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I take a look inside a residual current circuit breaker (RCCB), also known as a residual current device (RCD). This super cheap clearance item came from Screwfix.
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By Julian

Youtuber, shed dweller, solar charge controller aficionado

12 thoughts on “Rccb for 1.53 – clearance rcd stripdown”
  1. Avataaar/Circle Created with python_avatars Karl Besser says:

    The permanent magnet holds the trip lock in the on position until a fault current weakens the flow through the relay, causing it to drop out.
    These RCDs are completely sufficient for household applications, since the direct current problem does not exist there.

  2. Avataaar/Circle Created with python_avatars t1d100 says:

    In the USA, we have devices that have their controls passed on the house wiring. I have never owned such, so I don't know what they might be. If this safety switch doesn't like DC, it would seem that these devices could defeat the switch. Maybe that is why your switch model is being discontinued…

  3. Avataaar/Circle Created with python_avatars andymouse123 says:

    Interesting find….cheers.

  4. Avataaar/Circle Created with python_avatars ANT&TEC says:

    Clearance probably because the regulations have changed again 🤣
    Change all the time!

  5. Avataaar/Circle Created with python_avatars ElectroBlud says:

    Green = OFF and Red = ON is very common with disconnector switches in medium and high voltage. It is meant as green = safe to touch (after grounding); red = gtfo

  6. Avataaar/Circle Created with python_avatars You2ber says:

    Why not showing the toroid? It would be interesting to see if the current of the sensing winding is sent directly to the solenoid or instead "processed" somehow by some other components…

  7. Avataaar/Circle Created with python_avatars James Hunt says:

    if you ever want to know the flag colours, red = dead, green = safe, same with traffic lights and guns… but you usually only get a red dot on guns

  8. Avataaar/Circle Created with python_avatars Lego Mini Movie Productions says:

    I only use outdated non-compliant parts for like testing/experimenting stuff (but then not as an rcd but as simple 63A switch)

  9. Avataaar/Circle Created with python_avatars andy fletcher says:

    This breaker is an AC type and essentially obsolete. New installations now need type A which can handle a DC component in the load, you can now only use type AC where there is no possibility of DC components on the load.

  10. Avataaar/Circle Created with python_avatars WaffleStaffel says:

    I wonder if there's more than £1.53 in the silver contacts. Probably not. But close.

  11. Avataaar/Circle Created with python_avatars Richard Halliday says:

    Thanks for that Julian, my local Screwfix had one in stock, at thirty bob it would be rude not to.

  12. Avataaar/Circle Created with python_avatars The Embedded Hobbyist says:

    it's the difference between what you get if you hold the live and then touch either the earth or the neutral. Do the earth test first as doing the neutral first you will not live long enought to do the other test.🙂

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