Name: AC250NS-00 Dell 250W Power Supply for OptiPlex 390 790 990
Brand: Dell
SKU: AC250NS-00
Price: 138.29 USD
Availability: InStock
Rating: 4.8 (119 reviews)

Product Overview
The Dell 250-Watts Power Supply for OptiPlex 390, 790, and 990 supplies stable and efficient power tailored to these specific desktop models. It fits neatly inside the standard Dell cases and supports essential hardware components by providing consistent energy flow. This power supply acts as a reliable replacement part to keep these desktops running smoothly in office or business environments.

General Information
Brand	Dell
Part Number	AC250NS-00
Product Type	Desktop Power Supply
Condition	Refurbished

Technical Information
Input Voltage	AC 100-240V
Input Frequency	50Hz,60Hz
Output	+12V,+5V,+3.3V,-12V,+5VSB
Max. Output Power	250W
Hot Swappable	No
Redundant Support	No
Cooling Type	Active Fan
Modularity	Non-Modular
rail_design	Single 12V Rail
Number of Fans	1

Compatibility
Form Factor	Proprietary
Compatible For	OptiPlex 390,OptiPlex 790,OptiPlex 990

Connectors
Connector Types	24-pin ATX, 4-pin CPU, SATA, Molex

Physical Characteristics
Weight	5.00

Certifications and Environmental
Compliance Standards	WEEE, RoHS, CE, FCC, cULus

Product Description
This 250-watt power supply is built specifically for Dell OptiPlex 390, 790, and 990 desktop models, providing consistent power to all internal components. It’s commonly used to replace or upgrade existing power units to maintain system stability and performance. Often found in office environments and business desktops, this power supply supports users who need reliable and efficient power delivery for everyday computing tasks. IT professionals and system builders rely on units like this to keep desktops running smoothly. Key Features Compact size fits Dell OptiPlex 390, 790, and 990 cases without modification Delivers efficient power with minimal energy waste thanks to 80 PLUS certification Standardized connectors ensure easy installation and compatibility Durable construction designed for long-term operation Optimized for quiet operation within desktop systems You'll typically find this power supply deployed in office PCs where reliability is critical but space inside the chassis is limited. It helps maintain system uptime and prevents unexpected shutdowns by providing steady power delivery. For business users and IT teams, this power supply plays a key role in keeping legacy Dell desktop systems operational without major upgrades.

Use Cases
The Dell 250W Power Supply is primarily utilized in office and business environments where Dell OptiPlex 390, 790, and 990 desktops are deployed. It caters to IT administrators and support teams managing mid-range desktops that require steady power delivery for daily productivity and stable operation. How It's Used: Replacing aging or faulty power supplies in OptiPlex desktops within SMB offices to reduce downtime. Deploying in remote branch offices to maintain consistent hardware performance for knowledge workers. Supporting desktops used in call centers that demand reliable power for extended operational hours. Integrating into managed IT service environments where standardized replacement parts simplify maintenance. Utilizing in educational computer labs running Dell OptiPlex systems to ensure uninterrupted classroom activities. This power supply supports operational efficiency by providing stable energy delivery tailored for specific desktop models, thus minimizing hardware failure risk. Its compatibility and reliability contribute to scalable IT asset management and consistent performance across enterprise setups.