search for a Varistor replacement compatibility

[itai shi]

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

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

thanks in advanced,
itai.

 

[dorke]

Welcome to EP.
From what equipment have you pulled it out?

 

[itai shi]

hi dorke,
thanks for your help,

i need to fix my air condition outside unit circuit,

this type of circuit is: KFR90GW / I1Y

 

[dorke]

Probably a Chinese part.
The black one is much larger ,where did you get it's specs , can you post a link to it?

 

[itai shi]

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

 

[73's de Edd]

..


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]

Dear 73's de Edd,
thanks for your help,

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



Sincerely,
itai.

 

[73's de Edd]

Your images are not making it . . . .are you using a hosting site ?

 

[itai shi]

Your images are not making it . . . .are you using a hosting site ?

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?

 

[dorke]

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.

 

[Ian]

Your images are not making it . . . .are you using a hosting site ?

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]

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.

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 !!
(-:

 

[itai shi]

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. +/-)

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.

 

[dorke]

My pleasure,
I would clean that board with a small dry paint-brush an a vacuum-cleaner.

 

[itai shi]

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 !!!!