For system integrators, panel builders, and electrical engineers managing large-scale data center infrastructure, powering industrial server racks at scale is not simply about wattage—it is about efficiency, redundancy, and the ability to handle the unprecedented power densities of AI and high-performance computing workloads. A single rack can now draw 100kW or more, and the power distribution architecture must deliver clean, stable DC power with minimal losses from the utility feed to the server load.
TPS Elektronik’s EA-PSBE 11000-40 3U is a high-performance programmable bidirectional DC power supply from the EA-PSBE 10000 series. It accepts 208–480V AC three-phase input (±10%) and delivers 0–1000V DC at 0–40A with up to 15kW output power. With up to 96% efficiency in both source and sink modes, regenerative energy recovery, and master-slave scalability for up to 64 units (1920kW total), this 480V power supply is engineered for data center infrastructure where reliability, efficiency, and scalability are non-negotiable.
1. The Data Center Power Challenge: 480V Distribution and Rack-Level Reliability
Modern data centers are experiencing an unprecedented demand for power. AI training clusters, high-performance computing, and hyperconverged infrastructure can consume 100kW or more per rack, driving a fundamental rethinking of power distribution architecture.
In North America, the utility feed typically enters the data center at 480V three-phase AC. Traditionally, this voltage is stepped down to 208V/120V single-phase for IT equipment—a conversion that introduces power losses of approximately 3% at the transformer alone. Leading hyperscale operators are increasingly distributing 480V three-phase power directly to racks, using it to power high-efficiency rectifiers that convert AC to DC with minimal losses. Some modern data centers are adopting 415V AC or even 480V AC three-phase to further enhance energy efficiency.
For system integrators and electrical engineers, this shift creates new requirements:
- Direct 480V AC input capability: Power supplies must accept 480V three-phase input without requiring step-down transformers
- High efficiency at high power: Every percentage point of efficiency translates to significant energy savings at multi-megawatt scales
- Redundancy: N+1 or N+N configurations are essential for Tier 3 and Tier 4 data center reliability
- Scalability: Power systems must grow with demand without replacing existing infrastructure
- Energy recovery: Regenerative loads that return energy to the grid reduce operating costs and heat generation
The EA-PSBE 11000-40 3U addresses each of these requirements, delivering a 480V AC input power supply with the efficiency, redundancy, and scalability that modern data center infrastructure demands.
2. Product Overview: EA-PSBE 11000-40 3U 480V Power Supply
The EA-PSBE 11000-40 3U is a high-performance programmable bidirectional DC power supply from the EA-PSBE 10000 series, designed for two-quadrant operation as both a power source and a regenerative electronic load. It is available as a 3U rack-mountable unit, making it suitable for integration into standard 19-inch data center and industrial racks.
Key specifications for data center infrastructure applications:
- Output: 0–1000V DC, 0–40A, up to 15kW
- Input: 208–480V AC (±10%) three-phase, 45–66Hz, with active PFC >0.99
- Efficiency: Up to 96% in source and sink modes
- Regulation modes: CV, CC, CP, CR with fast crossover
- Regulation accuracy: Voltage ≤0.05% FS, Current ≤0.1% FS
- Display: 5-inch color TFT touchscreen with intuitive user interface
- Interfaces: Galvanically isolated USB, Ethernet, analog (0–5V/0–10V); optional CAN, CANopen, Profibus, EtherCAT, Profinet, Modbus
- Command languages: SCPI and ModBus, LabVIEW, IVI drivers
- Form factor: 3U rack-mountable, suitable for desktop or rack installation
- Scalability: Master-slave parallel operation for up to 64 units
The EA-PSBE 10000 series is the economy variant of the EA-PSB 10000 series, offering the same power, connectivity, and bidirectional functionality while reducing costs through streamlined software features. This makes it an ideal choice for data center infrastructure applications where core performance and reliability are paramount, and advanced software features are not required.
3. Wide Three-Phase Input: 208–480V for Global Data Center Deployment
Data centers operate on different grid voltages depending on their geographic location. In North America, 480V three-phase is the standard for large-scale facilities; in Europe and many other regions, 380V or 400V three-phase is common. The EA-PSBE 11000-40 3U accepts 208–480V AC three-phase input (±10%), covering the full range of global data center voltages.
This wide input range delivers several benefits for data center infrastructure:
- Global deployment: A single power supply platform can be deployed in data centers worldwide without regional variants
- Direct 480V operation: Eliminates the need for step-down transformers at the rack level, reducing power losses and simplifying installation
- 208V compatibility: Supports facilities that operate at 208V three-phase (with derating to 9kW at 208V)
- Active PFC: Power factor correction >0.99 ensures efficient use of the facility’s electrical infrastructure and minimizes harmonic distortion
For 480V data center power distribution, the ability to accept 480V AC input directly is a significant advantage. Data centers that distribute 480V three-phase to racks and use it to power rectifiers can avoid transformer losses of up to 3%, improving overall facility efficiency. The EA-PSBE 11000-40 3U’s wide input range and high efficiency make it an ideal building block for these high-efficiency architectures.
4. Bidirectional Power with Energy Recovery: Up to 96% Efficiency
One of the most distinctive features of the EA-PSBE 11000-40 3U is its bidirectional capability. Unlike conventional power supplies that only source power, this unit functions as both a power supply (source) and an electronic load (sink) in a single device. The switchover between these two operating modes occurs without interruption or time loss.
In load (sink) mode, the device recovers the consumed DC energy and feeds it back into the local power grid with efficiency up to 96%. This regenerative capability is particularly valuable for data center applications where:
- Battery testing and conditioning: UPS battery strings require periodic testing and conditioning; the regenerative load returns energy to the grid rather than dissipating it as heat
- Power supply validation: Testing redundant power supplies and rectifiers can be performed with energy recovery, reducing operating costs
- DC-DC converter testing: Characterizing the efficiency of on-board DC-DC converters used in server and networking equipment
The high efficiency of up to 96% in both source and sink modes translates to significant energy savings at scale. In a large data center with multiple power supplies, the combination of high conversion efficiency and regenerative energy recovery can reduce total cost of ownership and minimize the heat load on the facility’s cooling infrastructure.
For 480V data center power supply applications, the bidirectional capability and energy recovery make the EA-PSBE 11000-40 3U an ideal solution for power infrastructure testing, battery system validation, and on-board charger testing.
5. Redundancy and Scalability: N+1, N+N, and 64-Unit Parallel Systems
Data center reliability depends on redundant power architectures. The EA-PSBE 11000-40 3U supports both N+1 and N+N redundancy configurations through its master-slave parallel operation capability.
N+1 Redundancy: One backup unit per critical path, providing protection against a single power supply failure. This is the standard configuration for Tier 2–3 facilities. For a 60kW load, an N+1 configuration would use five 15kW units—four active and one redundant.
N+N Redundancy: Full duplication of every power path, providing maximum protection against failures and enabling maintenance without downtime. This is typical for Tier 4 facilities where continuous operation is required.
The EA-PSBE 11000-40 3U’s master-slave bus enables parallel operation of up to 64 units of all power classes in the 10000 series, delivering a total of up to 1920kW of combined output power. The galvanically isolated Share-Bus ensures current balancing between parallel units, preventing any single unit from being overloaded.
This scalability is essential for data center infrastructure where:
- Power requirements grow over time: New racks and equipment can be added without replacing existing power infrastructure
- Multiple power zones: Different racks or pods may have different power requirements that can be served by a scalable power system
- Redundancy requirements vary: Different tiers of service may require different levels of redundancy, all supported by the same scalable platform
6. Comprehensive Protection for Critical Infrastructure
Data center power infrastructure must protect both the equipment and the facility from electrical faults. The EA-PSBE 11000-40 3U includes comprehensive protection features:
- OVP (Overvoltage Protection): Adjustable from 0–110% of rated voltage, protects connected loads from voltage excursions
- OCP (Overcurrent Protection): Prevents damage from excessive current draw
- OPP (Overpower Protection): Shuts down the output if power exceeds safe limits
- OTP (Overtemperature Protection): Reduces output or shuts down if internal temperature exceeds safe operating limits
For critical infrastructure 480V power applications, these protection features are essential—data center equipment represents significant capital investment, and protection against electrical faults prevents costly damage and downtime.
The unit also features remote sensing with automatic detection, compensating for voltage drops in cables and ensuring that the voltage at the load is exactly what is programmed. This is particularly important in data center applications where cable runs can be long and voltage drops significant.
For redundant 480V server power applications, the combination of comprehensive protection, remote sensing, and scalable parallel operation ensures that critical infrastructure receives clean, stable, protected power—from the utility feed through the power supply to the server load.
7. Technical Specifications at a Glance
| Parameter | Specification |
|---|---|
| Model | EA-PSBE 11000-40 3U |
| Output Voltage | 0–1000V DC |
| Output Current | 0–40A |
| Output Power | 0–15kW |
| Input Voltage | 208–480V AC ±10%, 3-phase, 45–66Hz |
| Power Factor | >0.99 (active PFC) |
| Efficiency | Up to 96% |
| Voltage Accuracy | ≤0.05% FS |
| Current Accuracy | ≤0.1% FS |
| CV Load Regulation | ≤0.05% FS |
| CC Load Regulation | ≤0.1% FS |
| Regulation Modes | CV, CC, CP, CR |
| Resolution | 16-bit ADCs and DACs |
| Display | 5″ color TFT touchscreen |
| Interfaces | USB, Ethernet, Analog, Master-Slave, Share-Bus |
| Protection | OVP, OCP, OPP, OTP |
| Parallel Operation | Up to 64 units (1920kW total) |
| Form Factor | 3U rack-mountable |
View the full EA-PSBE 11000-40 3U datasheet →
