Replacement 240W L240NM-00 Power Supply for Dell Optiplex & Inspiron

Our review finds the Replacement 240W L240NM-00 power supply is aimed at owners of small form factor Dell desktops who need a straightforward, compatible replacement power source. In this review the unit's single biggest reason to buy is clear: it provides the same 240W maximum output and the specific P1 8-pin and P2 4-pin SFF connectors used by many Optiplex 3040/5040/7040 and Inspiron 3650/3656 systems, making it a practical swap when the original supply fails. The build is described as high quality and each item is tested before shipping, so it suits users who want a drop-in replacement without hunting for model-matching OEM numbers.

Key Features

• 240W maximum output: Provides the same rated power as the original unit so systems designed for 240W can run without underpowered behavior.
• P1 8-pin and P2 4-pin connectors: The included 8-pin and 4-pin SFF connectors match the power connections used in compatible Dell SFF motherboards for a direct fit.
• Compatibility with multiple part numbers: Lists many compatible model and part numbers so users can confirm fit across Optiplex and Inspiron variants.
• Tested before shipping: Each item is checked and reported in good condition prior to dispatch, reducing the chance of receiving a dead unit.
• Designed for small form factor PCs: The compact SFF design fits the constrained spaces of Dell SFF chassis where a standard ATX supply would not.

Who It's For

This power supply is best for DIY repairers or IT technicians maintaining Dell Optiplex 3040, 5040, 7040 SFF systems or Inspiron 3650 and 3656 desktops that require a 240W SFF unit with 8-pin and 4-pin connectors. It is also suitable for small business repair shops replacing failed OEM supplies with a tested aftermarket alternative.

Users who should look elsewhere include builders who need modular or higher-wattage supplies for upgrades, and owners of full-size tower PCs that do not use SFF connectors. Also check exact part numbers and physical connector orientation before ordering if the desktop has uncommon custom wiring.

Pros & Cons

Pros

• Provides the required 240W capacity for supported Dell SFF desktops, avoiding power bottlenecks.
• Direct compatibility with P1 8-pin and P2 4-pin SFF power connectors makes installation straightforward for matching systems.
• Product arrives tested, which helps reduce DOA risk and speeds return-to-service time.
• Wide list of compatible part and model numbers simplifies cross-referencing for replacements.

Cons

• Fit receives mixed feedback from customers, so some systems may require verification of connector placement or a slightly different revision.
• Not suitable for upgrades that need higher wattage or standard ATX form factors.

Specifications

Maximum Output Power	240W
Input Voltage	100-127V ~ / 7.0A
Connector P1	8-Pin SFF Power
Connector P2	4-Pin SFF Power
Compatible Models	Optiplex 3040/5040/7040 SFF, Inspiron 3650/3656
Compatible Part Numbers	Includes THRJK, 4GTN5, H62JR, 3RK5T and others listed

Our Verdict

The Replacement 240W L240NM-00 is a practical, cost-effective option for anyone needing a like-for-like power supply for Dell small form factor desktops. It reproduces the key electrical and connector characteristics of the OEM unit, arrives tested, and works well for repairs and routine maintenance. Confirm exact part or model identifiers before purchase to avoid fit issues, but for supported Optiplex and Inspiron systems this is a sensible replacement that offers reliable value.

Frequently Asked Questions

Will this power supply fit my Optiplex 5040 SFF?
It is listed as compatible with Optiplex 5040 SFF models and uses the standard P1 8-pin and P2 4-pin SFF connectors, but verify the part number or physical connector orientation in your chassis first.

What voltage input does it accept?
The unit accepts 100-127V AC input at up to 7.0A according to the supplied specifications.

Is the unit tested before shipping?
Yes, each item is tested and reported in good condition before shipping to reduce the chance of receiving a nonworking unit.