Snapshot

A Power Distribution Unit (PDU) is a device that takes electricity from a UPS (uninterruptible power supply) and routes it to individual servers inside a rack. A busway is a rigid copper or aluminum bar system mounted above or below rows of racks, replacing traditional cables and conduit. Together, PDUs and busway form the last mile of power delivery inside a data center, sitting between the building's main electrical system and the compute hardware.

The product & how money is made

Rack PDUs

A rack PDU mounts vertically inside a server cabinet. It receives a power feed (single-phase or three-phase, typically 208V or 415V) and fans it out to individual outlets for each server. Four tiers exist, at increasing price:

• Basic — power strip, no monitoring: $150–$350 per unit
• Metered — shows total power draw on a display: $300–$600
• Monitored — per-outlet power data sent to management software: $600–$1,200
• Switched — per-outlet on/off control plus monitoring: $1,000–$2,500

Source: IDC PDU comparison guide (32A, 0U configuration); Digital Infotech DC cost guide.

Smart (monitored/switched) PDUs hold ~61% of market revenue est.. AI data centers overwhelmingly buy three-phase, high-amperage (60A+) monitored or switched units at the upper end of the price range. A standard rack uses two PDUs (A+B redundant feeds). The hardware is copper busbars, circuit breakers, connectors, and an embedded processor for smart units; the management/monitoring software layer adds margin on top.

Busway

Overhead busway replaces cable trays running from the UPS room to the rack rows. Rigid copper bus bar sections are suspended from the ceiling, with tap-off boxes that drop power down to each rack. Busway is faster to install (no conduit bending or cable pulling) and easier to reconfigure when racks are added or moved.

Busway is sold per linear meter/foot and by amperage rating. The dominant current rating band is 801A–2,000A, with above-2,000A the fastest-growing segment as AI rack densities increase. Copper is the dominant conductor material; aluminum is growing for cost reasons. A busway run for a row of 20 racks costs roughly $50,000–$150,000 est. depending on amperage and length, compared to $80,000–$200,000 est. for equivalent cable-and-conduit installations.

Revenue model

Hardware sale (product revenue) plus recurring service contracts for monitoring software, firmware updates, and replacement units. Most PDU vendors bundle management software with the hardware. Vertiv and Eaton increasingly sell PDUs and busway as part of integrated row-level or modular power solutions rather than standalone SKUs.

Demand

The unit math: PDUs per MW

Each rack gets two PDUs (A+B redundancy). The number of racks per MW depends on rack power density:

Source: KAD8 rack density analysis (2025); Schneider Electric community PDU calculator.

AI racks need fewer PDUs per MW (fewer racks per MW) but each PDU must handle far higher amperage. A 60A+ three-phase switched PDU for an AI rack costs 3–5x more than a basic 20A PDU for a legacy rack est.. Net effect on dollar demand per MW: roughly flat to modestly positive even though unit counts fall.

Busway scales with physical row length, not rack count. A 1 MW AI cluster using 10 racks still needs a full busway run, so busway demand per MW stays relatively constant regardless of density. Busway adoption rate is also increasing as more new builds choose busway over cable-and-conduit for installation speed.

Contracted demand

• Vertiv — $15B total backlog (Q4 2025), book-to-bill 2.9x, organic orders up ~252% YoY in Q4 2025. Backlog includes PDUs, UPS, cooling, and racks bundled together; PDU-specific backlog not disclosed. contracted
• Eaton — Electrical Americas backlog ~$13.2B (Q4 2025), up 31% YoY. Data center orders up ~200% YoY. Total company backlog >$19B. contracted
• Schneider Electric — Sales backlog €21.4B (~$23B) at year-end 2024. Plans ~€2B in capacity expansion through 2027. contracted

Forecast demand

• JLL projects global data center capacity growing from ~100 GW (2025) to ~200 GW by 2030, a ~14% supply CAGR. Americas growing fastest at ~17% CAGR. est.
• Rack-PDU market forecast: $2.78B (2025) → $4.62B (2031) at ~9.0% CAGR. est.
• Busway market forecast: $5.30B (2025) → $9.60B (2032) at ~9.0% CAGR. North America busway: $2.18B → $3.87B at ~8.5% CAGR. est.
• AI rack density trending from 30–40 kW (cloud standard today) toward 100–150 kW as the repeatable upper bound for production AI, increasing per-unit PDU ASP even as unit volume per MW decreases. est.

Sources: JLL 2026 Global Data Center Outlook; Mordor Intelligence (PDU market); MarketsandMarkets (busway market).

Supply

Capacity

PDU manufacturing is copper busbars, circuit breakers, connectors, and embedded electronics — it does not require the specialized winding or insulating capabilities of transformer or UPS production. Multiple vendors worldwide produce PDUs, including regional Asian manufacturers that compete on cost below 10 kW. Current lead times of 8–16 weeks are short relative to transformers (52–78 weeks) or UPS (30–40 weeks).

High-density PDUs (60A+ per circuit, three-phase) are a newer product category with fewer qualified suppliers. The electronics, thermal management, and safety certifications for handling 50–100+ kW per rack are nontrivial, and this sub-segment has tighter supply.

Busway capacity

Busway manufacturing requires copper or aluminum extrusion, insulation layering, and assembly. The top five producers (Eaton, Schneider Electric, Siemens, ABB, Legrand/Starline) dominate. Schneider is investing ~€2B through 2027 across its electrical product lines, and Vertiv is raising capex to 3–4% of revenue in 2026 to expand manufacturing.

Bottlenecks

• Copper price — Both PDUs and busway are copper-intensive. Copper cost flows through to ASP.
• High-density product qualification — UL/IEC certification for 60A+ three-phase PDUs takes months, creating a barrier for new entrants.
• Integrated system bundling — Hyperscalers increasingly buy power distribution as part of integrated row-level or modular solutions (Vertiv's MegaMod, SmartRun), favoring vendors with full-stack offerings.
• Upstream equipment — PDUs and busway cannot be installed until the building, transformers, and UPS systems are in place. The binding constraint in the power chain is transformers (2–3 year lead times) and grid interconnection (55-month queues), not PDUs.

The gap

The PDU/busway layer is not severely supply-constrained in aggregate. PDU lead times (8–16 weeks) remain short enough that they rarely gate data center construction timelines. The bottleneck in data center power delivery is upstream — grid connections, transformers, and to a lesser extent UPS systems.

Within the PDU category, high-density (60A+) intelligent PDUs have fewer qualified suppliers and growing demand from AI deployments, tightening lead times for the high-end segment.

Pricing direction: upward, driven by ASP mix shift (higher-amperage, smarter units) rather than supply scarcity. Copper price increases pass through. Five major vendors hold 55–60% share est., with fragmentation below 10 kW.

Busway adoption rate is increasing because it is faster to deploy — a structural share gain from cable-and-conduit, adding growth on top of volume from new data center construction.

The players

Sources: Vertiv Q1 2026 press release, FY2025 via StockAnalysis; Eaton Q4 2025 results (TradingView, ElectricalTrends); Schneider Electric FY2025 (CompaniesMarketCap, FacilitiesDive); Lincoln Electric FY2025 (MarketBeat, Panabee). Market caps and P/E from StockAnalysis (Jun 3, 2026). Schneider forward P/E from EPA:SU listing (StockAnalysis).

Note on LECO: Lincoln Electric does not participate in the PDU or busway market. Relevant players in this sub-sector include VRT, ETN, Schneider (SBGSF/SBGSY), and Legrand (LGRDY). Legrand owns Server Technology (rack PDUs) and Starline (track busway), and acquired Power Bus Way in December 2024 to expand North American data center busway capacity.

The price of exposure

VRT — Vertiv Holdings

• FY2025 revenue: $10.2B (+28% YoY). Q1 2026 revenue: $2.65B (+30%). FY2026 guidance: $13.5–$14.0B (+29–31% organic).
• FY2025 net income ~$1.5B est. (trailing EPS ~$3.98 × ~385M shares).
• Adjusted free cash flow guidance FY2026: $2.1–$2.3B.
• At $127B market cap and ~$2.2B midpoint FCF: FCF yield ~1.7%. At ~$128B EV and $10.8B TTM revenue: EV/Sales ~11.8.
• Net leverage ~0.2x. $5B liquidity. Added to S&P 500 in March 2026.
• PDU-specific revenue not disclosed; PDUs are one product line among UPS, cooling, racks, DCIM, and modular solutions.

ETN — Eaton Corporation

• FY2025 revenue: $27.4B (+10% YoY). FY2025 adjusted EPS: $12.07. Free cash flow: $3.6B.
• Electrical Americas (50% of revenue): $13.3B TTM through Dec 2025, growing 16% organically. Backlog ~$13.2B, up 31%.
• At $164B market cap and $3.6B FCF: FCF yield ~2.2%. EV/EBITDA: ~29.1.
• Diversified — also makes aerospace, vehicle, and eMobility products. Data center share of Electrical Americas not disclosed.

SE (SBGSF) — Schneider Electric

• FY2025 revenue: €40.2B (~$44B, +5% YoY). Pretax income: €6.18B. P/E trailing: 38.7.
• Data center = ~20% of end-market exposure (pure DC), ~24% including networks, implying ~$8.8–$10.6B in DC-related revenue est..
• At $185B market cap, forward P/E ~32 est.. Backlog €21.4B.
• Broadest portfolio: APC (UPS, PDUs), Canalis/I-Line (busway), EcoStruxure (DCIM), switchgear, cooling.
• Investing ~€2B through 2027 in capacity expansion. North American energy management growing 25%+.

LECO — Lincoln Electric

• FY2025 revenue: $4.2B (+5.6% YoY). Net income: $521M. Free cash flow: ~$534M.
• At $14.4B market cap and $534M FCF: FCF yield ~3.7%. EV/EBITDA: ~18.4.
• Has no PDU or busway products. Revenue is from welding consumables, welding equipment, and robotic welding automation. This ticker does not provide exposure to the PDU/busway market.

What to deep-dive next

• Vertiv PDU-specific revenue — Vertiv does not break out PDU revenue from its broader product mix. Understanding how much of the $10.2B is PDU vs. UPS vs. cooling vs. racks requires 10-K segment analysis or management commentary.
• Eaton data center revenue share — Eaton does not disclose what percentage of Electrical Americas revenue comes from data centers. The Q4 2025 commentary ("data center revenue +40%, orders +200%") suggests fast growth but the base is unknown.
• Legrand (LGRDY) as the pure-play alternative — Legrand's Server Technology (PDUs) and Starline (track busway) brands sit squarely in this sub-sector. The December 2024 acquisition of Power Bus Way further concentrates Legrand's exposure. If the intent is PDU/busway-specific exposure, Legrand warrants analysis.
• High-density PDU pricing trend — Verify whether the ASP increase for 60A+ PDUs (estimated 3–5x vs. basic) is holding or compressing as more vendors qualify.
• Copper exposure — Both PDUs and busway are copper-intensive. Quantify what a 20% move in copper price does to margins for each vendor (passed through vs. absorbed).
• Vertiv's $15B backlog composition — How much is PDU/busway vs. UPS/cooling/modular? Product mix matters for margin forecasting.
• LECO ticker relevance — Confirm whether LECO was intended or if the target was Legrand (LEG / LGRDY).

Sources & confidence