The VB-H400 is a 21-inch 2U high-voltage BBU battery backup unit: 11.6 kWh at ±400VDC, ≥97% efficiency at the bus, and a dual-bus architecture that is 800VDC ready — built for the rack power architecture the industry has already put dates on.
| DC bus | ±400VDC |
|---|---|
| Capacity | 11.6 kWh |
| Efficiency | ≥97% at bus |
| Form factor | 21" rack, 2U |
| Cells | 21700 LFP · 416S equiv. |
| Bus roadmap | 800VDC ready (dual bus) |
| Safety data | UL 9540A test data path |
| Scaling | Up to 80kW-class bay |
NVIDIA has announced an 800 VDC data-center power architecture to feed Kyber racks — 576 Rubin Ultra GPUs each — landing in 2027, and showed an 800V sidecar at GTC 2025. Vertiv lists its 800VDC portfolio for the second half of 2026. And Delta already fields a 72kW 2U ±400VDC BBU — the same form-factor class as VB-H400. High-voltage backup is no longer a concept; it is a procurement line item.
REF — NVIDIA 800 VDC announcement · Vertiv 2H2026 portfolio · Delta 72kW 2U ±400VDC (public references)
NVIDIA puts an 800V sidecar on display at GTC and announces the 800 VDC architecture for future racks.
The first mainstream 800VDC data-center power products reach availability from a major vendor.
NVIDIA's Kyber rack — 576 Rubin Ultra GPUs — is slated to run on the 800 VDC architecture.
Our high-voltage shelf sits on the bus the transition actually starts at, with a dual-bus path to the 800 VDC step.
| Parameter | VB-H400 |
|---|---|
| Form factor | 21" rack shelf, 2U |
| DC bus | ±400VDC |
| Capacity | 11.6 kWh |
| Cell platform | 21700 LFP, 416S equivalent |
| Efficiency | ≥97% at bus |
| Bus architecture | Dual bus, 800VDC ready |
| Parallel scaling | Up to 80kW-class bay |
| Safety data | UL 9540A test data path (per product) |
| Dimensions | 482.6 W × 85 H × 620 D mm (2U) |
| Weight | 18.6 kg excl. busbars |
| Compliance | UN 38.3 tested · IEC 62619 designed & tested · CE (DoC) |
| EU readiness | EU Battery Regulation 2023/1542 ready |
| Warranty | 5 years |
UL 9540A is a test method — VoltBridge provides test data per product, not a listing
FIG.03 — VB-H400 in a high-voltage backup bay · 1024x1536
At ±400VDC, the same power flows at far lower current and through far less copper — which is why the industry's in-row systems are converging on high-voltage backup shelves instead of growling 48V drawers.
If the rack roadmap touches 800 VDC, send us the architecture — we map where ±400VDC backup slots in today and what the 800 VDC step changes.
Tell us your rack architecture and bridge-time target. Engineering reply within 48 hours, sample units available for qualified projects.
VB-5125 · VB-E3 · VB-H400
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