280W Power Supply for OptiPlex GX520 GX620 DT 745 755

280W internal desktop power supply for compatible OptiPlex and Dimension desktop systems using the matching DT-style chassis power supply layout. This replacement PSU is designed for systems requiring a 280W unit with 24-pin ATX main power, 4-pin CPU power, SATA power leads, Molex power, floppy/CD power, and the same physical size, rear AC plug position, voltage selector, mounting points, and connector layout.

What’s Included

• Included Item: 1x 280W internal desktop power supply

Technical Specifications

• Primary Part Number: A280P-00
• Part Type: Internal desktop power supply
• Maximum Output Power: 280W
• Form Factor: Desktop chassis PSU
• Dimensions: 125mm x 135mm x 100mm
• AC Input Voltage: 100-240V~
• AC Input Current: 4.2A
• Frequency: 50-60Hz
• DC Output +3.3V: 10A
• DC Output +5V: 15A
• DC Output +12V: 16A
• DC Output -12V: 0.5A
• DC Output +5Vsb: 2A
• Condition: Grade A, cleaned and fully tested
• Installation Type: Internal screw-mounted desktop PSU
• Application Type: Desktop power supply replacement for compatible DT-style systems

Connector & Cable Layout

• P1 Main Connector: 24-pin ATX main power connector
• P2 CPU Connector: 4-pin ATX +12V power connector
• P3 Peripheral Connector: 4-pin Molex connector
• P4 Floppy / CD Connector: 4-pin floppy / CD drive power connector
• P5 SATA Power Connector: SATA power cable
• P6 SATA Power Connector: SATA power cable
• AC Power Input: Standard C13 AC power cable required, sold separately

Interchangeable / Replacement Part Numbers

A280P-00, AA24120L, D280P-00, D5539, DPS-280DB A, DPS-280DBA, F5114, H280P-00, H280P-01, HP-Q2828F3P LF, HP-Q2828F3PLF, L280P-00, L280P-01, MH596, NH429, P9550, PS-5281-3DF, PS-5281-3DFS, PS-5281-5DF-LF, RT490, U9087, X9072

Required Power Cable Sold Separately

This power supply requires a standard C13 AC power cable, sold separately: M2PNC 3 ft C13 Power Cable

✅ Confirmed Compatibility

Please note that the following list is not exhaustive. Compatibility depends on your system’s specific chassis style, original power supply part number, connector layout, wattage, rear AC plug location, mounting points, and cable routing. It’s essential to verify compatibility with your desktop model and original power supply before installation.

✔ OptiPlex Desktop Models: OptiPlex 210L, OptiPlex 320, OptiPlex 330, OptiPlex 360, OptiPlex 740, OptiPlex 745, OptiPlex 755
✔ OptiPlex GX Desktop Models: OptiPlex GX280, OptiPlex GX520, OptiPlex GX620
✔ Dimension Desktop Models: Dimension C521, Dimension 3100C
✔ Compatible DT-Style Configurations: Compatible desktop chassis configurations originally equipped with a matching 280W PSU using the listed interchangeable part numbers and connector layout

☑️ Key Features

☑️ 280W replacement power supply for compatible desktop systems
☑️ Grade A, cleaned, and fully tested
☑️ Includes 24-pin ATX main power connector
☑️ Includes 4-pin ATX +12V CPU power connector
☑️ Includes SATA, Molex, and floppy/CD power connectors for supported internal devices
☑️ Supports 100-240V AC input for broad regional compatibility
☑️ DT-style PSU dimensions for matching desktop chassis installations
☑️ Useful replacement for failed, noisy, intermittent, or non-working power supplies
☑️ Interchangeable with A280P-00, D280P-00, H280P-00, L280P-00, DPS-280DB A, and other listed part numbers
☑️ Includes warranty

⚙️ Fit Notes

• Match your original power supply part number whenever possible
• Confirm your original PSU is a 280W unit with the same connector layout
• Confirm your system uses a 24-pin ATX main power connector and 4-pin ATX +12V CPU power connector
• Confirm your chassis is the compatible desktop / DT-style configuration, not a mini tower, small form factor, ultra-small form factor, or micro chassis
• Compare the physical dimensions, rear AC plug location, voltage selector position, mounting screw points, fan orientation, and cable routing before ordering
• Verify the number and position of SATA, Molex, and floppy/CD power connectors needed for your drives and internal devices
• This power supply requires a standard C13 AC power cable, sold separately
• This unit does not include an AC power cord unless shown
• Always disconnect the AC power cable and allow the system to fully discharge before replacing a power supply
• Do not install in systems requiring higher wattage, different chassis-specific dimensions, proprietary connector layouts, or different mounting style