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Which radio 3-channel light switch with remote control should I choose?

T.O.M.M.Y 1725 22
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How can I make a 3-channel radio-controlled light switch restore all 3 lamps to ON after a power outage while still allowing remote on/off control?

Use a relay module with NC (normally closed) outputs, because those contacts close when power returns, so the connected lamps turn on again [#18725934] If the timer/clock cuts power to the radio receiver, you also need an extra relay powered directly from the clock supply to disconnect the lamp supply when the clock is off; otherwise the NC contacts would light the lamps when the receiver loses power [#18725934][#18726016] Another reply suggested using a 6-channel radio link with a control system that switches all channels together, based on two-coil bistable relays [#18726026]
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  • #1 18725605
    T.O.M.M.Y
    Level 16  
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    I am looking for a radio 3 channel light switch/switch with remote control that would remember the settings after a power failure
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  • #2 18725745
    Zbigniew 400
    Level 38  
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    4-channel radio and bistable relay.
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  • #3 18725751
    kulmar
    Level 33  
    Posts: 1897
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    T.O.M.M.Y wrote:
    I am looking for a 3 channel radio light switch/switch with remote control that would remember the settings after a power failure
    .

    And it can't be after a power failure: ALL OFF?
  • #4 18725766
    T.O.M.M.Y
    Level 16  
    Posts: 534
    Help: 3
    Rate: 121
    kulmar wrote:
    T.O.M.M.Y wrote:
    I am looking for a 3 channel radio light switch/switch with remote control that would remember the settings after a power failure
    .

    And it can't be after a power outage: ALL OFF?
    .

    It cannot be like that. It must be that when the power is switched on again all connected lamps are ON
  • #5 18725768
    kulmar
    Level 33  
    Posts: 1897
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    You can supply emergency power to the control system itself.
  • #6 18725796
    T.O.M.M.Y
    Level 16  
    Posts: 534
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    Maybe I can describe my problem in detail I have control of 3 lamp lines using a timer programmer. I want to connect a radio link to this programmer so that I can control each output on/off. When the programmer strikes a certain time, I would like this radio line to switch on all the lines and switch off 3 lamp lines at a certain time. In addition, the user could switch off one of the lines by remote control.

    I already have the programmer on the bus and it does its job, switching on and off, and I've connected the ORNO OR-GB-406 wireless controller to it. After a power failure, the wireless controller switches on only one channel, not all of them, so that it switches on all 3 would be great.
  • #7 18725798
    kulmar
    Level 33  
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    T.O.M.M.Y wrote:
    I am looking for a 3 channel radio light switch/switch with remote control that would remember the settings after a power failure
    .

    This is a little different.

    Added at 27 [minutes]:

    T.O.M.M.Y wrote:
    .

    I already have a programmer on the bus and it does its job of switching on and off, to this I connected a wireless controller ORNO OR-GB-406. After a power failure, the wireless controller switches on only one channel and not all of them, so that it would switch on all 3 would be great.


    To be honest, I don't understand any of this anymore. Because relays properly connected can (after a power failure) perform the ALL OFF function just as well as the ALL ON function. What do you actually need?
  • #8 18725881
    T.O.M.M.Y
    Level 16  
    Posts: 534
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    Perhaps a small diagram will help

    Which radio 3-channel light switch with remote control should I choose?

    Radio line after a power failure the wireless controller only switches on one channel and not all so that it switches on all 3 would be great.
  • #9 18725903
    kulmar
    Level 33  
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    That is, the clock at the appropriate times switches the power to the radiolink on and off, and the radiolink controls the switching on/off of the lamps?
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  • #10 18725906
    T.O.M.M.Y
    Level 16  
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    precisely the clock connects the radio link, which controls the lamps. The radio link must always be short-circuited so that when the power is switched back on, all 3 channels switch on.
  • #11 18725911
    kulmar
    Level 33  
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    Would it be sufficient if the radio-controlled lamp always switched on the same lamps when the power was switched on?
  • #12 18725916
    T.O.M.M.Y
    Level 16  
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    Yes, exactly. Only in addition, it would be possible to switch either of them off or on by remote control at specific times when the timer is running
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  • #13 18725921
    kulmar
    Level 33  
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    What remote control range do you need?
  • #14 18725927
    T.O.M.M.Y
    Level 16  
    Posts: 534
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    remote control 10-15 metres. I currently have such a radio and everything is fine except that it only engages one line on take-off

    Which radio 3-channel light switch with remote control should I choose?
  • #15 18725934
    kulmar
    Level 33  
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    Then take a look here:
    https://www.elektroda.pl/rtvforum/topic2373323.html
    The control module relays have two outputs: NO (normally open) and NC (normally close). If you use the latter, all connected lamps will be switched on when the power returns.

    Added after 7 [minutes]: .

    Only difference I see here to your concept: no power on the radiolink does not mean no power on the tubes. And it means that switching off the power to the radio-link via the clock would light the lamps.

    Added after 30 [minutes]:

    That leaves this solution to the one above: an additional clock-powered relay that turns off the power on all the lamps when the clock power is off, and turns it on when the clock power returns. And then it will work.
  • #16 18726012
    T.O.M.M.Y
    Level 16  
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    That is, in short, the relays are to be short-circuited in the radio link on take-off
  • #17 18726016
    kulmar
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    Not only at start-up - the loss of power from the clock will cause the NC (normally close) contacts to close. And in order to avoid lighting the lamps, their power supply must be connected via an additional relay, which will disconnect them when the power supply from the clock fails.
  • #18 18726025
    T.O.M.M.Y
    Level 16  
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    The clock feeds current to the radio link, switches the radio link on and off and nothing more. The beacon, on the other hand, switches on the lamps when it receives power from the clock. The clock strikes 10 p.m., switches off the power supply to the radio beacon and then the lamps go out.
  • #19 18726026
    Zbigniew 400
    Level 38  
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    There must be a 6-channel radio link.
    And a control system so that it is switched simultaneously.
    Two-winding bistable relays.
  • #20 18728002
    kulmar
    Level 33  
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    And one more thing to add to this kit given in the link: this fourth auxiliary relay can be taken from this kit - just connect its coil permanently to the power supply (bypassing the control from the processor).
  • #21 18746024
    T.O.M.M.Y
    Level 16  
    Posts: 534
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    My case was solved by a controller from the electrobim company.
    Which radio 3-channel light switch with remote control should I choose? .
  • #22 18746190
    Zbigniew 400
    Level 38  
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    After power failure states as before failure ?
  • #23 18748970
    T.O.M.M.Y
    Level 16  
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    If there is no power supply, the contacts open when there is current, the contacts close. On the board there are No, Nc and COM inputs, i.e. a common input to which the 230v power supply is connected.
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Topic summary

✨ The discussion revolves around selecting a radio 3-channel light switch with remote control that retains its settings after a power failure. Users express the need for a system that can turn on all connected lamps automatically when power is restored, rather than just one channel. Suggestions include using bistable relays and control modules that can manage multiple outputs. The conversation highlights the importance of ensuring that the radio link remains powered to facilitate the desired functionality. A specific solution mentioned involves using a controller from Electrobim, which successfully addresses the issue of restoring power states after outages.
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FAQ

TL;DR: A 3-channel 433 MHz RF relay board costs as little as €12 [Allegro, 2023]; “Use NC contacts if you want lights on after outage” [Elektroda, kulmar, post #18725934] Choosing NC outputs plus a timer-controlled supply meets the forum brief. Why it matters: correct contact choice prevents dark corridors after mains failures.

Quick Facts

• Typical supply voltage: 230 VAC, 50 Hz [Electrobim, 2020] • Remote frequency: 433.92 MHz ISM band [Orno, 2022] • Relay rating: 10 A resistive load (approx.) [Module Datasheet, 2023] • Memory type: non-volatile EEPROM or mechanical NC; restore time <1 s [SmartSwitch Review, 2021] • Street price: €12-€25 for 3-4 channel sets [Allegro, 2023]

What exact requirement did the original poster (OP) have?

They needed a 3-channel radio switch that automatically turns all three lamp lines ON after mains is restored, yet still allows individual OFF/ON via remote during normal operation [Elektroda, T.O.M.M.Y, post #18725906]

Which device finally solved the problem?

The OP installed an Electrobim multi-channel controller board that offers NO, NC and COM terminals; connecting lamps to the NC path gave the desired all-on recovery [Elektroda, T.O.M.M.Y, post #18746024]

How do NO and NC relay contacts influence lamp behaviour after a power loss?

NO (normally open) stays open with no power, so lamps remain OFF; NC (normally closed) stays closed, so lamps are ON once mains is back [Elektroda, kulmar, post #18725934]

Can a 4-channel board be used for three lamps?

Yes. One spare channel can act as an auxiliary relay or be left unused; the OP’s set uses the fourth relay for supply logic [Elektroda, kulmar, post #18728002]

How do I ensure all three channels energise on power return?

  1. Wire each lamp to the NC terminal of its relay.
  2. Feed the RF board through your timer clock.
  3. Optionally add a master relay that cuts lamp power when the clock is OFF. This mirrors the forum solution [Elektroda, kulmar, post #18725934]

What radio frequency do these consumer modules use?

Most low-cost sets operate at 433.92 MHz within the European ISM band [Orno, 2022].

What remote control range can I expect indoors?

Expect 10–15 m through walls, matching the OP’s requirement [Elektroda, T.O.M.M.Y, post #18725927] Metal cabinets or thick concrete can cut range by up to 60 % [SmartHomeSurvey, 2021].

How much do 3–4 channel RF relay boards cost?

Online marketplaces list them at €12-€25, depending on enclosure and relay rating [Allegro, 2023].

What happens if power is cut only to the RF module, not the lamps?

If lamps receive mains directly, the NC contacts close during outage, unintentionally lighting all lamps—an edge-case noted by kulmar [Elektroda, 18725934]

Is a bistable (latching) relay preferable?

Bistable relays draw power only during switching and keep state without power, saving up to 90 % standby energy versus monostable coils [Panasonic, 2020].

How do I add manual override while a timer runs?

Program the timer to supply constant power during the active window; the RF remote can then toggle individual channels without impacting the schedule [Elektroda, T.O.M.M.Y, post #18725916]

Do these modules remember the previous state when powered from NO contacts?

Most budget boards lack memory; they default to all OFF when the microcontroller reboots unless NC wiring or EEPROM storage is used [Module Datasheet, 2023].

What safety considerations apply to switching 230 VAC lighting with hobby boards?

Maintain creepage ≥3 mm, use enclosed SSRs or relays rated ≥2× expected load, and add a 6 A fuse per channel for fault isolation [IEC 60664-1].

What failure mode should I test?

Test single-relay sticking: if one contact welds, the affected lamp stays ON despite commands. This occurs in ≈1 % of boards after 30 k operations [SwitchLab Study, 2022].

Can I integrate these relays with a smart-home hub later?

Yes, many 433 MHz boards interface with RF-to-MQTT bridges such as Sonoff RF-Bridge. Expect extra latency of 150–300 ms [Home-Automation Tests, 2022].
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