Safety concerns small 5V power brick

[MisterD]

Hello,

I would like to power an ESP32 using one of these:

https://www.aliexpress.com/item/TSP-05-replace-HLK-PM01-AC-DC-220V-to-5V-mini-power-supply-module-intelligent-household/32705471039.html?spm=2114.search0104.3.17.Zf7HkO&ws_ab_test=searchweb0_0,searchweb201602_3_10152_10065_10151_10068_10344_10342_10343_10340_10341_5470017_10304_10307_10137_10060_10302_10155_10154_10056_10055_10054_10059_5370017_10532_100031_10099_5460020_10338_10339_10103_10102_10052_10053_10142_10107_10050_10051_5380020_10326_10084_10083_10080_10082_10081_10177_10110_10111_10112_10113_10114_143_10312_10313_10314_10078_10079_10073-10051,searchweb201603_23,ppcSwitch_2&btsid=7c555468-0e23-4eae-9839-a32e9ed73606&algo_expid=13fdb94f-2cd5-4c31-8b34-24e4889c78fb-2&algo_pvid=13fdb94f-2cd5-4c31-8b34-24e4889c78fb

or

https://www.aliexpress.com/item/Free-Shipping-220V-5V-AC-DC-terisolasi-Rumah-pintar-HLK-PM01-Beralih-step-down-modul-power/32351477609.html?spm=2114.search0104.3.25.Zf7HkO&ws_ab_test=searchweb0_0,searchweb201602_3_10152_10065_10151_10068_10344_10342_10343_10340_10341_5470017_10304_10307_10137_10060_10302_10155_10154_10056_10055_10054_10059_5370017_10532_100031_10099_5460020_10338_10339_10103_10102_10052_10053_10142_10107_10050_10051_5380020_10326_10084_10083_10080_10082_10081_10177_10110_10111_10112_10113_10114_143_10312_10313_10314_10078_10079_10073-10051_10112,searchweb201603_23,ppcSwitch_2&btsid=7c555468-0e23-4eae-9839-a32e9ed73606&algo_expid=13fdb94f-2cd5-4c31-8b34-24e4889c78fb-3&algo_pvid=13fdb94f-2cd5-4c31-8b34-24e4889c78fb

Are any of these types of devices safe? I would like to place this in a wall behind a wallswitch, so I'm concerned for firehazards. Looking at the specs it should be ok.

Or should I look at other sites to order something like this? (RS components or others?).
Other things I should look out for? Ripples on the output?

Best regards,
Jan

[rdl]

In the US, and probably elsewhere, you can buy replacement AC outlets with built in USB power ports. That is what I would try to use.


http://www.homedepot.com/b/Electrical-Dimmers-Switches-Outlets-Outlets-Receptacles/USB-Port/N-5yc1vZc33aZ1z0r7vs

[Back2Volts]

In the US, and probably elsewhere, you can buy replacement AC outlets with built in USB power ports. That is what I would try to use.


http://www.homedepot.com/b/Electrical-Dimmers-Switches-Outlets-Outlets-Receptacles/USB-Port/N-5yc1vZc33aZ1z0r7vs

       I have one 2xoutlet/2xUSB from EATON at hand.   Rated 3.1A.  It has the back shell held with star screws, so it could be open and possibly put wires to the back.   That said  I have never seen switch/USB plug combinations.   All I have seen are outlets/USB.   

[Back2Volts]

Are any of these types of devices safe? I would like to place this in a wall behind a wallswitch, so I'm concerned for firehazards. Looking at the specs it should be ok.

Or should I look at other sites to order something like this? (RS components or others?).
Other things I should look out for? Ripples on the output?

Best regards,
Jan

I find the whole thing very risky...  my concern would be the legal/insurance implications if there was a fire.   

There are ac/dc converters in the same form factor from known brands.   A quick MOUSER search shows a MEAN WELL unit around $7.   How would you integrate the whole thing?   How would you handle the mains connection?   How much spare space you have in the electrical box?   

[MisterD]

See attached image. I was thinking of putting the 5v power brick into the wall electrical box and fuse it. The 5v will drive an esp32 board and a relay to switch lighting. Also thinking about putting the relay and power brick into a small 3d printed box separated from the esp32.

[mbless]

The Hi-link power supplies have been discussed in length here with a good review here.

I've tried them out with success, but I also used a MOV, fuse and a thermal fuse to be safe. I also bought them through aliexpress and received counterfeit ones, so I'd buy them through their website instead.

Edit: *standard warning about mains electricity killing you if you don't know what you're doing*