current rating (DIN 43671)
    715 A
    Bar weight
    ~14.3 kg
    Length
    4 m

    How it works

    The busbar is fixed in the switchboard on insulated supports and connected to device terminals, switch-disconnectors and other bars by bolted joints. Before jointing, contact surfaces are cleaned to bare metal and coated with contact compound.

    The flat 40 × 10 mm profile has a large cooling surface, so the bar dissipates heat well and carries high current at low resistance – about 43.1 µΩ/m at 20 °C.

    With the right size and quality joints, the main bar runs without overheating, and losses and voltage drop at the joints stay minimal.

    Why choose a 40 × 10 mm busbar?
    It distributes up to 715 A through a single rigid conductor: no cable bundles, neat bolted tap-offs and a clear phase layout in the switchboard.

    Technical specifications

    Product type Rigid flat copper busbar
    Manufacturer / code Elsp Group – ESV40X10
    Material Electrolytic copper (Cu-ETP / M1), ~99.9 % Cu
    Dimensions (width × thickness) 40 × 10 mm
    Length 4 m
    Cross-section 400 mm²
    Weight per 1 m ~3.58 kg
    Bar weight ~14.3 kg
    Resistance at 20 °C ~43.1 µΩ/m
    Current rating per DIN 43671 715 A
    Equivalent power ~495 kW (400 V, 3-phase, cos φ = 1)
    Weight and resistance are calculated with a copper density of 8.96 g/cm³ and resistivity of 0.01724 Ω·mm²/m. DIN 43671 conditions: bare busbar, AC, ambient +35 °C, busbar +65 °C.

    Key functions

    • Main bar – L1–L3, N and PE bars in the switchboard with a single rigid conductor.
    • Low resistance – about 43.1 µΩ/m, so lower losses and voltage drop.
    • Neat tap-offs – devices are bolted directly to the bar.
    • Earthing bar – main earthing or equipotential bonding bar.
    • Workable on site – the bar can be cut, drilled and bent to suit the switchboard.

    How does it differ from similar busbars?

    • 30 × 10 mm – smaller cross-section – 573 A, for lower loads.
    • 50 × 10 mm – larger cross-section – 852 A, for higher loads or closed enclosures.
    • Aluminium busbar – lighter and cheaper, but needs ~1.6 times the cross-section for the same resistance, plus Cu–Al transition joints.
    • Flexible busbar – for short connections between devices and vibration compensation; a rigid bar is for main bars.

    Where is it used?

    • Distribution boards and MCCs – phase, N and PE main bars.
    • Transformer substations – 0.4 kV side connections and incomers to LV switchboards.
    • UPS and battery systems – DC bars where current is high and voltage low.
    • Solar plants – main bars in AC and DC boards.
    • Earthing – main earthing bar, equipotential bonding.
    • Industrial equipment – power connections in control and distribution cabinets.

    Use by need

    Switchboard builder.
    Uniform main bars for phases, N and PE – clear design and fast assembly.
    Power engineer and contractor.
    Substation 0.4 kV side and main board connections with a known current rating.
    UPS and battery integrator.
    Low resistance in the DC bar – less voltage drop and heating.

    Practical use

    If the switchboard needs a main bar with a design current of up to 715 A, a 40 × 10 mm busbar is suitable per DIN 43671 in an open installation. If the enclosure is closed and warm, choose a larger cross-section or a painted bar – decide this with the designer.

    Pros

    • High current rating – 715 A per DIN 43671.
    • Low resistance – about 43.1 µΩ/m.
    • Rigid profile – holds its geometry and withstands fixing loads.
    • Easy to work – can be cut, drilled and bent.
    • Known weight – ~14.3 kg per bar, easy to plan transport and installation.

    Cons / limitations

    • Bare bar – requires insulated supports, clearances and protective covers.
    • Copper is heavier and costlier than aluminium – consider aluminium for long runs.
    • Rating depends on conditions – lower than the table value in a closed enclosure.
    • Not for vibration or movement – use flexible busbars there.

    Safety and installation notes

    • Before work, isolate the supply, secure it against switching on and verify that no voltage is present.
    • Clean contact surfaces and apply contact compound.
    • For bolted joints use class 8.8 bolts with disc spring washers, tightened to the manufacturer's torque.
    • Set support spacing according to the short-circuit current.
    • Connect copper to aluminium only via Cu–Al transition joints.
    • Cover bare live parts; installation must be carried out by a qualified electrician.

    Quick selection guide

    If the switchboard needs a main bar with a design current of up to 715 A, a 40 × 10 mm busbar is suitable per DIN 43671 in an open installation. If the enclosure is closed and warm, choose a larger cross-section or a painted bar – decide this with the designer.

    40 × 10 mm
    400 mm²
    715 A
    4 m
    Suitable when you need:
    • a main bar up to 715 A per DIN 43671;
    • a phase, N or PE bar in a switchboard or substation;
    • a low-resistance DC bar.
    Check before use:
    • the design current and enclosure temperature;
    • the short-circuit current and support spacing;
    • device terminal width and bolt hole positions.
    Important reminder: the busbar does not replace a switchboard design – current rating, clearances and short-circuit withstand are confirmed by the designer to IEC 61439.

    FAQ

    What current can a 40 × 10 mm busbar carry?
    Per DIN 43671 – 715 A (bare, AC, +35 °C); less in a closed enclosure.
    How much does the bar weigh?
    About 3.58 kg/m, the whole 4 m bar – about 14.3 kg.
    How many kW can it carry?
    In a three-phase 400 V system at cos φ = 1 – about 495 kW.
    Can it be used for DC?
    Yes; resistance is about 43.1 µΩ/m, used to calculate voltage drop in a DC bar.
    Do two bars per phase give double the current?
    No, about 1.6–1.8 times more, because parallel bars heat each other.
    Can the bar be cut, bent and painted?
    Yes; bend only with a tool and leave contact areas unpainted.

    Copper busbar | 40 × 10 mm | 4 m | Elsp Group | ESV40X10

    Rigid copper 40 × 10 mm (400 mm²) busbar for switchboard, substation and DC main bars: 715 A per DIN 43671, ~14.3 kg per 4 m bar.

    Illustrative image may have been created using AI. The appearance of the product may differ slightly from the image shown. Please refer to the technical specification.

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