Blown capacitor. Actually an MOV. - UK Vintage Radio Repair and Restoration Discussion Forum

klugardo · 8th Jan 2022, 6:50 pm

i screwed up and put the wrong breaker in and blew this part on my board.

does anyone know what it is?

the only numbers on the part are in 2 rows

175L20
0150
any help is appreciated

i included a American nickel picture for size reference and the label on the board itself

duncanlowe · 8th Jan 2022, 6:53 pm

Don't think its a capacitor. Looks more like an MOV (Metal Oxide Varistor) or a PTC device.

Station X · 8th Jan 2022, 6:53 pm

What equipment is it from and what's its electrical position in the circuit?

factory · 8th Jan 2022, 6:57 pm

That is not a capacitor, it's a metal oxide varistor.
Looking for a datasheet should give the specification and others might know what the equivalent is if it's obsolete.

David

klugardo · 8th Jan 2022, 7:04 pm

Here is what it says on the board.

markfff · 8th Jan 2022, 7:16 pm

As others have pointed out, it's an MOV
https://docs.rs-online.com/c888/0900766b80785545.pdf

klugardo · 8th Jan 2022, 7:21 pm

ok thats amazing its not a capacitor its a MOV.

with so little information on the MOV.

anyone have an idea how to replace it?

klugardo · 8th Jan 2022, 7:23 pm

its a from the power board assembly

i dont know what you mean position on the circuit sorry.

Station X · 8th Jan 2022, 7:32 pm

Power board assembly of what?

Regardless of that you'll find the component on page 57 of the document linked to in post #6.

klugardo · 8th Jan 2022, 8:42 pm

i looked at that document yes.

there are over 20 different items on that link.

is there a way from the model number on the MOV picture i attached.

to figure out its direct replacement

Station X · 8th Jan 2022, 8:47 pm

Fifth line up from the bottom of the list.

factory · 8th Jan 2022, 8:50 pm

The marking 175L20 is part no. V175LA20A which might be obsolete due to RoHS,
replacement is V175LA20AP (marked P175L20).

David

klugardo · 8th Jan 2022, 8:57 pm

like i have found this part number on the sheet

660L50

and mine is

175L20

anyone know what these numbers stand for before the L and after the L?

klugardo · 8th Jan 2022, 8:58 pm

ill callVaristor Products for sure on monday as it is through guys thanks for putting me on the right track so far

Station X · 8th Jan 2022, 9:09 pm

Quote:

Originally Posted by klugardo

like i have found this part number on the sheet

660L50

and mine is

175L20

anyone know what these numbers stand for before the L and after the L?

660L50 is on page 59. I said page 57.

RMS Voltage and diameter in mm?

klugardo · 8th Jan 2022, 10:21 pm

holly crap graham you got it!!! hell ya!!

so in your opinion this would be the replacement sir?

wow i didnt see it in the list and you found it!!!

this is very cool.

so this exploded.

black all over the casing,

what is a MOV major role in a voltage board?

joebog1 · 8th Jan 2022, 10:41 pm

It suppresses spikes in its fundamental form.

Joe

klugardo · 8th Jan 2022, 10:49 pm

i just watched a video and it says these are a one direction part.

so i will have to know which direction these these were facing to install correctly ?

factory · 9th Jan 2022, 12:58 am

Quote:

Originally Posted by klugardo

holly crap graham you got it!!! hell ya!!

so in your opinion this would be the replacement sir?

wow i didnt see it in the list and you found it!!!

this is very cool.

so this exploded.

black all over the casing,

what is a MOV major role in a voltage board?

You should only fit the same voltage rating & size as the original, i.e. the 175Vrms 20mm part no. V175LA20AP. I don't know where you got the other number from, were there two different ones fitted?

If you were to fit the wrong part of higher voltage, then whatever damaged the original would then damage other parts of the board.
If you fitted a lower voltage one, it would fail under normal use.

What happened anyway, was the device 110V and got accidentally connected to a 220V outlet?

David

klugardo · 9th Jan 2022, 2:34 am

no sir.

what happened was i thought................

i saw it was a 50a unit.

so i wired the breaker box to the unit 50a wire and breaker.

i used the item for 3 hours yesterdsy no issues.

unplugged the unit to finish up installation.

woke up in the morning plugged it in and POP.

smoke

opened it up.

checked the info on the otem again and it says 35a unit?!?!?!?!

so i screwed up and put the wrong equipment in.

im going to call the manufacturer monday and find out what exactly the right breaker is.

now are these things 1 direction instalation?

8th Jan 2022, 6:50 pm	#1
klugardo Triode Join Date: Oct 2020 Location: Lakeland, Florida, USA. Posts: 35	Blown capacitor. Actually an MOV. i screwed up and put the wrong breaker in and blew this part on my board. does anyone know what it is? the only numbers on the part are in 2 rows 175L20 0150 any help is appreciated i included a American nickel picture for size reference and the label on the board itself Attached Thumbnails Last edited by Station X; 8th Jan 2022 at 7:35 pm. Reason: l changed to L to match picture.

8th Jan 2022, 6:53 pm	#2
duncanlowe Nonode Join Date: Jan 2016 Location: Stafford, Staffs. UK. Posts: 2,532	Re: Blown capacitor. Don't think its a capacitor. Looks more like an MOV (Metal Oxide Varistor) or a PTC device.

8th Jan 2022, 6:53 pm	#3
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 21,289	Re: Blown capacitor. What equipment is it from and what's its electrical position in the circuit? __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.

8th Jan 2022, 6:57 pm	#4
factory Octode Join Date: Jul 2009 Location: Cheshire, UK. Posts: 1,738	Re: Blown capacitor. That is not a capacitor, it's a metal oxide varistor. Looking for a datasheet should give the specification and others might know what the equivalent is if it's obsolete. David

8th Jan 2022, 7:04 pm	#5
klugardo Triode Join Date: Oct 2020 Location: Lakeland, Florida, USA. Posts: 35	Re: Blown capacitor. Here is what it says on the board. Attached Thumbnails

8th Jan 2022, 7:16 pm	#6
markfff Tetrode Join Date: Aug 2021 Location: Virginia Beach, Virginia, USA Posts: 79	Re: Blown capacitor. As others have pointed out, it's an MOV https://docs.rs-online.com/c888/0900766b80785545.pdf

8th Jan 2022, 7:21 pm	#7
klugardo Triode Join Date: Oct 2020 Location: Lakeland, Florida, USA. Posts: 35	Re: Blown capacitor. ok thats amazing its not a capacitor its a MOV. with so little information on the MOV. anyone have an idea how to replace it?

8th Jan 2022, 7:23 pm	#8
klugardo Triode Join Date: Oct 2020 Location: Lakeland, Florida, USA. Posts: 35	Re: Blown capacitor. its a from the power board assembly i dont know what you mean position on the circuit sorry.

8th Jan 2022, 7:32 pm	#9
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 21,289	Re: Blown capacitor. Power board assembly of what? Regardless of that you'll find the component on page 57 of the document linked to in post #6. __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.

8th Jan 2022, 8:42 pm	#10
klugardo Triode Join Date: Oct 2020 Location: Lakeland, Florida, USA. Posts: 35	Re: Blown capacitor. i looked at that document yes. there are over 20 different items on that link. is there a way from the model number on the MOV picture i attached. to figure out its direct replacement

8th Jan 2022, 8:47 pm	#11
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 21,289	Re: Blown capacitor. Fifth line up from the bottom of the list. __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.

8th Jan 2022, 8:50 pm	#12
factory Octode Join Date: Jul 2009 Location: Cheshire, UK. Posts: 1,738	Re: Blown capacitor. The marking 175L20 is part no. V175LA20A which might be obsolete due to RoHS, replacement is V175LA20AP (marked P175L20). David

8th Jan 2022, 8:57 pm	#13
klugardo Triode Join Date: Oct 2020 Location: Lakeland, Florida, USA. Posts: 35	Re: Blown capacitor. like i have found this part number on the sheet 660L50 and mine is 175L20 anyone know what these numbers stand for before the L and after the L?

8th Jan 2022, 8:58 pm	#14
klugardo Triode Join Date: Oct 2020 Location: Lakeland, Florida, USA. Posts: 35	Re: Blown capacitor. ill callVaristor Products for sure on monday as it is through guys thanks for putting me on the right track so far

8th Jan 2022, 10:21 pm	#16
klugardo Triode Join Date: Oct 2020 Location: Lakeland, Florida, USA. Posts: 35	Re: Blown capacitor. holly crap graham you got it!!! hell ya!! so in your opinion this would be the replacement sir? wow i didnt see it in the list and you found it!!! this is very cool. so this exploded. black all over the casing, what is a MOV major role in a voltage board?

8th Jan 2022, 10:41 pm	#17
joebog1 Banned Join Date: Jun 2015 Location: Mareeba, North Queensland, Australia Posts: 2,704	Re: Blown capacitor. It suppresses spikes in its fundamental form. Joe

8th Jan 2022, 10:49 pm	#18
klugardo Triode Join Date: Oct 2020 Location: Lakeland, Florida, USA. Posts: 35	Re: Blown capacitor. i just watched a video and it says these are a one direction part. so i will have to know which direction these these were facing to install correctly ?

9th Jan 2022, 2:34 am	#20
klugardo Triode Join Date: Oct 2020 Location: Lakeland, Florida, USA. Posts: 35	Re: Blown capacitor. no sir. what happened was i thought................ i saw it was a 50a unit. so i wired the breaker box to the unit 50a wire and breaker. i used the item for 3 hours yesterdsy no issues. unplugged the unit to finish up installation. woke up in the morning plugged it in and POP. smoke opened it up. checked the info on the otem again and it says 35a unit?!?!?!?! so i screwed up and put the wrong equipment in. im going to call the manufacturer monday and find out what exactly the right breaker is. now are these things 1 direction instalation?