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[ZIGBEE] 20A Zigbee socket with energy metering (Tuya TS011F_plug_3)

@GUTEK@ 1212 8
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    I bought my first Zigbee socket, taking advantage of the fact that there were promotions on Ali, it came out to about 10,50zł.
    Exactly at this seller: https://pl.aliexpress.com/item/1005007256414108.html

    Today it came to me with the rest of the shpeju and I would not be myself if I did not start by taking it apart and see what is inside. And it is well... judge for yourself:

    - a protective cable from the "pin":
    A caliper measures the thickness of a metal component inside a disassembled Zigbee socket, showing 0.85 mm. .

    - capacitor(s) on the low voltage side 470uF/10V:
    A digital caliper measures an electronic component on a circuit board, displaying 7.99 mm. .

    - where is the stabiliser from 5V to 3.3V?
    A Zigbee socket’s circuit board with visible capacitors, ICs, and power terminals. JIEYING 3V relay mounted on a Zigbee socket PCB, with visible metal prongs. .
    And it doesn't. It is likely that the BP2525 inverter chip is set to 3.3V mode. And the relay itself is on 3V instead of 5V.

    - The Zigbee module itself is also quite mysterious:
    Close-up of the disassembled interior of a Zigbee smart socket, showing the relay module and electronics. .

    - Only the BL0937 chip from energy measurement standard:
    Close-up of the Zigbee socket PCB showing the BL0937 chip. .


    When I saw this my first thought was, this cannot work well and.... I was right. After adding it to Zigbee2Mqtt and displaying the model description, it turned out:
    - a lot of people report that the socket automatically shuts down
    - the socket doesn't automatically report indications of voltage, current, that's why they did a polling every 60s (default, you can change this time or turn it off completely)
    More here: https://www.zigbee2mqtt.io/devices/TS011F_plug_3.html

    I took a quick measurement with a wattmeter, the switched off socket draws about 0.1W, while the switched on one draws 0.7W. Something a lot this 3V relay draws.

    I'll now leave the socket on for a couple of days and see if it switches itself off. I think these switch-off problems, if they occur, are from an unstable power supply.

    EDIT:
    I'm also throwing in a photo of the thermal imaging about 40min after switching it on. There is no tragedy.
    Thermal image of the interior of a Zigbee smart plug showing hot spots up to 49.5°C after 40 minutes of use. .

    Cool? Ranking DIY
    About Author
    @GUTEK@
    Level 31  
    Offline 
    @GUTEK@ wrote 1536 posts with rating 327, helped 161 times. Live in city Gliwice. Been with us since 2005 year.
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  • #2 21574786
    p.kaczmarek2
    Moderator Smart Home  
    All powered from 3.3V? I don't think I've seen that before. I wonder how much they saved by removing those LDOs.

    And the power_outage_memory option works? Supposedly it should remember its last state after a reboot.
    Helpful post? Buy me a coffee.
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  • #3 21575464
    @GUTEK@
    Level 31  
    I haven't checked the power_outage_memory yet, I'll check. For now, the plug has been with the relay on since yesterday and so far it hasn't switched off by itself.
    I also found a review of this model and there it is described that the problem of switching off occurs when the socket is on but with no receiver plugged in, if there is some power consumption then it works ok. Interesting.
    https://smarthomescene.com/reviews/tuya-zigbee-16a-smart-plug-review/

    And I found the same one here on the electrode, only the wifi version. And nobody noticed the truncated design in it, and the topic ended up reinventing the wheel: https://www.elektroda.pl/rtvforum/topic4040624.html
  • #4 21575803
    p.kaczmarek2
    Moderator Smart Home  
    Interesting find, you may want to make a note of the main PCB markings: RM-JG003-MAC2HG
    Here seems to be a version of it on LN882H:
    Template and firmware information for the generic Tuya EU WiFi Smart Plug with LN .
    Helpful post? Buy me a coffee.
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  • #5 21576996
    CosteC
    Level 39  
    Well, for the thickness of the PE wire, this deserves a denunciation to the OCC because this wire will not carry 16 A long term, which is what it is obliged to do.
    That is to say, dangerous electrical junk. A bit of a shame because it looks interesting.
  • #6 21578492
    @GUTEK@
    Level 31  
    CosteC wrote:
    Well, for the thickness of the PE wire it deserves a denunciation to the UOKiK because this wire will not carry 16 A long term, which is its duty.
    .
    Here the seller's details:
    Screenshot showing business information for seller Shenzhen Ruomu Zhilian Technology Co., Ltd. on AliExpress. .
    you can report, I'm very curious what the office is supposedly going to do about it.
    If you buy cheap electronics on Ali then practically every other device could be reported for irregularities.

    p.kaczmarek2 wrote:
    And the power_outage_memory option works? Supposedly it should remember its last state after a reboot.
    .
    I checked, yes it works, when set to restore the last state after unplugging a switched outlet, when plugged back in after about a second it turns on the relay.

    In general, during testing from Monday when I wrote the topic, until now (Friday), the socket did not switch itself off even once. So either this is a corrected version, or something else must have occurred, or it is a coincidence.
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  • #7 21578832
    CosteC
    Level 39  
    @GUTEK@ wrote:
    Seller details here:

    you can report, I'm very curious what the office is supposed to do about it.
    When buying cheap electronics on Ali, practically every second device could be reported for irregularities.
    .
    According to Polish law, the importer is to blame - it is the importer who imports goods that do not comply with Polish law. A Chinese manufacturer can produce goods in China that do not comply with Polish regulations - after all, it is in China.

    I wonder when home insurers will consider the use of appliances without CE as a good reason to refuse to pay a fire claim. CE is not just a stamp, a declaration of conformity issued by the marketer, in this case the importer, is also required. And I don't even see a stamp on yours....
  • #8 21617364
    SylCiu
    Level 8  
    How does the LED colour change on the button? I bought 1pc on trial from one dealer then wanted to buy more, he didn't have it so I bought from another. The first socket lights up blue when off and when I turn it on it still lights up red and looks like a pink colour. The other ones don't light up when switched off and when switched on the blue LED lights up. Same model and yet they are different. There are some LED indicator settings in the settings but changing this setting does not change the LED behaviour.
    Two wall switches with LED backlight, one glowing blue and the other showing a pinkish hue. .
    [ZIGBEE] 20A Zigbee socket with energy metering (Tuya TS011F_plug_3) .
    [img-1]

    In my case there is a CE mark on the packaging but bought on Allegro from a Polish company.
  • #9 21617387
    @GUTEK@
    Level 31  
    I also have the CE mark on the packaging, and I bought on Aliexpress from 'my friend'.

    The behaviour is that there is only a blue led, which by default lights up when the socket is plugged in, but with this indicator option you can change these settings and it works.

    I would not suggest the model for these sockets. The model may be the same on the casing, but the components are completely different. Even if you buy within a month from the same dealer.
    If you want something the same then buy some brand name ones, or at least ones that have some brand name printed on them e.g. Aubess, Avatto, Moes.
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Topic summary

A user purchased a 20A Zigbee smart socket with energy metering (Tuya TS011F_plug_3) from AliExpress and disassembled it to analyze its internal design. The device notably lacks a traditional 5V to 3.3V voltage regulator, likely relying on a BP2525 inverter chip configured for 3.3V operation, including the relay coil. The socket uses capacitors rated 470uF/10V on the low voltage side and features a protective cable on the pin. Discussions highlighted concerns about the absence of low-dropout regulators (LDOs) and the unusual powering of all components at 3.3V. The power outage memory function was tested and confirmed to restore the relay state after power loss, with stable operation observed over several days. A review noted that the socket may switch off unexpectedly if no load is connected, but remains stable under load. The main PCB is marked RM-JG003-MAC2HG, and a related version uses the LN882H chip. Safety concerns were raised regarding the thin protective earth (PE) wire, which may not safely support the rated 16A current, posing a potential hazard. Legal responsibility for non-compliance with Polish electrical standards lies with the importer, and the device lacks visible CE certification. The discussion includes references to similar devices and firmware templates for Tuya EU WiFi smart plugs.
Summary generated by the language model.
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