AX5-33 50 VDC Power Shelf | AC to 50 VDC for AI & ORv3 Racks
3-Phase AC to 50 VDC Power Shelf / ORv3 AI Rack Infrastructure (21″)
Deliver high-efficiency 50 VDC power from single- or three-phase AC sources for AI and accelerated computing environments.
AX5-33 50 VDC Power Shelf
Deliver high-efficiency 50 VDC power from single- or three-phase AC sources for AI and accelerated computing environments. AX5-33 converts AC directly to regulated 50 VDC at the rack, eliminating server-level AC-DC conversion and simplifying rack power design.
per 1OU shelf
adjustable
4 shelves in parallel
peak
AC to 50 VDC power for AI infrastructure
The AX5-33 Power Shelf is a high-density AC-DC platform designed for GPU clusters, AI compute, and ORv3 rack deployments. Using six 5.5 kW hot-swappable modules, AX5-33 provides up to 33 kW of continuous 50 VDC output in a compact 1OU form factor.
AX5-33 supports universal three-phase wye input and delivers tightly regulated 50 VDC output with flexible redundancy. The integrated PMC control architecture enables system-level monitoring and coordinated operation across parallel shelves, while the modular BBU system provides scalable ride-through capability. Multiple shelves can be deployed in parallel to support AI rack power systems up to 132 kW.
Built for high-density AI rack power
Compact AC-DC shelf for AI and GPU rack deployments, without consuming valuable rack space.
Six hot-swappable PSUs scale capacity in 5.5 kW increments within each shelf.
Designed for Open Compute 21″ rack environments and high-density rack architectures.
Supports N+0, N+1, and N+N configurations to match availability requirements.
Modules can be added or serviced without interrupting operation for continuous uptime.
System-level monitoring, communication, and coordination across shelves over Modbus and CAN.
Scalable ride-through from a hot-swappable BBU shelf, integrated with PMC monitoring.
Deploy up to four paralleled AX5-33 shelves for rack power systems up to 132 kW.
Rack-level DC delivery in the Xtreme Power portfolio
AX5-33 operates as a rack-level AC-to-DC power platform, delivering 50 VDC directly to IT equipment. It is selected when rack-level DC delivery and a simplified power architecture are prioritized.
AC distribution to racks — conventional rack power for standard IT loads.
AC to 50 VDC conversion at the rack, removing server-level AC-DC stages.
Centralized 800 VDC architectures for facility-scale distribution.
Technical specifications
| Capacity | |
|---|---|
| System capacity | 33 kW (N+0) / 27.5 kW (N+1) / 16.5 kW (N+N) |
| Module rating | 5.5 kW (PSU5-55) |
| Input | |
| Shelf, three-phase | 346V to 480V, three-phase wye (5-wire, 3PH + N + PE) |
| Shelf, single-phase | 200V to 277V nominal (2W + PE), range 180V to 305V |
| PSU | 200 / 208 / 220 / 240 / 277 V nominal single-phase, range 180V to 305V |
| DC input | 180V to 400V DC (240V nominal); start-up 180V, power off 175V |
| Input configuration | Two AC inputs, three PSU positions on each; 2 × 30A NEC or 32A IEC, one per input. Single-input variant also available |
| Output | |
| Voltage | 50 VDC (adjustable) |
| Current | 113 A per module; 674 A maximum per shelf |
| Current sharing | Active and droop |
| Power module | |
| Power rating | 5.5 kW per PSU5-55 module |
| Hot swap | Yes |
| Efficiency | Up to 97.5% |
| Communication & control (PMC) | |
| Function | Aggregates module data and enables system-level monitoring and control |
| Protocols | RS485 Modbus (rack-level), CAN (inter-shelf) |
| Addressing | Automatic Modbus and CAN address allocation across shelves |
| Connectivity | 4 × RJ45 (daisy-chain and inter-shelf control) |
| Scalability | Coordinated operation across parallel AX5-33 and BBU shelves |
| Serviceability | Hot-swappable with firmware upgrade support (no power interruption) |
| Modular battery backup (BBU) | |
| Type | Modular battery shelf (2OU) |
| Power | Up to 33 kW per shelf |
| Runtime | >90 sec @ 5.5 kW · >240 sec @ 4 kW |
| Scalability | Parallel shelf capable |
| Service | Hot-swappable modules |
| Control | Intelligent BMS, Modbus |
| Environmental | |
| Operating temperature | −5°C to +45°C (23°F to 113°F) |
| Mechanical | |
| Dimensions (W×D×H) | 21 × 28.3 × 1.8 in (537 × 720 × 46 mm) |
| Rack compatibility | ORv3 (21″) |
| Shelf connectors | Amphenol 10173750-07P01 input; FCI BarKlip BK600 10164745-1SP092LF output |
| System architectures | |
| Direct 50 VDC | AC → AX5-33 → 50 VDC load |
| 800 VDC | AC → AX8 → DX8 → 50 VDC load |
| Parallel operation | |
| Scaling | Up to 4 shelves / 132 kW total |
| Compliance | |
| EMC | EN 61000-4-2, EN 61000-3-12, EN55022, FCC Part 15, CISPR 22 Class A |
| Safety | |
| Standards | EN 62368-1, UL 62368-1, IEC 62368-1 |
Capacity guidance: 1 shelf up to 33 kW · 2–3 shelves for mid-density AI racks · 4 shelves up to 132 kW.
Datasheets & references
Plan rack power infrastructure with confidence
Work with Xtreme Power to design and deploy rack-level power systems tailored to your application and density requirements. Prefer to connect directly? Contact our team at DCsales@xpcc.com or call (800) 582-4524.