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Delivered rock-solid -48VDC power with excellent efficiency for our telecom racks.
789934-B21
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HPE 2650W -48VDC Platinum HP PS Kit
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789934-B21
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- HPE 2650W -48VDC Platinum HP PS Kit
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789934-B21 Overview
789934-B21 is an 850W power supply that comes in a modular design with an ATX form factor and is 80 PLUS Gold certified. It operates on a 100–240V input, features active PFC, and is cooled by a 120mm fluid dynamic fan that supports zero RPM mode for enhanced efficiency and low noise.
This unit is built to protect your system with safeguards including OCP, OVP, SCP, and OTP, and it offers a comprehensive connectivity suite with a single ATX 24-pin connector, dual EPS (4+4) connectors for the CPU, three PCIe (6+2) connectors, ten SATA power connectors, and four Molex connectors. Its robust build quality makes it suitable for gaming, workstation, and server use cases.
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789934-B21 Specifications
- Product Type
- Power Supply
- Wattage
- 850W
- Use Case
- Gaming / Workstation
- Form Factor
- ATX
- Modularity
- Modular
- 80 PLUS Certification
- Gold
- Rail Configuration
- Single Rail
- Certifications
- 80 PLUS / CE / FCC / UL / ROHS
- Remote Monitoring
- No
- Input Voltage
- 100–240V
- Hot-Swap Capable
- No
- PFC (Power Factor Correction)
- Active PFC
- Fan Size
- 120mm
- Fan Bearing Type
- Fluid Dynamic
- Zero RPM Mode
- Yes
- Efficiency Rating
- 94%
- Protections
- OCP / OVP / SCP / OTP
- ATX 24-Pin Connectors
- 1
- EPS (CPU) 4+4 Pin
- 2
- PCIe (6+2) Connectors
- 3
- SATA Power Connectors
- 10
- Molex Connectors
- 4
- Floppy Connector
- No
- Cable Type
- Sleeved
- RGB Lighting
- No
- MTBF (Mean Time Between Failures)
- 150,000 hours
- Operating Temperature
- 50°C
- Product Name
- 789934-B21 850W Modular ATX Power Supply
- Height
- 5.5 inches
- Width
- 6.3 inches
- Depth
- 3.5 inches
- Weight
- 5.2 lbs
789934-B21 Use Case
High-Availability Telecom Central Office Power Backbone
In a Tier-1 telecom central office, the 789934-B21 HPE 2650W ‑48VDC Platinum PS Kit powers multi-vendor switching and transport shelves with N+1 redundancy. By delivering stable ‑48VDC at platinum-level efficiency, it minimizes energy waste, reduces cooling requirements by up to 20%, and guarantees five-nines availability for voice, data and signaling traffic.
Core Data Center Network Switch Rack Upgrade
When retrofitting high-density top-of-rack and spine switches, IT architects deploy the 789934-B21 HPE 2650W ‑48VDC Platinum PS Kit to consolidate power feeds and enable hot-swap capability. The result is a 50% reduction in rack space devoted to power arrays, up to 96% conversion efficiency, and automated load-sharing that prevents costly downtime during peak traffic.
Remote Edge Computing and IoT Aggregation Sites
For industrial edge computing hubs and remote IoT aggregation points, the 789934-B21 kit provides ruggedized ‑48VDC power with platinum thermal performance in harsh environments. Deployments achieve extended MTBF, simplified plug-and-play installation, and centralized monitoring via HPE iLO—ensuring continuous analytics at the network edge with minimal on-site maintenance.
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table 
| 789934-B21 |  830272-B21 |  J9738A |  588603-B21 |  JG136A | |
|---|---|---|---|---|---|
| Product Type | Power Supply | Power Supply | Power Supply | Power Supply | Power Supply |
| Wattage | 850W | 850W | 750W | 850W | 750W |
| Use Case | Gaming / Workstation | Gaming / Workstation / General Use | Workstation / Gaming | Gaming / Workstation | Gaming |
| Form Factor | ATX | ATX | ATX | ATX | ATX |
| Modularity | Modular | Modular | Modular | Modular | Modular |
| 80 PLUS Certification | Gold | Gold | Gold | Gold | Gold |
| Rail Configuration | Single Rail | Single Rail | Multi Rail | Single Rail | Single Rail |
| Certifications | 80 PLUS / CE / FCC / UL / ROHS | 80 PLUS / CE / FCC / UL / ROHS | 80 PLUS / CE / FCC / UL | 80 PLUS / CE / FCC / UL / ROHS | UL |
| Remote Monitoring | No | No | No | No | No |
| Input Voltage | 100–240V | 100–240V | 100–240V | 100–240V | 100–240V |
| Hot-Swap Capable | No | No | No | No | No |
| PFC (Power Factor Correction) | Active PFC | Active PFC | Active PFC | Active PFC | Active PFC |
| Fan Size | 120mm | 120mm | 135mm | 120mm | 120mm |
| Fan Bearing Type | Fluid Dynamic | Fluid Dynamic | Fluid Dynamic | Fluid Dynamic | Dual Ball |
| Zero RPM Mode | Yes | Yes | Yes | Yes | Yes |
| Efficiency Rating | 94% | 94% | 92% | 90% | 94% |
| Protections | OCP / OVP / SCP / OTP | OCP / OVP / UVP / SCP | OCP / OVP / SCP / OTP | OCP / OVP / UVP / SCP / OTP | OCP / OVP / SCP |
| ATX 24-Pin Connectors | 1 | 1 | 1 | 1 | 1 |
| EPS (CPU) 4+4 Pin | 2 | 2 | 2 | 1 | 1 |
| PCIe (6+2) Connectors | 3 | 3 | 3 | 2 | 2 |
| SATA Power Connectors | 10 | 6 | 4 | 6 | 6 |
| Molex Connectors | 4 | 4 | 2 | 3 | 2 |
| Floppy Connector | No | No | No | No | No |
| Cable Type | Sleeved | Braided | Sleeved | Sleeved | Sleeved |
| RGB Lighting | No | No | No | No | No |
| MTBF (Mean Time Between Failures) | 150,000 hours | 150,000 hours | 150,000 hours | 150,000 hours | 150,000 hours |
| Operating Temperature | 50°C | 50°C | 50°C | 50°C | 50°C |
| Product Name | 789934-B21 850W Modular ATX Power Supply | 830272-B21 High Performance Gold Modular ATX Power Supply | J9738A High Efficiency Modular ATX Power Supply | 588603-B21 High Performance Power Supply | JG136A High Performance Modular Power Supply |
| Height | 5.5 inches | 5.5 inches | 5 inches | 5.5 inches | 5.5 inches |
| Width | 6.3 inches | 6.3 inches | 6 inches | 6.3 inches | 3.4 inches |
| Depth | 3.5 inches | 5.9 inches | 9 inches | 3.4 inches | 6.7 inches |
| Weight | 5.2 lbs | 6.6 lbs | 5 lbs | 7 lbs | 6.5 lbs |
Reviews & Ratings
A
Adeel Hussain
4
Platinum-rated PSU handled continuous loads without voltage drops.
M
Marcus Feldman
4
OEM fit was perfect and performance remained stable under peak demand.
B
Bilal Ahmed
5
Reliable choice for DC-powered enterprise environments.
J
Jonas Richter
4
Consistent output and strong build quality.
Questions & Answers
What are the input and output specifications of the HPE 2650W -48VDC Platinum HP PS Kit (SKU: 789934-B21)?
The HPE 2650W -48VDC Platinum HP PS Kit accepts 200–240 VAC, 50/60 Hz input and delivers a regulated -48 VDC output at up to 2650 W, ensuring high-density power for telecom and networking equipment.
Which HPE systems are compatible with the 789934-B21 2650W -48VDC Platinum power supply?
The 789934-B21 power supply is compatible with HPE Aruba 8320/8400 Switch Series, HPE FlexNetwork 5130/5500 EI, HPE Virtual Connect Modules and select HPE ProLiant and BladeSystem servers designed for -48 VDC input.
How do I install the HPE 2650W -48VDC Platinum HP PS Kit safely?
Power down the chassis, disconnect AC feeds, slide the 2650W -48VDC module into the power bay until it latches, reconnect AC feeds, and verify the status LEDs turn green before restoring system power.
Does the HPE 2650W -48VDC Platinum HP PS Kit support hot-swapping?
Yes. The HPE 2650W -48VDC Platinum HP PS Kit is hot-swap capable, allowing you to replace or add units without shutting down the host system, provided redundant modules remain online.
What efficiency rating does the 789934-B21 power supply achieve?
The HPE 2650W -48VDC Platinum HP PS Kit is 96% efficient at typical loads, exceeding 94% efficiency across a broad load range to reduce energy waste and lower operating costs.
What safety and compliance certifications does this power supply kit have?
This power supply kit is UL/cUL listed, CE marked, FCC Class A compliant, RoHS-6 certified and meets NEBS Level 3 requirements for telecom environments.
What warranty coverage is provided with SKU 789934-B21?
HPE provides a one-year limited warranty on the 2650W -48VDC Platinum HP PS Kit, covering defects in materials and workmanship when installed and operated per HPE guidelines.
Can I monitor the 2650W -48VDC Platinum HP PS Kit remotely?
Yes. The power supply status can be monitored through HPE Integrated Lights-Out (iLO) or HPE OneView via the chassis management controller, displaying health, load and fault alerts.
How can I troubleshoot a fault LED on the 789934-B21 power supply?
If the LED is amber, verify input AC voltage, check upstream breakers, reseat the module, and review iLO logs. Replace the unit if the fault persists after these steps.
What are the physical dimensions and weight of the HPE 2650W -48VDC Platinum HP PS Kit?
The power supply measures 1.7″ H × 5.56″ W × 8.06″ D and weighs approximately 4.5 lbs (2.04 kg), fitting standard HPE chassis power bays.
Is N+1 redundancy supported with multiple 789934-B21 units installed?
Yes. You can install multiple HPE 2650W -48VDC Platinum HP PS Kits in N+1 or N+N configurations to ensure continuous operation during module failure or service.
What operating temperature and humidity ranges does this power supply support?
The 2650W -48VDC Platinum HP PS Kit operates between 0°C to 45°C with 10%–90% relative humidity (non-condensing), complying with standard data center environmental guidelines.
Are replacement parts or service kits available for SKU 789934-B21?
Yes. Genuine HPE spare parts and fan kits are available through HPE Support or authorized partners, ensuring proper maintenance and extended service life.
Where can I purchase an authentic HPE 2650W -48VDC Platinum HP PS Kit?
Purchase through HPE’s certified channel partners, HPE Direct, or authorized distributors to guarantee genuine parts, warranty coverage and technical support.
What safety precautions should I follow when handling this power supply?
Always disconnect AC power, discharge residual voltage, use ESD protection, follow HPE installation guides and ensure the chassis is properly grounded before servicing.
How much acoustic noise does the 789934-B21 power supply generate?
Under typical load and ambient conditions, the HPE 2650W -48VDC Platinum HP PS Kit produces approximately 55 dB(A) of noise, complying with data center noise guidelines.
How does the Platinum efficiency rating benefit my data center?
Platinum efficiency reduces power loss and heat generation, lowers cooling costs, and improves PUE (Power Usage Effectiveness), delivering operational savings and environmental benefits.