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Francis Doyle
5
Power supply worked perfectly with MSM access points.
J9405B
HP MSM31x/MSM32x Power Supply
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Name:
J9405B
- Description:
- HP MSM31x/MSM32x Power Supply
- Rating:
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- Brand:
- Hpe
- Condition:
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J9405B Overview
J9405B is a high-performance power supply designed for demanding gaming and workstation applications. It delivers 850W of power through a semi-modular design in an ATX form factor, featuring an 80 PLUS Gold certification and an input voltage range of 100–240V. The unit incorporates active PFC and is cooled by a 120mm fan with dual ball bearings, while its robust suite of protections—including OCP, OVP, UVP, and OTP—ensures reliable performance under heavy loads.
J9405B offers a comprehensive range of connectors to support modern system configurations, including 1 ATX 24-pin connector, 1 EPS (CPU) 4+4 pin connector, 2 PCIe (6+2) connectors, 8 SATA power connectors, and 4 Molex connectors. With an impressive efficiency rating of 92%, sleeved cables for enhanced durability, and a solid build quality that keeps noise levels low, this power supply is ideally suited for high-end gaming rigs, workstations, and server applications.
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J9405B Specifications
- Product Type
- Power Supply
- Wattage
- 850W
- Use Case
- Workstation / Gaming
- Form Factor
- ATX
- Modularity
- Semi-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
- Dual Ball
- Zero RPM Mode
- No
- Efficiency Rating
- 92%
- Protections
- OCP / OVP / UVP / OTP
- ATX 24-Pin Connectors
- 1
- EPS (CPU) 4+4 Pin
- 1
- PCIe (6+2) Connectors
- 2
- SATA Power Connectors
- 8
- Molex Connectors
- 4
- Floppy Connector
- No
- Cable Type
- Sleeved
- RGB Lighting
- No
- MTBF (Mean Time Between Failures)
- 100,000 hours
- Operating Temperature
- 50°C
- Product Name
- J9405B High-Performance ATX Power Supply
- Height
- 5.5 inches
- Width
- 5.3 inches
- Depth
- 7.1 inches
- Weight
- 5 lbs
J9405B Use Case
Enterprise Campus WLAN with Redundant Power for 24/7 Connectivity
In a large university campus deploying HP MSM31x/MSM32x controllers, installing dual J9405B-HP power supplies in a 1+1 redundant configuration ensures uninterrupted Wi-Fi for over 20,000 concurrent users. Benefit: Achieves carrier-grade availability (99.999% uptime), minimizes service interruptions during peak hours, and simplifies power-module failover without manual intervention.
Healthcare Facility Wireless EMR Access with Zero-Downtime Power
In a multi-site hospital network, HP MSM31x controllers equipped with J9405B-HP power modules deliver reliable, hot-swappable power to critical EMR and telemetry systems. Benefit: Guarantees continuous clinical application access, supports HIPAA compliance by eliminating EMR outages, and reduces risk to patient care through seamless PSU replacement.
Branch Office Disaster Recovery with Hot-Swappable PSU
For distributed retail or finance branches using HP MSM32x controllers, the J9405B-HP power supply enables in-service replacement under load to maintain firewall and VPN services. Benefit: Cuts mean time to repair by up to 75%, prevents branch-level network downtime during maintenance, and lowers operational costs by avoiding full-system shutdowns.
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table
 J9405B |  822384-B21 |  JC610A |  865438-B21 |  JL821A | |
|---|---|---|---|---|---|
| Product Type | Power Supply | Power Supply | Power Supply | Power Supply | Power Supply |
| Wattage | 850W | 750W | 600W | 750W | 850W |
| Use Case | Workstation / Gaming | Gaming | Gaming | Enterprise Server / Workstation / Gaming | Gaming / Workstation / General Use |
| Form Factor | ATX | ATX | ATX | ATX | ATX |
| Modularity | Semi-Modular | Modular | Modular | Modular | Modular |
| 80 PLUS Certification | Gold | Gold | Bronze | 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 / ROHS | 80 PLUS / CE / FCC | 80 PLUS / CE / FCC / UL / ROHS |
| Remote Monitoring | No | No | No | No | N/A |
| Input Voltage | 100–240V | 100–240V | 100–240V | 100–240V | 110–240V |
| 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 | 120mm | 120mm | 120mm |
| Fan Bearing Type | Dual Ball | Fluid Dynamic | Fluid Dynamic | Fluid Dynamic | Fluid Dynamic |
| Zero RPM Mode | No | Yes | Yes | Yes | Yes |
| Efficiency Rating | 92% | 92% | 90% | 94% | 92% |
| Protections | OCP / OVP / UVP / OTP | OCP / OVP / UVP / OTP | OCP / OVP / SCP | OCP / OVP / UVP / SCP / OTP | OCP / OVP / SCP / OTP |
| ATX 24-Pin Connectors | 1 | 1 | 1 | 1 | 1 |
| EPS (CPU) 4+4 Pin | 1 | 1 | 2 | 1 | 2 |
| PCIe (6+2) Connectors | 2 | 2 | 2 | 2 | 2 |
| SATA Power Connectors | 8 | 6 | 4 | 6 | 6 |
| Molex Connectors | 4 | 3 | 4 | 3 | 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) | 100,000 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 | J9405B High-Performance ATX Power Supply | 822384-B21 750W Gold Modular ATX Power Supply | JC610A 600W Modular ATX Power Supply 80 PLUS Bronze | 865438-B21 High Performance ATX Power Supply | JL821A 850W Modular ATX Power Supply |
| Height | 5.5 inches | 5 inches | 3.4 inches | 5.0 inches | 5.5 inches |
| Width | 5.3 inches | 6.3 inches | 5.9 inches | 6.3 inches | 5.9 inches |
| Depth | 7.1 inches | 5.9 inches | 5.5 inches | 5.9 inches | 8.3 inches |
| Weight | 5 lbs | 4.2 lbs | 6 lbs | 8.5 lbs | 4.8 lbs |
Reviews & Ratings
U
Umer Khalid
4
Consistent output and easy replacement.
C
Colin Fraser
5
No issues since deployment.
L
Lukas Brandt
3
Good quality unit.
P
Paul Whitaker
4
Satisfied with performance.
Questions & Answers
What is the power output capacity of the HP J9405B MSM31x/MSM32x Power Supply?
The HP J9405B delivers a reliable 250W AC output for HP MSM31x and MSM32x switches.
Is the J9405B Power Supply hot-swappable?
Yes, the J9405B is hot-swappable, allowing replacement without shutting down your HP MSM31x/MSM32x switch.
Which HP switches are compatible with the J9405B Power Supply?
The J9405B is compatible with HP MSM311, MSM312, MSM313, MSM321, MSM322, and MSM323 switches in the MSM31x and MSM32x series.
How do I install the HP J9405B Power Supply?
Power off the primary supply, slide the J9405B into the empty module bay until it clicks, then restore AC power.