It is indeed, part of something I want to build in my home. The first thing I thought I could do was to place it in a plastic or cardboard box. But is there no risk of overheating if I do so?

If you could expand your answer with ways to safely protect it, that would be much appreciated.

Do you have the datasheet and manual for your power supply what the manufacturer says about in which conditions the power supply must be operated?

Sorry, I haven't received the device yet and the website on which I have bought it doesn't disclose any information. I should get it within the next 2-3 days so I'll update my question whenever I have more information. Thanks so far.

@MrUpsidown Surely there must be manufacturer name and model? If you don't know what you bought and how to use it, why do you think it is even safe to use? Does it have certifications that it is approved for use in your country? Beware if you ordered it abroad, you may now be the importer of the product and if it burns down your house, you can't apply for damages from the seller.

All good points here. Let me give you all the details I have: 1) I ordered it from China 2) It says the manufacturer is MSX and model name is MSX800 but I couldn't find any further info about the brand/model 3) It says CE Certified (and I live in Europe).

CE means ‘China Export’ not conformite European.

@Kartman how do you know that? So in your opinion, my product is "China Export Certified"? What does it mean?

@MrUpsidown I believe it refers to a problem where either it is not the CE symbol at all but a similar clone to fool people, or it's the CE mark but stamped on a product which should not have the CE mark. Let's hope the product really is made up to standards and can legitimately carry the CE mark, but it might be you may have bought a product with a fake CE mark.

@Justme thanks for the info. I guess I'll have a hard time figuring out whether the CE certificate is fake or not but I will try anyway.

CE in no way implies that it has been certified by a nationally recognized testing laboratory as meeting electrical safety standards. That thing must be mounted in a real enclose (NOT cardboard, maybe plastic if it can take the heat, literally).

@MrUpsidown Avoid cardboard at all costs! It may not be insulating enough, depending on type, and if it gets wet for any reason it could do nasty thing (never, ever mix electricity and liquids, unless you know VERY WELL what you are doing), and kids are very likely cause for things to get wet in a normal household!

@LorenzoDonatisupportUkraine yes, that was a poorly thought statement. After thinking a bit, cardboard or any other flamable material sounds like a very bad choice :) Thanks for your input.

@JonCuster true, it doesn't mean it has been tested by a certified lab or anything like that but if the manufacturer has the right to use the CE marking, it has to comply with the EU regulation (unless it's a fake, obviously). Out of curiosity, I just asked the Chinese seller whether the product was indeed CE certified and their answer was Yes, please do not worry. This made my day!

Note the "manufacturer's declaration" part - it is a self declaration, and a Chinese company out of reach from the EU has no problems declaring it.

@Kartman Probably you are joking, but just to be sure: there is no "china export" marking. Chinese manufacturer of cheap or bogus devices use to put the CE mark on their product even if it doesn't conform to EU regulation. To avoid incurring in "EU commission wrath", they changed the symbol (the letters are shrunk horizontally) so that possible lawsuits or WTO actions could "fizzle". This practice has lead to naming that squeezed CE symbol "the China Export" symbol as tongue in cheek.

@MrUpsidown It sounds to me like you have no evidence whatsoever that this product is actually safe (aside from the seller's claims, which don't mean much because sellers lie about this sort of thing all the time).

@MrUpsidown how are your kids going to be protected from the rest of the circuit you are going to build?

@Tanner-reinstateLGBTpeople I don't, that's true. And of course that statement from the seller was laughable. I might get a clearer view tonight when/if I get the product delivered.

@user253751 The rest of the circuit should be safe and won't be reachable by the kids. I will of course take all necessary precautions.

@MrUpsidown then put the power supply in the same place so the kids can't reach it either

An earthed (grounded) ventillated metal enclosure is liable to be a good idea. || European CE markings indicate certification standards are claimed BUT as others note self declaration is a val;id choice. || The Chinese CE mark means, literally, made in China. The symbols used are significantly different BUT you need to know which is which.

I just noticed the specs, 300W and 48V does not add up to 8.3A, it's only 6.25A. Unless that is a typo, it is suspicious. In any case, it might push nearly 300W into about 8 ohm load, so everything needs to be wired with correct gauge wire and terminated properly to screw terminals (no bare wire) and fused properly for safety. The last safety bit, even if supply is correctly mounted in ventilated and earthed/grounded metal case, let's hope the insulation is good and the 48V won't become live with mains.

@Justme I'll update my question with the exact specs as soon as I get my hands on it (I suppose I have opened this question a bit too early and I wasn't expecting to get that much feedback). Unfortunately, my package has now turned into a UFO (Unidentified FedEx Object) and nobody seems to know where it is...