# Power Supply Dell 255W Slim Form Factor FN3MN — 255W AC adapter for Dell slim desktops

**URL:** https://aio.lv/en/product--dell-fn3mn--604821
**Data updated:** 2026-01-13 15:25 (EET)
**Category:** Other Repair Parts
**Manufacturer:** Dell
**Manufacturer code:** FN3MN
**EAN:** 5712505832301
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 99.99 €
**Prices and availability valid until:** 2026-07-12 23:59
**Price without VAT (21%):** 82.64 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--dell-fn3mn--604821

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 30.06.2026 | free |
| Pickup points | 03.07.2026 | 1.99 EUR |
| Courier delivery to door | 03.07.2026 | 4.99 EUR |

## Summary description

Dell Power Supply 255W Slim Form Factor FN3MN is a compact 255-watt AC power unit designed for slim Dell desktops. It provides stable power delivery for system components, supports standard slim-form connectors, and fits space-constrained chassis. Suitable for repair or upgrade of compatible Dell systems, it ensures reliable operation and reduces downtime.

## Long description

The Dell 255W Slim Form Factor power supply is a compact AC adapter designed for slim Dell desktop systems. It delivers up to 255 watts of continuous power to system components, supports the slim-form connector layout used in compatible Dell chassis, and is intended for replacement or upgrade in space-constrained desktop units. The unit is engineered to provide stable voltage and current to the motherboard, storage devices and other internal components to maintain system reliability during typical office and home workloads.
Advantages
This slim 255W adapter occupies minimal internal space while providing sufficient power for typical slim desktop configurations. Its design matches standard slim-form connector placements and mounting points, making installation straightforward in compatible systems. The power supply includes overcurrent and short-circuit protection features to help prevent damage to connected components and to support continuous operation under variable load conditions. The compact form and focused output power help reduce excess heat generation compared with larger, higher-wattage units.
Suitable for
Replacement of a failed or degraded power supply in compatible Dell slim desktops
Upgrading or repairing small-form-factor Dell systems that require a 255W AC adapter
Service and maintenance environments where quick swap of slim power supplies is needed
Key specifications
Output power: 255 watts continuous
Form factor: slim desktop power supply designed for space-constrained chassis
Connector type: slim-form internal power connector compatible with supported Dell motherboards
Input: AC mains power (standard voltage range for desktop adapters)
Protection features: overcurrent and short-circuit protection
Intended use: internal AC adapter for Dell slim desktop systems
How to use
Power down the desktop, disconnect the mains cable and open the chassis according to the manufacturer's service instructions. Remove the failed power supply by disconnecting the internal power connector(s) from the motherboard and any drive or peripheral connectors, then unmount the unit from its bracket or retaining points. Install the replacement 255W slim power supply by securing it in the chassis, reconnecting all internal connectors to their original sockets, and routing cables to avoid interference with fans or other components. Reattach the chassis cover, connect the mains cable, and perform a power-on test to verify normal operation and system stability.
Usage recommendations
Use this power supply only in systems explicitly listed as compatible by the system manufacturer. Ensure that the system's thermal and power requirements do not exceed the adapter's 255W rating. If adding additional components that increase power draw, verify total system consumption before relying on this unit. For safety, follow electrostatic discharge precautions and the manufacturer's service procedures when installing or replacing the power supply.

## FAQ

### How much does the Dell 255W Slim Form Factor Power Supply FN3MN cost, and is it available for purchase?

The price is 99.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 18 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 30.06.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Cash payment, Bank transfer, Bank cards on-line, Apple Pay, Google Pay. All transactions are 100% secure and encrypted.

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All Dell products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized Dell service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

## Image

https://aio.lv/img/cache/product/604821/66003000_large.webp