Rack PDU for High-Density AI Data Centers
Rack PDUs distribute AC power from a single high-current input feed to multiple server, storage, and networking outlets within a rack. They are the last point of power distribution before the IT equipment and are available in basic (no monitoring), metered (inlet current monitoring), outlet-metered, and switched configurations. AI data center racks operating at 10–30+ kW require rack PDUs rated for high continuous current, with C19 outlets for high-power servers and GPU nodes, and outlet-metered or intelligent monitoring for DCIM integration. Rack PDUs are specified by input voltage, input current, outlet type, outlet count, form factor, and monitoring level.
How It Works
A rack PDU receives power from a branch circuit or busway tap-off unit at its input connector. Internal wiring distributes this power to multiple output receptacles. Basic PDUs provide no monitoring — they simply distribute power. Metered PDUs include a current transformer on the input to measure total load current, displayed on a local LED or LCD. Outlet-metered PDUs add individual current sensing on each outlet for per-device load visibility and DCIM integration. Switched PDUs add relay-controlled outlets for remote on/off control and sequenced power-up, enabling remote reboot without physical access to the rack.
Applications
- High-density AI server and GPU cluster rack power distribution
- Standard data center rack power feeds from busway tap-off or panel branch circuits
- Colocation data center metered rack power for tenant billing
- Edge data center and remote site rack power
- UPS output distribution to rack equipment
- Storage array and networking rack power
- OEM server platform power distribution
- Hyperscale and enterprise data center deployments
Key Technical Specifications
| Input Voltage | Single-phase 120V, 208V, 240V; three-phase 208V, 400V, 415V |
| Input Current | 16A, 20A, 30A, 32A, 63A — model dependent |
| Input Connector | IEC 60309, NEMA L5/L6/L14/L21, hardwired — specify |
| Outlet Types | C13, C19, NEMA 5-15, NEMA 5-20, IEC 60309, custom |
| Outlet Count | 8 to 48 outlets — model dependent |
| Form Factor | 0U vertical, 1U horizontal, 2U horizontal |
| Monitoring | None (basic), inlet metering, outlet metering, switched — specify |
| Communication | SNMP, Modbus TCP, REST API — intelligent models |
| Surge Protection | Optional integrated SPD — specify |
| Operating Temperature | 0°C to +45°C typical |
| Standards | IEC 60950, UL 60950, CE — confirm by model and market |
Specifications are indicative. Final parameters depend on manufacturing partner and project configuration. Contact us with your specific requirements.
Available Configurations
- Basic (no monitoring) — lowest cost, suitable for non-critical or edge applications
- Metered (inlet current) — total load visibility, local LED or LCD display
- Outlet-metered — per-outlet current monitoring for granular load management and DCIM
- Switched — per-outlet on/off control for remote reboot and power sequencing
- Metered + switched — full monitoring and control per outlet
- 0U vertical — mounts in rack side channel, maximises U space for IT equipment
- 1U/2U horizontal — standard rack unit mounting, front-accessible display
- Single-phase — for single-phase branch circuit feeds from busway or panel
- Three-phase — for three-phase feeds, balances load across phases
- High-density — C19 outlets for high-power AI servers and GPU nodes
- Dual-input A+B — redundant power feed for high-availability applications
Materials
Operating Conditions
- Input voltage: confirm single-phase or three-phase requirement and nominal voltage
- Input current: size PDU for 80% of rated input current at maximum continuous load (NEC/IEC 80% rule)
- Outlet type: specify C13, C19, NEMA, or mixed outlet configuration for the rack load
- Form factor: 0U vertical preferred for high-density AI racks to preserve U space
- Monitoring: specify metering level required for DCIM integration and power reporting
- Communication: specify SNMP, Modbus TCP, or REST API for intelligent PDU models
- Cord length: specify input cord length for overhead busway or underfloor power feeds
- Standards: specify UL, CE, or other certification requirements for the target market
Selection Guide
Rack PDU selection requires: (1) Input specification — voltage (single-phase or three-phase, nominal voltage), current rating, and input connector type matching the branch circuit or busway tap-off; (2) Outlet specification — outlet type (C13 for standard servers, C19 for high-power servers and GPU nodes), outlet count, and mixed outlet configurations for mixed loads; (3) Form factor — 0U vertical for high-density AI racks where every U is valuable; 1U/2U horizontal for standard racks or where a front-accessible display is required; (4) Monitoring level — basic for non-critical; metered for load visibility; outlet-metered for DCIM integration and per-device power reporting; switched for remote reboot capability; (5) Redundancy — dual-input A+B for high-availability applications; (6) Standards — specify UL, CE, or other certifications required for the target market and data center operator.
OEM & Custom Manufacturing
Custom rack PDU configurations are available for OEM server platform and data center infrastructure manufacturers. Custom options include non-standard outlet configurations, custom input connectors, specific monitoring and communication protocols (SNMP, Modbus TCP, REST API), custom cord lengths, private label manufacturing, and custom chassis dimensions. Provide your input specification, outlet requirements, monitoring requirements, and target quantity for a configuration review.
Submit Custom RequirementQuality & Testing
Rack PDUs for data center use should be sourced from manufacturers with IEC 60950 or UL 60950 certification. Input connectors and outlets should be rated for the specified current at the operating temperature. Internal wiring should be sized for the maximum continuous load current. For high-availability applications, specify PDUs with dual-corded input for A+B power feed redundancy. Verify outlet retention force meets IEC 60320 requirements for vibration-prone environments.
Frequently Asked Questions
What is the difference between a basic, metered, outlet-metered, and switched rack PDU?
A basic PDU provides no power monitoring — it simply distributes power to outlets. A metered PDU measures total input current (and sometimes voltage and power) at the PDU inlet, displayed on a local LED or LCD. An outlet-metered PDU adds individual current sensing on each outlet, enabling per-device load monitoring and DCIM integration. A switched PDU adds relay-controlled outlets for remote on/off control and sequenced power-up, enabling remote reboot without physical access to the rack.
What input current rating should I specify for a high-density AI data center rack PDU?
The NEC and IEC standards require that continuous loads do not exceed 80% of the circuit breaker or PDU input rating. For a 32A circuit, the maximum continuous PDU load is 25.6A. For a 63A circuit, the maximum continuous load is 50.4A. Size the PDU input rating so that your expected maximum rack load does not exceed 80% of the PDU input rating. For AI racks at 20–30 kW, a three-phase 32A or 63A input PDU is typically required.
What is the difference between 0U vertical and 1U horizontal rack PDUs?
A 0U vertical PDU mounts in the side channel of a rack (outside the standard 19" equipment space), preserving all rack unit space for IT equipment. A 1U or 2U horizontal PDU mounts in standard rack unit positions. 0U vertical PDUs are preferred for high-density AI racks where every U is valuable. Horizontal PDUs are used when side channel mounting is not available or when a front-accessible display is required.
Can rack PDUs be customised for specific outlet configurations and OEM applications?
Yes. Custom outlet configurations are available for OEM and large-volume projects. Custom options include mixed C13/C19 outlet counts, non-standard outlet types, custom outlet spacing, custom input connectors, specific communication protocols, and private label manufacturing. Provide your outlet count, outlet types, input specification, monitoring requirements, and form factor for a custom configuration review.
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