The Eaton 3S Mini UPS is a compact uninterruptible power supply designed to save us when the electrical network fails. The manufacturer has had the courtesy of sending one of these units to our newsroom, so we are going to share with you the experience of using the small UPS . We encourage you to discover the usefulness of the Eaton product through the review . An ideal accessory to keep critical system devices always active, such as a FRITZ!Box 4060 router .
Presentation of the Eaton 3S Mini UPS
The small 3S Mini is a practical UPS from the Eaton brand , dedicated to producing a wide range of products and services. The company offers everything from fuel-efficient systems to power chain management tools and components that safely guide commercial aircraft. It may be surprising that managing at such levels, the firm has in its catalog a device, a priori, so simple. But Eaton distinguishes itself by finding new ways to increase the value of the products and services they offer to users.

A practical and illustrative presentation of the capabilities of the product
The Eaton product comes to us in a simple box that is no different from any accessory that we can find on the shelves of a computer store. The packaging has a bright white background , where the blue color provides the necessary contrast to break the monotony of the design. The front of the box presents a reduced-scale image of the UPS , profusely surrounded by texts, all in English , that point out salient aspects of the device.

Detailed device information on the front of the box
On the front of the box, the manufacturer has arranged a kind of mini-guide of the device. Eaton exposes, in a very graphic way, how the UPS is connected and works , in addition to showing us some of the elements contained in the package. The box has a simple upper opening, after cutting the adhesive seal that keeps it closed. A cardboard separator keeps the elements contained inside safe from friction between them. Inside we find the UPS in question; an envelope with several barrel-type connectors ; the power input cable ; and a quick guide booklet .

Accessories included with the small UPS
3S Mini Design
When extracting the UPS Eaton 3S Mini we like the sensations that the product transmits. The quality of the accessory is appreciable , and it is surprising to be much more compact than we supposed. It is not a heavy device, but it is felt. The device weighs 370 grams , so it is easy to carry around. The tower format with rounded edges, designed to be placed horizontally , is concentrated in rectangular dimensions of 13.6 cm deep , 3 cm high , and 9.5 cm wide .

Compact and elegant design
The device sports an attractive appearance by combining the strong contrast of white with black in the halves of its chassis. The casing is made of plastic , and the manufacturer’s logo stands alone on the top. On the front it has, turned towards the extreme left, a set of LEDs and the only UPS button . Just below each of these elements are engraved the symbols that indicate the function and the voltage . The truth is that being in the black part of the chassis, it is difficult to appreciate them.

Rubber feet on the base that prevent slippage
On the opposite side of the button and lights is the connector for the power cable. The power cable for the other devices also comes out of this area. It is a fixed cable, unlike the one that connects the UPS to the electrical network. Finally, if we turn the device over, we will discover that small rubber feet have been placed on the base to ensure its location on any surface.
Device Features and Functionalities
The Eaton 3S Mini UPS is intended to keep a critical appliance running when a power outage occurs, long enough to weather the situation. Compared to the usual proposals, this model is distinguished by its small format, which allows it to be installed in limited spaces, and its very silent operation .

The button acts as a voltage selector
Of course, due to its small size, its use is limited to the field of peripherals with low consumption. The UPS offers us a power of 36 W , with the possibility of adapting the output voltage to 9V , 12V , 15V and 19V , with a maximum intensity of 3A . Inside it has a 2,200 mAh Li – Ion battery , capable of holding simple devices such as an IP camera for up to 5 hours , or keeping a router active for around 40 minutes .

The cable head prepared to exchange the barrel-type connectors
This device is very easy to use. First we select among the included connectors the plug that adapts to the device that we are going to feed. When turning on the UPS , we choose the appropriate voltage by pressing the button, until the LED that marks it lights up, and everything is ready so that when the power fails, the 3S Mini battery comes into play .
Technical specifications of the UPS Eaton 3S Mini
Here is a summary table with all the technical details and extras of the Eaton 3S Mini UPS :
UPS EATON 3S MINI | |
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GENERAL | |
Reference | 3SM36 |
Dimensions (D x H x W) | 136 x 30 x 95mm |
Weight | 370 grams |
Cable length | 1m |
Colour | Black White |
User interface | LEDs |
Certifications |
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Special features |
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SPECS | |
Power | 36W |
Output voltages and currents (DC) |
|
typical range |
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external design | Tower |
Feed Type | one |
tensions |
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Input voltage range | 100 – 240V |
Nominal frecuency | 50/60Hz |
Input frequency range | 46 – 70Hz |
Battery Type | Lithium Ion (user replaceable) |
Battery Rating | 2200mAh |
Number of batteries | two |
Performance | 78 |
Type of construction | Independent model |
Topology | Out of line |
Reserve time | 30 min |
Receptacle | (4) Barrel connection adapters |
input phase | one |
Noise level | Less than 25 dB at 1 meter |
Autonomy time at full load | 11 minutes |
OTHERS | |
Box contents |
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Conclusions, availability and price of the UPS Eaton 3S Mini

The Eaton 3S Mini UPS is an ally with multiple applications
The Eaton 3S Mini UPS is a really simple to use and tremendously useful product. It is not necessary, at this point, to point out the advantages of having the support of an uninterruptible power supply , no matter how sure we are of the stability of our electrical installation. Teleworkers will be able to stay connected long enough to overcome any unforeseen event, just as we will be sure that our smart devices or surveillance devices are still active even at critical moments .
To the Eaton 3S Mini UPS , for its functionality and number of uses , we awarded our Gold .
- Versatile and functional.
- Easy to use.
- Compact design.
- Only for small devices.