type 1 MCB's

Discussion in 'Electricians' Talk' started by luffo, Oct 25, 2003.

  1. luffo

    luffo New Member

    does anyone know where you can get type 1 mcbs as I can only find Type B + C?
  2. Brightspark

    Brightspark New Member


    Why would you want a type 1 mcb?? to be honest the old type 1 mcb's (BS3871) are no longer used and there aint much differance between the type 1 and a 'B' rated MCB.

    the differance being : type 1 will definitely trip within 100ms at 4x rated current

    Type B will difinetley trip within 100ms at 5x rated current.

    Hopes this answers your question.
  3. daddy_sparky

    daddy_sparky New Member

    Type 1 MCB's are now obsolete, as are types 2,3 and 4 following changes to British Standards to harmonise with the rest of Europe. Types B,C and D are the only types now available. New circuits should not be added to types 1-4 even if they are spare in a consumer unit.
  4. luffo

    luffo New Member

    so there is nowhere where i can buy just one 32A type 1 mcb but instead i have to fit an entire new board!
  5. supersparky

    supersparky New Member

    do the modern type b mcb's from the same make not fit?
  6. luffo

    luffo New Member

    i should presume not and i don't have money to waste
  7. JasonP

    JasonP New Member

    The best way to obtain obsolete MCB's is via a dedicated electrical wholesaler. (Sorry Screwfix)

    If you know the make and model number of the consumer unit then you may be able to obtain modern compatibles.
    In fact many new compatibles will have the newer "type" ratings. (Check the new versions of the plug in MCB's for the Wylex standard range consumer unit. These are now type B)

    I'm afraid when doing maintenance work trying to explain that because of a failed MCB the whole unit has to be scrapped doesn't work. I frequently have to source Wylex NBxx type2 MCB's for example. If the earth loop impedance of the circuit is low enough to comply with the required disconnection time then there is no real problem.

    Out of interest do you know what make and model the consumer unit is?
  8. supersparky

    supersparky New Member

    i should presume not and i don't have money to waste
    when i suggested that i got my head bitten off, shouldent of bothered
  9. luffo

    luffo New Member

    chill supersparky! its a memera 21<u>?</u> the fuses have crabtree written on them
  10. supersparky

    supersparky New Member

    memera 21? with crabtree breakers? strange memera is made by mem...... and crabtree is atotaly different make... but if they fit fair enough, mem will most likely fit here is mems website there technical will probrably be able to help you best;
  11. supersparky

    supersparky New Member

  12. JasonP

    JasonP New Member


    We have to maintain some Memera 21 consumer units and getting parts isn't easy.

    Additionally to my knowledge the current (No Pun Intended) range of MEM MCB's are not compatible to the old Memera21 range. However some manufacturers may fit (I'm not always keen to do this - In fact when I do it has to mount the same and fit unmodified. The amount of times I find different mcbs "hanging" off the busbar unsecured is far too frequent)

    Finally I think we had some luck with Newey and Eyre (Sorry again Screwfix)or Hagermeyer as they are now.

    Good Hunting.

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