Help finding replacement MOV - Page 1
Forum section: electronics / repair

author: bhorobec
author_rank: Contributor
timestamp: August 08, 2014, 09:38:52 pm
content: A while ago, we had a bit of a power surge which caused the ice maker in our fridge to die. I've traced it back to the controller board in the ice maker which has a blown mov as well as the trace from the hot line to the primary side of the transformer/mov. I believe the transformer is fine, because I can read ~50 ohms across the primary, which leads me to believe that the mov and damaged track on the board are the only damaged parts. Could anyone help he find a suitable replacement mov for this board? I know very little about these, and don't want to accidentally put in the wrong part.Some info on the blown mov:SVR14D 271KUSEC CAnd there is a silkscreen label beside it that says 650N/651NI've tried searching for these, but can't really find anything, and don't really know much about these devices anyway.I'll also attach some photos of the board.Also, I live in Canada, the mains here is 120V.Thanks in advance.

author: bhorobec
author_rank: Contributor
timestamp: August 08, 2014, 11:45:17 pm
content: Would either of these be suitable replacements?http://www.digikey.ca/product-detail/en/MOV-14D271K/MOV-14D271K-ND/2799115http://www.digikey.ca/product-detail/en/ERZ-V14D271/P7220-ND/137383After some research, I found that 14D refers to the diameter, and the 271 specifies a 270V breakdown voltage. Not sure about the "KU".I'm just not sure if there is any other spec that is important in selecting a replacement.

author: wagon
author_rank: Frequent Contributor
timestamp: August 09, 2014, 10:16:52 am
content: Quote from: bhorobec on August 08, 2014, 11:45:17 pmI'd use those as replacements, no troubles. As long as it has the same voltage rating and is at least the same diameter/thickness, it will do the job.

author: lowimpedance
author_rank: Super Contributor
timestamp: August 09, 2014, 10:39:35 am
content: One other point to note would be the track was most likely sized to be a fuse in the event that the MOV went short and so would not catch fire. Perhaps a suitable piece of fuse wire to fix (replace!) the track would be a good idea.

author: bhorobec
author_rank: Contributor
timestamp: August 09, 2014, 06:44:51 pm
content: Quote from: wagon on August 09, 2014, 10:16:52 amThanks. I've went ahead and ordered the Panasonic one.Quote from: lowimpedance on August 09, 2014, 10:39:35 amI figured that thin track had to be a sort of fuse. I initially thought of using a piece of 30 AWG wire wrapping wire to fix it, but I think I'll use the wire from a 3A glass fuse instead (should be close enough to the original current limit of the 30 mil track).

author: wagon
author_rank: Frequent Contributor
timestamp: August 10, 2014, 05:16:43 am
content: If you need to add a fuse you could drill a couple of little holes in the pcb and use one of the wire-ended fuses that are common nowadays.... or add an external holder (with appropriate insulation, etc.).

author: bhorobec
author_rank: Contributor
timestamp: August 13, 2014, 03:11:00 am
content: Quote from: wagon on August 10, 2014, 05:16:43 amThat's a good idea, but I didn't have anything like that on hand and didn't want to order more parts. I just broke open a 3A glass fuse and used the fuse wire to bridge the burnt trace. Just got it fixed and it seems to be working great. Thanks for the help!

author: wagon
author_rank: Frequent Contributor
timestamp: August 13, 2014, 09:40:06 am
content: Quote from: bhorobec on August 13, 2014, 03:11:00 amGlad to help!