Quick Summary
The Eaton Serie 3S 3S550B is an off-line UPS with 550VA / 330W power, designed to provide battery backup during power outages and unsafe voltage fluctuations while also protecting connected equipment from damaging surges and spikes. It has a quiet fan-less design and 6 UK BS outlets.
This model includes battery backup and surge protection for desktop computers, wireless networks, internet routers, printers, gaming consoles and other electronics. It also has a USB port with HID compliance for automatic integration with most common operating systems.
Who It Is Best For
This UPS is for buyers who want backup power and surge protection for home or small-office electronics that use UK BS plug outlets. It suits anyone who wants to keep selected devices running briefly during a power cut and keep other connected equipment protected from surges.
Key Details
| Detail | Verified information and buyer relevance |
|---|---|
| Model | 3S550B, helping identify the exact UPS variant. |
| Power rating | 550VA / 330W, which shows the stated load capacity. |
| Runtime | Standard runtime of 10 minutes, useful when planning short backup needs. |
| Outlets | 6 total BS outlets with 3 battery backup and 3 surge only. |
| USB interface | USB port with HID compliance for automatic integration with most common operating systems. |
| Design | Quiet fan-less design. |
| Included items | UPS, 2 IEC output cords (1.5m), quick start guide and safety instructions. |
| Colour | Black and white. |
Why Buyers Choose It
- 550VA / 330W gives a clear stated power limit for selecting suitable connected devices.
- 3 battery backup outlets and 3 surge-only outlets let you separate backup-critical items from surge-protected equipment.
- The USB HID interface supports automatic integration with most common operating systems.
- The fan-less design is a useful detail for buyers who prefer quieter operation.
What To Know Before You Buy
Check the total load of the devices you plan to connect and compare it with the stated 550VA / 330W rating. The UPS has 6 UK BS outlets, so confirm your plugs and setup match that outlet type before ordering.
Pros: It combines battery backup, surge protection and a USB HID interface in one UPS with 6 UK BS outlets.
Cons: The stated standard runtime is 10 minutes, so it is aimed at short backup periods rather than long running time.
Common Buyer Questions
How many outlets does it have?
It has 6 total BS outlets, with 3 for battery backup and 3 surge only.
What is the power rating?
The UPS is rated at 550VA / 330W.
Does it include cables?
Yes. The delivery contents include 2 IEC output cords measuring 1.5m.
What devices is it described for?
It is described for desktop computers, wireless networks, internet routers, printers, gaming consoles and other electronics.
Final Buying View
The Eaton Serie 3S 3S550B is a compact UPS for users who need brief backup power and surge protection for UK-plugged electronics. Review the 550VA / 330W rating, outlet split and included cables before choosing it for your setup.
