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search for a Varistor replacement compatibility

Discussion in 'General Electronics Discussion' started by itai shi, Apr 22, 2016.

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  1. itai shi

    itai shi

    18
    3
    Apr 22, 2016
    Hi,
    i need a new varistor insteed of a currpt one,
    i cant find the exact varistor model.

    original compenent:
    the exact model is 14d681k-M
    [​IMG]
    name Varistor
    model 14d681k
    max volt ac420v, dc560v
    Varistor 680V
    terminal volt and current (max v / a) 1120v, 50a
    capacity 290pf
    Watt 0,6 W

    the problem:
    i cant find the original.

    my question:
    is anybody know if this one, on the buttom, can replace it ?
    its not look the same at all.
    looks different size,
    is the replacement suppose to do the exact functioning as the original?

    the replacment:
    http://uk.farnell.com/bourns/mov-14d681k/varistor-680v-420vac-560vdc-14mm/dp/2078692
    [​IMG]

    thanks in advanced,
    itai.
     
  2. dorke

    dorke

    2,342
    665
    Jun 20, 2015
    Welcome to EP.
    From what equipment have you pulled it out?
     
  3. itai shi

    itai shi

    18
    3
    Apr 22, 2016
    hi dorke,
    thanks for your help,

    i need to fix my air condition outside unit circuit,

    this type of circuit is: KFR90GW / I1Y

    upload_2016-4-22_14-47-9.png
     
  4. dorke

    dorke

    2,342
    665
    Jun 20, 2015
    Probably a Chinese part.
    The black one is much larger ,where did you get it's specs , can you post a link to it?
     
    Last edited: Apr 22, 2016
    itai shi likes this.
  5. itai shi

    itai shi

    18
    3
    Apr 22, 2016
    i found somewhere this,
    (i'll try to find the source and add it to the post )

    Specification:

    Product Name varistor
    Model no. 14d681k
    max voltage ac420v, dc560v
    varistor 680V
    Terminal voltage & current (max v / a) 1120v, 50a
    capacity 290pf
    rated Watt 0.6 W
    max energy (2ms) 136j
    Height (approx) 1.8 x 1.1 x 2.1cm / 0.7 "x 0.4" x 0.8 "(L * W * H)
    Pins pitch (approx) 0.65cm / 0.256 "
    pin dia (approx) 0.07cm / 0.027 "
    outer material plastic
    color black
     
  6. 73's de Edd

    73's de Edd

    3,085
    1,302
    Aug 21, 2015
    ..


    Sir itai shi. . . . . . .

    Looks like the electrical specifications are being the same for the newly found replacement unit.
    That original unit just has a surround housing and some dead space around it.
    Just about ALL other units look like the newly referenced unit . . .excepting the Siemens 3RT series which use a housing about about half the thickness of your original unit.

    If no physical -visual-electrical signs of failure why are you having it in suspect ?

    73's de Edd
     
    itai shi likes this.
  7. itai shi

    itai shi

    18
    3
    Apr 22, 2016
    Dear 73's de Edd,
    thanks for your help,

    the photo i uplad before is not mine board,
    this is my board:

    varistor.PNG varistor3.PNG varistor2.PNG

    Sincerely,
    itai.
     

    Attached Files:

  8. 73's de Edd

    73's de Edd

    3,085
    1,302
    Aug 21, 2015
    Your images are not making it . . . .are you using a hosting site ?
     
  9. itai shi

    itai shi

    18
    3
    Apr 22, 2016
    Excuse me 73's de Edd,
    i didnt understand what did you mean by "Your images are not making it . . . .are you using a hosting site ?"

    you cant see the photos?
     
  10. dorke

    dorke

    2,342
    665
    Jun 20, 2015
    Yes that is definitely a defective Varistor.
    The explosion black marks are evident in the last 2 photos.

    That Varistor is a so called "fireproof" type.
    The outer casing minimized the damage to the surrounding components and indeed minimized the fire hazard due to the exploded Varistor.
    What I would do is take it out of the board ,open it very carefully clean the explosion residue well ,
    and replace the inside Varistor with the blue one and re-assemble it back on the board.
     
    Last edited: Apr 23, 2016
    itai shi likes this.
  11. Ian

    Ian Administrator

    1,487
    435
    Aug 23, 2006
    It looks like there were some problems with the server at the time, so I've fixed the problem with attachments and they should appear now :).
     
    itai shi likes this.
  12. itai shi

    itai shi

    18
    3
    Apr 22, 2016
    sound a good idea ,
    i hope the varistor can be taken out of the outer casing.
    will try it in the next two days, and update,
    thanks all for the really big help !!
    (-:
     
  13. itai shi

    itai shi

    18
    3
    Apr 22, 2016
    Dear Dorke,
    you are a genius !!

    the black varistor indeed was a housing box for the original varistor,
    the original one is look same as the replacement.
    i guess the is no polarity for this part , because i dont see any sign for a polarity (e.g. +/-)
    faultyVar.JPG
    i opened the black housing box,
    took out the faulty varistor,
    put a new one inside the black housing box,
    solder the fixed one to the circuit,
    put a new fuse,

    and today im gonna go back, up my roof to put the circuit back in.
    and prey that no more parts got faulty on this circuit board.

    i;ll will update,
    thanks .
    itai.
     
  14. dorke

    dorke

    2,342
    665
    Jun 20, 2015
    My pleasure,
    I would clean that board with a small dry paint-brush an a vacuum-cleaner.
     
    itai shi likes this.
  15. itai shi

    itai shi

    18
    3
    Apr 22, 2016
    final status:

    the air condition work perfect for almost half an hour :)

    (the symptom before the error was that the air condition was shutdown himself after 10 seconds and had a green light flashing fast)

    dorke, 73's de edd and Ian,
    well done everybody !!!
    i really owe you big time !!!!
    :D
     
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