Soluzioni di Barre per Distribuzione di Potenza nei Data Center

Hyperscale racks built on the open rack platform distribute DC power along vertical busbars mounted inside the cabinet, and trays or blades draw power from wherever they sit. The enabling interface is an open-sided, blind-mate connector that clips onto the rack busbar: because the clip has no end stop, it can be positioned at any U-height along the bar, and single-pole clips are used in pairs — one per polarity — to complete the current loop.

Reference ratings for this class of in-rack interface, drawn from industry datasheets: up to 130 A maximum, about 105 A at a 30 °C temperature rise, falling to roughly 85 A when the interface feeds a single 6 AWG cable. The insulation class is typically 600 VAC / 850 VDC, and the connector is load-pluggable — rated for controlled hot-swap interruption at 24 V open circuit — which is what allows trays to be added or pulled without powering down the rack. Insertion force is low, around 12 N typical, and the clip seats through a float-mount insulator that absorbs cabinet misalignment during blind insertion. The mating surface is a nickel-plated copper bar near 3 × 38 mm, terminated to 6 AWG wire; higher-output generations arrive as a two-pole module carrying three 8 AWG high-flex cables per pole.

A second design question inside the rack is noise. Rectifiers switching at the mid-plane inject ringing onto the power path, and cable distribution couples it straight onto sensitive data planes. A multi-layer laminated busbar interleaves ground planes between power conductors; the added inter-plane capacitance shunts switching noise away before it reaches the backplane. The EMI-reduction mechanism is the same plane-coupling principle explained in our low-inductance busbar design article, where forward-return plane overlap is covered in detail.

Reference server-side designs illustrate the rest of the package: blade and receptacle bars insulated with powder coat meeting a 500 VDC dielectric requirement against nearby cabinet metal; floating lead-in contacts that guide blind engagement, with silver plating keeping voltage drop and insertion-cycle wear low; and selected copper sections extruded rather than machined to cut cost. A 43U router build distributed twelve discrete conductors from the laminated bar to mid-plane outputs, with flexible cable tails exiting into floating blind-mate connectors that mate directly to the rectifiers. Where continuous current inside sealed racks climbs, replacing discrete wires with laminated distribution is what holds temperature rise down — sizing guidance for that trade is in the busbar ampacity chart, and the stacked geometry itself is shown under multi-layer insulated busbars.