coolerguys
Coolerguys 3A 100-240v AC to 12v DC Three (3) Fan Power Supply
Bottom line: The Coolerguys 3A 100-240v AC to 12v DC Three Fan Power Supply: Runs three 3-pin 12V fans from one standard US wall outlet; main trade-off: the 3A limit is shared, so three high-draw fans can exceed it.
As an Amazon Associate, SpecPicks earns from qualifying purchases. Full disclosure →
Pros & Cons
Pros
- ✓ Runs three 3-pin 12V fans from one standard US wall outlet
- ✓ 3A of 12V DC output shared across all three fan connectors
- ✓ Switching adapter carries UL, CE, RoHS and FCC ratings
- ✓ Wide 100-240V AC input range
- ✓ Long DC 12V cord lets you place fans away from the outlet
Cons
- ✗ The 3A limit is shared, so three high-draw fans can exceed it
- ✗ Only three fan connectors; bigger fan arrays need a second unit
- ✗ No fan speed control listed; 3-pin fans run at a fixed 12V
- ✗ US plug only; other outlets need an adapter despite 100-240V input
SpecPicks Verdict
SpecPicks scored Coolerguys 3A 100-240v AC to 12v DC Three Fan Power Supply using a rating × review-volume × price-fit model applied to published specs and reviews across the accessories category. coolerguys's accessories lineup sits within the broader category mid-tier; price and specs are the deciding factors over brand loyalty here. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.
Common buyer scenarios for accessories of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.
Key Features
- UNIVERSAL: This 12V 3A power supply is an easy-to-use solution to plug three 3-pin 12v fans (up to 3A worth of fans) off one standard US outlet.
- VERSATILE COMPATIBILITY: Compatible with a wide range of devices and cooling systems requiring a 12v DC power supply, ensuring versatility and convenience.
- STABLE POWER OUTPUT: This AC DC adapter provides stable and consistent power output, preventing fluctuations and ensuring smooth operation of your 3-fan setup.
- SAFETY CERTIFIED: The switching power adapter is UL, CE, ROHS, and FCC rated, providing peace of mind regarding safety and compliance standards.
- LONG WIRING: Features long DC 12V power cord wiring offering flexibility in installation and placement.
Full Specifications
| Brand | coolerguys |
|---|---|
| Color | Black |
| Current | DC |
| Wattage | 3 watts |
| Amperage | 3 A |
| UNIVERSAL | This 12V 3A power supply is an easy-to-use solution to plug three 3-pin 12v fans (up to 3A worth of fans) off one standard US outlet. |
| Power Plug | Type A - 2 pin (North American) |
| Unit Count | 3 Count |
| LONG WIRING | Features long DC 12V power cord wiring offering flexibility in installation and placement. |
| Model Number | 840556074311 |
| Power Source | Corded Electric |
| Input Voltage | 240 volts |
| Mounting Type | Wall Mount |
| Built-In Media | Power Adapter |
| Connector Type | Barrel Connector |
| Output Current | 3 A |
| Output Voltage | 12 volts |
| Frequency Range | 50 hz - 60 hzard |
| Mfr Part Number | 840556074311 |
| Number of Items | 1 |
Ready to buy?
Coolerguys 3A 100-240v AC to 12v DC Three (3) Fan Power Supply is listed on Amazon. Price, availability, shipping and returns are set by Amazon and its sellers — check the listing for current terms. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.
Related Accessories
More guides & deep dives from the SpecPicks archive
Browse all articles & guides →- Best 1440p Gaming GPUs in 2026
- How to Build a Windows 98 Retro PC in 2026
- The Complete Voodoo5 5500 AGP Driver Guide (2026 Edition)
- RTX 4070 Super vs RX 7800 XT — Which to Buy in 2026
- Emulation Hardware in 2026: FPGA, Software, and Cart-Reader Ecosystems
- Best Budget Gaming PC Build 2026 — ~$1,000 ($800 on Sale)
- Best Retro Handhelds in 2026 — From $35 to $500
More reviews from the SpecPicks archive
Browse all reviews →- Intel Eyed as TSMC Backup by Google and Nvidia for AI Chips
- Prime Intellect Raises $130M to Help Enterprises Build Their Own AI Agents
- Installing 3dfx Voodoo Glide Drivers on Windows 98 in 2026
- Intel Plans Two 22-Core Nova Lake-S SKUs With Game-Boosting Cache
- Quantization on a 12GB GPU: q4 vs q5 vs q8 Tok/s and Quality on the RTX 3060
- Build a Raspberry Pi 4 Pi-hole + Unbound Ad-Blocker in 2026
- Best Retro Gaming Storage Adapters for Win98 and DOS PCs in 2026
- Imaging a vintage IDE hard drive with a USB adapter in 2026
- Air vs AIO for the Ryzen 7 5800X: Noctua NH-U12S vs CoolerMaster ML240L
- How to run Llama 3.1 8B on NVIDIA GeForce RTX 5080
- gpt-oss 20B vs Phi-4 14B on a 12 GB GPU: Which One Actually Fits?
- Forza Horizon 6 on Steam Deck: How Well Does It Run?
- Gemma-4-Harmonia-31B Uncensored on RTX 3060 12GB: Quantization, VRAM, and tok/s
- Best SATA SSD for a PS4 Slim and Emulation Box in 2026
- Best Sim Racing Wheel Setup 2026: G920 vs HORI vs TH8A
- Best Storage Upgrades for Gaming and Retro PCs in 2026
- GeForce FX 5900 Ultra Period-Correct WinXP Build Guide: Driver Hunt, Half-Life 2 Mixed-Mode, and Doom 3…
- Best SSD for a Local LLM Model Library in 2026: Capacity vs Load Speed
- Sub-$300 4K Mini-LED Gaming Monitors Hit the Mainstream
- LM Studio on an RTX 3060 12GB: Local-LLM Setup and tok/s in 2026
- Best SATA SSD for Gaming and Console Upgrades in 2026
- Win98 SE on 1GB+ RAM: The vcache Fix Every Retro Builder Needs
- Crucial BX500 vs Samsung 870 EVO: Best Budget SATA SSD for Upgrades
- Ideogram 4.0 Open Weights: Native 2K Image Gen on a 12GB GPU
Earliest SpecPicks reviews
Browse full archive →- Best GPU for Llama 3.1 8B (2026)
- Best GPU for Qwen 3 14B (2026)
- Best GPU for Qwen 3 32B (2026)
- Best GPU for Llama 3.1 70B (2026)
- Best GPU for DeepSeek-R1 32B (2026)
- Best GPU for Llama 3.1 405B (2026)
- How to run Llama 3.1 8B on NVIDIA GeForce RTX 5090
- How to run Qwen 3 14B on NVIDIA GeForce RTX 5090
- How to run Qwen 3 32B on NVIDIA GeForce RTX 5090
- How to run Llama 3.1 70B on NVIDIA GeForce RTX 5090
- How to run DeepSeek-R1 32B on NVIDIA GeForce RTX 5090
- How to run Llama 3.1 8B on NVIDIA GeForce RTX 4090