Premium PSU launches the PDR-110K: 110kW 800Vdc power shelf for AI data centers
Premium PSU launches the PDR-110K: a 110kW 800Vdc power shelf for AI data centers
A 3RU modular AC/DC power shelf that turns a three-phase supply into a regulated 800Vdc bus for AI and high-density server racks.
Premium PSU introduces the PDR-110K, a 3RU modular power shelf that converts a three-phase AC supply into a regulated 800Vdc bus. One shelf delivers up to 110kW from six hot-pluggable 18.5kW rectifier modules, managed by a hot-pluggable controller. It is designed for AI and high-density server racks in hyperscale, colocation and enterprise data centers.
Why 800Vdc in the AI rack
Rack power in AI data centers keeps rising, and the industry is moving power distribution to higher DC voltages — for example, NVIDIA has outlined an 800 VDC power architecture for AI factories. The reason is current.
Distributing power at 800Vdc instead of a low-voltage bus reduces the current for the same power by a factor of about 15. At 110kW, the PDR-110K output carries approximately 139A (at 790Vdc), while a 52Vdc bus would need about 2,115A. Lower current allows smaller busbars and cables and reduces conduction losses in the rack. We cover the architecture in more depth in The 800 VDC revolution: the energy engine behind AI.
What the PDR-110K delivers
- 110kW per shelf from 415 to 528Vac line-to-line; 100kW from 311 to 415Vac.
- Wide three-phase input: 311 … 528Vac line-to-line, 3-phase + PE, 50/60Hz.
- Tight output regulation: 810Vdc at no load and 790Vdc at full load, ±0.25% accuracy at 100% load, ripple and noise ≤8Vp-p.
- Efficient rectifiers: each 18.5kW module achieves >97% efficiency at 50 … 100% load and PF ≥0.98 at 20 … 100% load.
- Compact: 3RU, front-to-back airflow with internally controlled variable-speed fans.
Built for uptime and data center operations
Rectifier modules and controller are hot-pluggable: a module can be replaced during operation while the remaining modules share the load. The controller provides telemetry through an RJ45 Ethernet port with Redfish and SNMP northbound and PMBus/SMBus to the rectifiers, plus a Web GUI, three-colour status LEDs and a reset button. Controller and rectifier firmware can be upgraded in the field through the bootloader.
The shelf also supports a battery backup unit (BBU) interface. For the role of BBUs and energy storage in AI load transients, see LIC, BBU and the 1–50 ms window; for converter management protocols, see Manageable power converters: PMBus, Redfish and SCMI.
Scalable from 110kW to 660kW
Up to six PDR-110K shelves can operate in parallel with current sharing, for a total of up to 660kW. Rack power can grow in 110kW steps with the same shelf and the same management interface.
Key specifications
| Parameter | PDR-110K |
|---|---|
| Input voltage range | 311 … 528Vac L-L, 3-phase + PE, 50/60Hz |
| Output voltage | 800Vdc nominal (810Vdc no load / 790Vdc full load) |
| Rated output power | 110kW at 415 … 528Vac; 100kW at 311 … 415Vac |
| Rectifier modules | 6 × 18.5kW, hot-pluggable |
| Parallel operation | Up to 6 shelves (up to 660kW) |
| Monitoring | RJ45 Ethernet, Redfish / SNMP, Web GUI, BBU interface |
| Size and cooling | 3RU, 830 × 438 × 131mm, front-to-back airflow |
| Environment | -5 … +45°C, up to 3050m, IP20 |
| Reliability and compliance | MTBF ≥300,000h; designed to meet cULus, CE and RoHS requirements |
Planning an 800Vdc rack architecture?
Download the PDR-110K datasheet, see the product page or contact our Sales Department to discuss your data center project. Several references are subject to special MOQs and lead times.
