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277VAC PSU performed reliably in our data center.
798101-B21
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HPE 2650W 277VAC Ht Plg PS Kit
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798101-B21
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- HPE 2650W 277VAC Ht Plg PS Kit
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798101-B21 Overview
798101-B21 is an 850W ATX power supply offering a fully modular design with an 80 PLUS Gold certification. It supports an input voltage of 100–240V and features Active PFC, a 120mm fluid dynamic fan with Zero RPM mode to keep noise levels low while maintaining optimal cooling. The unit is built with high build quality incorporating multiple protection mechanisms including OCP, OVP, SCP, and OTP, ensuring reliable performance under intensive gaming and workstation conditions.
This model includes an ATX 24-pin connector, an EPS 4+4 pin connector, dual PCIe (6+2) connectors for graphics cards, six SATA power connectors, and three Molex connectors, all equipped with sleeved cables for improved cable management and durability. Its efficiency rating of 92% and a projected MTBF of 150,000 hours make it a popular choice for high-performance gaming rigs and professional workstations where stable and efficient power delivery is critical.
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798101-B21 Specifications
- Product Type
- Power Supply
- Wattage
- 850W
- Use Case
- Gaming / Workstation
- Form Factor
- ATX
- Modularity
- Modular
- 80 PLUS Certification
- Gold
- Rail Configuration
- Multi Rail
- Certifications
- 80 PLUS / CE / FCC / UL / CB / TUV / 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
- 92%
- Protections
- OCP / OVP / SCP / OTP
- ATX 24-Pin Connectors
- 1
- EPS (CPU) 4+4 Pin
- 1
- PCIe (6+2) Connectors
- 2
- SATA Power Connectors
- 6
- Molex Connectors
- 3
- Floppy Connector
- No
- Cable Type
- Sleeved
- RGB Lighting
- No
- MTBF (Mean Time Between Failures)
- 150,000 hours
- Operating Temperature
- 50°C
- Product Name
- 798101-B21 High Performance Modular ATX Power Supply
- Height
- 5.5 inches
- Width
- 8.5 inches
- Depth
- 7.0 inches
- Weight
- 4.8 lbs
798101-B21 Use Case
Data Center Power Redundancy for Mission-Critical HPE Servers
In large-scale data centers running HPE ProLiant Gen10 servers, the 798101-B21-HPE 2650W 277VAC Hot-Plug Power Supply Kit provides N+1 redundancy to eliminate single points of failure. By deploying dual hot-swap PSUs, IT operations guarantee continuous uptime during maintenance or PSU failure, reducing unplanned downtime by up to 99.999% and cutting service-level agreement (SLA) breach costs.
High-Density Compute Racks in Financial Trading Platforms
Financial firms leveraging HPE’s in-rack compute clusters use the 798101-B21-HPE 2650W 277VAC Hot-Plug Power Supply Kit to support peak trading workloads with stable, high-efficiency power. This kit’s 277VAC input optimizes power distribution in high-density PDUs, enabling a 20% improvement in power utilization effectiveness (PUE) and ensuring low-latency transaction processing during market surges.
Edge Computing Reliability for Remote Telecom Base Stations
Telecommunications providers deploying HPE edge servers in remote cell sites rely on the 798101-B21-HPE 2650W 277VAC Hot-Plug Power Supply Kit for rugged, high-voltage operation. With hot-swap capability and 277VAC compatibility, field technicians can replace modules without shutting down services, achieving 30% faster maintenance cycles and maintaining 24/7 network availability.
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table 
| 798101-B21 |  798100-B21 |  865428-B21 |  748287-B21 |  JL085A | |
|---|---|---|---|---|---|
| Product Type | Power Supply | Power Supply | Power Supply | Power Supply | Power Supply |
| Wattage | 850W | 1000W | 850W | 850W | 850W |
| Use Case | Gaming / Workstation | Gaming / Workstation | Gaming | Gaming / Workstation / Server | Gaming / Workstation / General Use |
| Form Factor | ATX | ATX | ATX | ATX | ATX |
| Modularity | Modular | Modular | Modular | Modular | Modular |
| 80 PLUS Certification | Gold | Platinum | Gold | Gold | Gold |
| Rail Configuration | Multi Rail | Single Rail | Single Rail | Single Rail | Single Rail |
| Certifications | 80 PLUS / CE / FCC / UL / CB / TUV / RoHS | 80 PLUS / CE / FCC / UL / ROHS | 80 PLUS / CE / FCC / UL / CB / TUV / RoHS | 80 PLUS / CE / FCC / UL / ROHS | 80 PLUS / CE / FCC / UL / ROHS |
| Remote Monitoring | No | N/A | No | N/A | 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 | 135mm | 120mm | 135mm | 120mm |
| Fan Bearing Type | Fluid Dynamic | Fluid Dynamic | Fluid Dynamic | Fluid Dynamic | Fluid Dynamic |
| Zero RPM Mode | Yes | Yes | Yes | Yes | Yes |
| Efficiency Rating | 92% | 94% | 92% | 94% | 92% |
| Protections | OCP / OVP / SCP / OTP | OCP, OVP, UVP, SCP, OTP, OPP | OCP / OVP / SCP | OCP, OVP, UVP, SCP, OTP, Surge | OCP / OVP / UVP / SCP / OTP |
| ATX 24-Pin Connectors | 1 | 1 | 1 | 1 | 1 |
| EPS (CPU) 4+4 Pin | 1 | 2 | 1 | 2 | 2 |
| PCIe (6+2) Connectors | 2 | 4 | 2 | 3 | 4 |
| SATA Power Connectors | 6 | 8 | 4 | 8 | 8 |
| Molex Connectors | 3 | 4 | 2 | 4 | 4 |
| Floppy Connector | No | No | No | No | No |
| Cable Type | Sleeved | Sleeved | 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 | 798101-B21 High Performance Modular ATX Power Supply | 798100-B21 High Performance Modular Power Supply | 865428-B21 High Performance Modular ATX Power Supply | 748287-B21 High-Performance Modular ATX Power Supply | JL085A 850W High-Performance Modular ATX Power Supply |
| Height | 5.5 inches | 5.9 in | 5 inches | 5.5 inches | 5 inches |
| Width | 8.5 inches | 3.39 in | 5.9 inches | 6.3 inches | 6 inches |
| Depth | 7.0 inches | 5.51 in | 11 inches | 10.2 inches | 7 inches |
| Weight | 4.8 lbs | 7.5 lbs | 6.2 lbs | 5.8 lbs | 4 lbs |
Reviews & Ratings
F
Fahad Mirza
4
Hot-plug replacement was seamless.
J
James Thornton
5
OEM unit delivered consistent power.
K
Kashif Javed
5
Strong option for high-voltage setups.
S
Sven Pettersson
4
Very dependable.
Questions & Answers
What is the HPE 2650W 277VAC Hot Plug Power Supply Kit (SKU: 798101-B21)?
The HPE 2650W 277VAC Hot Plug Power Supply Kit (SKU: 798101-B21) is a high-efficiency, hot-swappable AC power module designed to deliver up to 2650 watts of redundant power to compatible HPE rack servers, supporting a 200–277 VAC input range.
Which HPE servers are compatible with the 798101-B21 power supply kit?
The 798101-B21 power supply kit is compatible with HPE ProLiant Gen10 and Gen11 rack-mount servers including DL360, DL380, DL325, DL385 and their variants that accept 2650W, 277VAC hot-plug modules.
What are the input power specifications for SKU: 798101-B21?
SKU 798101-B21 supports a single-phase input of 200–277 VAC at 50/60 Hz and delivers up to 2650 watts of continuous output power for demanding data-center workloads.
Does the HPE 2650W 277VAC Power Supply support hot-swap capability?
Yes, the HPE 2650W 277VAC Power Supply Kit features hot-plug capability, allowing you to replace or add power modules without shutting down or interrupting server operation.
How do I install the HPE 2650W 277VAC Hot Plug Power Supply Kit?
To install, power down the server only if no redundancy is available, slide the module into an empty PSU bay until it clicks, secure the latch, then reconnect the AC input cable and power on the server.
Can the 2650W power supply be used in a redundant configuration?
Yes, you can deploy two or more 2650W modules in parallel for N+1 or N+N redundancy to ensure continuous operation in case of a single-module failure.
Is the HPE 2650W 277VAC Power Supply KIT energy-efficient?
The 798101-B21 kit is designed to meet high efficiency standards, including 80 PLUS Platinum levels, reducing energy waste and lowering overall data-center power costs.
What safety and regulatory certifications does SKU: 798101-B21 hold?
The 798101-B21 kit is certified for UL, CE, FCC Class A, CB Scheme and RoHS compliance, ensuring global safety, electromagnetic compatibility and environmental standards are met.
What is the warranty period for the HPE 2650W 277VAC Hot Plug Power Supply Kit?
HPE provides a three-year limited hardware warranty on SKU 798101-B21, covering defects in materials and workmanship under normal use and service.
How do I troubleshoot common issues with the HPE 2650W 277VAC Power Supply?
Verify proper AC input voltage, ensure the module is fully seated, check LED status indicators, review server logs for PSU fault codes, and consult the HPE Service Guide for detailed diagnostics.
Are status LEDs available on the HPE 2650W 277VAC Power Supply?
Yes, the module includes multi-color LEDs indicating power presence, health status and fault conditions, providing quick visual feedback for monitoring and troubleshooting.
What are the dimensions and weight of the 798101-B21 power supply?
The HPE 2650W 277VAC power supply measures 41.3 mm (H) × 71.4 mm (W) × 324 mm (D) and weighs approximately 2.3 kg (5.1 lb), fitting standard 2 U server PSU bays.
Can I use this power supply in standard 19-inch server racks?
Yes, the 798101-B21 power supply is designed for standard 19-inch rack-mount servers and fits all HPE ProLiant chassis that support 2650W AC modules.
Where can I purchase genuine HPE 2650W 277VAC Hot Plug Power Supply Kit?
You can purchase SKU 798101-B21 through the HPE Store, authorized HPE channel partners, or reputable online resellers offering genuine HPE parts with warranty coverage.
Is SKU 798101-B21 backward compatible with older HPE server generations?
SKU 798101-B21 is primarily approved for HPE ProLiant Gen10 and Gen11 servers; compatibility with earlier generations may vary, so verify your server’s QuickSpecs before ordering.
How do I replace an existing power supply with SKU 798101-B21?
Ensure redundant PSUs are online, remove the faulty module by unlocking the latch, slide out the old PSU, insert the 798101-B21 unit until it engages, then reconnect AC power.
Does the HPE 2650W 277VAC Hot Plug Power Supply Kit include installation accessories?
Yes, the kit includes the power supply module, an AC input cable, mounting latch and quick-start installation guide for seamless integration into your HPE server chassis.