Lonsonho: Zigbee 3.0 Silent Relay Without Neutral Line, Home Assistant Integration

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The topic of this review will be a Zigbee relay, from Lonsonho. The device is focused on the Tuya Smart ecosystem and works with alternative smart home control systems through zigbee2mqtt or SLS gateway integration.

It has several features at once, firstly it has a modification that does not require a zero line, secondly, it is compact enough to fit in a standard round socket, and thirdly, mechanical switches can be connected to it, and fourthly, it is completely silent.


  • Options
  • Supply
  • Appearance
  • Disassembly
  • Connection
  • Zigbee2mqtt
  • SLS Gateway
  • home assistant
  • Switch
  • Usage
  • Video version
  • Buy on aliexpress – the price at the time of publication of the review is $ 16.99-21.99, depending on the modification


  • Relay type – single-channel, without neutral
  • Interface – Zigbee 3.0
  • Operating voltage – 220-240 V
  • Maximum power – 100 watts
  • Supply

    The relay arrived in a featureless cardboard box, neither on it nor on the relay itself there is either a manufacturer’s logo or information about compatibility with ecosystems. The buyer must know all this himself.

    Included – the relay itself, a plastic holder for it, which can be attached to anything and a small insction in English

    The insction contains relay connection diagrams – as you can see, it can be used both independently and paired with a mechanical switch or even a system of pass-through switches.


    The relay has the form of a square with beveled edges. The parameters of the relay are duplicated on the front part, the heads of the screws of the contact block are at the bottom. In the upper part, on the right, there is a hole for the reset button, which must be pressed with a paperclip.

    And access to the block is from the end. Contacts, as you can easily see, are clearly more than necessary, this is due to the fact that there is also a two-channel version of the relay, exactly the same size.

    The size of the relay is 46 x 46 x 18.5 mm, it is really very compact, and the thickness allows it to be used in a socket, under a mechanical switch.

    And this, together with a standard round socket box, even includes a complete relay holder that can be fixed permanently. And put a relay in the holder, or use it without a holder – according to the situation, there is still quite enough space in the socket


    The relay is disassembled quite simply – you need to pry off the back cover, which is held on by latches. It is possible that in some cases it will be more convenient to use it without an external case.

    The basis of the relay is the TYZS3 module, common for Tuya Smart ecosystem devices, the same is used, for example, in wall switches.

    The assembly is neat, there are no traces of flux not washed off, some streaks, soldering curve – no.

    It does not use an electromagnetic relay, so there are no clicks when switching. Everything works completely silently.


    The first option for connecting a relay is simply in a phase break. I want to once again draw attention to its power – up to 100 watts. If in the case of energy-saving lamps everything is simple, then LED lamps, with a small electric power, have very high starting currents that can disable this relay.

    The reset button, which must be pressed with a paper clip, also serves to manually turn the load line on and off.

    With a short press on the reset button, the relay switches its state, and only clicks of the pressed button are heard completely silently – see the video version of the review

    To switch to pairing mode, you need to hold the button until the blue LED starts flashing. This is the transition to pairing mode. When the device is connected, or the time for pairingns out – it will go out – see the video version of the review


    The relay is supported by Zigbee2mqtt integration – with the condition that the network coordinator is flashed on zstack 3. The connection is standard – turn on the mode for adding new devices and wait until the diode on the relay goes out. After that, it will appear in the system

    It is defined as a switch, in fact this is what it is, only without a button. Although the device has a stationary power supply, it does not have a zero line, so the relay is not a router for the Zigbee network

    SLS Gateway

    Will not bypass the relay and owners of SLS gateways. It also supports this device without any problems and also detects it as a wall switch. This does not entail any restrictions, except for an incorrect avatar.

    Naturally, here it is also defined as an end device.

    home assistant

    In Home Assistant, no matter what you use – z2m or SLS, the device is forwarded in exactly the same way, with two entities – a switch and a signal quality sensor.


    Now we will connect the switch to the relay. It closes the com and S1 pins and can control the relay locally, similar to a short press on the reset button

    Thus, if you place the relay in the socket, and by connecting a phase break to it, you can leave a mechanical switch on top of it, which can be used in the usual way. The status of the relay is transmitted in real time to the control system and displayed correctly. Mechanics and logic work in parallel. You can turn it on logically, and turn it off mechanically. The state of the switch does not play a role, the relay catches the very moment of switching. Therefore, switches with a return button can be used here without any problems.

    For more details on how the relay works in this mode, see video review version


    An example of installing a relay in a conventional round socket. We connect the incoming phase wire to contact L, and the outgoing wire to L1.

    Then we sink the relay into the socket. In my case, a logic switch is placed on top of it, the plus is that you do not need to remake the socket for a square back. Or you can connect and install a mechanical switch. The signal level is more than sufficient for the relay to work.

    A couple more important points. After power is restored, the relay will be turned off. Once again, I draw your attention to the peculiarity of the operation of LED lamps, they have high starting currents, which can damage the output path. There is no electromechanical relay here, the triac is engaged in switching, which can be broken through. I must say that this happened to me during the tests, when trying to connect a 40-watt LED chandelier. Although the device itself works, and is visible to the network map and responds to commands, its output is now closed all the time, the triac needs to be replaced. So be careful.

    Video version

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