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Relay switch - Live or Neutral to connect?

Discussion in 'General Electronics Discussion' started by aadesh103, Jan 31, 2021.

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  1. aadesh103


    Jan 31, 2021
    I'm trying to control a small table lamp with AC power, using a relay switch board with a Songle srd-05vdc-sl-c. There are 3 screw ports for each of these relays (the board came with two). After a few experiements with an LP (the 3.3V works! i can hear the click sound from the relay) I figured how to control the on/off of the relay box.

    If i understand the relay circuit correctly, either neutral or live from the AC part is to be cut and connect to the screw ports, so that the relay switch can complete the circuit and control it.

    Now my question is, on the AC part, there are 3 wires - ground, neutral, and live. Should I cut neutral or live for connecting to the relay?

    Thanks in advance [​IMG]
  2. bertus

    bertus Moderator

    Nov 8, 2019

    It is a usual practice to switch the live side.
    When switching the neutral side, the switched device is still connected to live.

    davenn and Martaine2005 like this.
  3. aadesh103


    Jan 31, 2021
    Thank you for your response and help.
  4. davenn

    davenn Moderator

    Sep 5, 2009
    aadesh103 has been banned for spamming in his response
    spam now removed

    this thread is now closed
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