Surge protector designed to die after date of expiration is reached - Page 1
Forum section: electronics / repair

author: indigoboy
author_rank: Newbie
timestamp: December 01, 2015, 03:32:29 pm
content: First of all - a big HI to everybody, I'm brand new here.The question is - has anyone heard of this? I believe that might be the cause of failure of my Belkin Conserve Switch.https://www.belkin.com/conserve/switch/This surge protector has 2 always-on outlets, and 6 outlets controlled by a remote. I have it for a few years now, and recently the remote controlled outlets stopped working. I decided to take a peek inside and I found that one of the two thermal fuses was blown. While looking for a replacement on the internet, I've stumbled upon a brochure for Belkin surge protectors:http://www.belkin.com/sg/pressroom/brochures/uploads/sg/Your%20Guide%20to%20Surge%20Protection.pdfFirst page, on the left, it says:Safety Shutdown TechnologyUses thermal fuses to power off your system, which saves all connected devices in the event of a severe occurrence, orwhen surge protection expires.So, thermal fuses are designed to break after reaching expiration date? I haven't found much info on this while googling around. What do you think?I would like to still use this device, even if not for it's surge protection, then at least for the remote controlled outlets.By the way, how can I find a proper replacement for the blown fuse? I can't find any info about it, here's some photos of it:

author: krivx
author_rank: Frequent Contributor
timestamp: December 01, 2015, 03:38:41 pm
content: I think they are using "expires" to mean "die" or "fail", not necessarily that these are timebomb components. How could they even reliably achieve that?

author: Seekonk
author_rank: Super Contributor
timestamp: December 01, 2015, 04:09:30 pm
content: Even food is still good way after the expiration date1 You are being far too paranoid. You can put just about any fuse in it as long as it is the same current, at least the same voltage and will fit in. UL requires fuses because these items may short out from a large enough surge. These ca last for ever if they are not stressed.

author: max666
author_rank: Frequent Contributor
timestamp: December 01, 2015, 04:31:48 pm
content: Quote from: indigoboy on December 01, 2015, 03:32:29 pmWelcome to the forumBut this is not a fuse. It's a Gas Filled Surge Arresterhttp://www.vetco.net/catalog/product_info.php?products_id=2189

author: ciccio
author_rank: Frequent Contributor
timestamp: December 01, 2015, 04:53:35 pm
content: Welcome to the forumBut this is not a fuse. It's a Gas Filled Surge Arresterhttp://www.vetco.net/catalog/product_info.php?products_id=2189True, and if you solder a fuse in place of it, it will short line or neutral to protective earth, so it will blow in milliseconds (if connected to line). Real danger...Best regards

author: indigoboy
author_rank: Newbie
timestamp: December 01, 2015, 05:28:34 pm
content: Thank you guys for very quick replies. I guess I still have a lot to learn before I fix this... Cheers!

author: SeanB
author_rank: Super Contributor
timestamp: December 01, 2015, 06:00:50 pm
content: The remote outputs not working is probably a failed capacitive dropper power supply. Photos, decent quality and resolution, of top and bottom of the remote board would help to show you what is likely faulty.

author: Richard Crowley
author_rank: Super Contributor
timestamp: December 01, 2015, 06:20:20 pm
content: "Surge protection" is mostly marketing hype. They can take a $2 power strip, add a couple of 50-cent marginally-specified devices, and charge $15. As others have said, that flat round ceramic thing is a gas-filled "spark-gap" kind of device which theoretically "shorts" severe over-voltage to ground. They don't have "expiration dates" or "life-cycle periods". But many (most?) kinds used in cheap power strips are the kind that take the hit once, and then are finished. They offer no additional protection. Of course, you don't know when they die, either because there are typically no external symptoms. You are just left "unprotected". But you weren't really "protected" before in any meaningful way, so you aren't really at any significantly increased risk. But knowing that you over-paid for a cheap plastic power strip gave you some (imaginary) peace of mind.

author: indigoboy
author_rank: Newbie
timestamp: December 01, 2015, 08:28:21 pm
content: Quote from: SeanB on December 01, 2015, 06:00:50 pmI've uploaded some photos here:http://expirebox.com/download/f13397e5a8c49042c2429c5b87699923.html(link expires in 48h)

author: macboy
author_rank: Super Contributor
timestamp: December 02, 2015, 02:09:02 pm
content: The surge protection devices employed are usually MOVs. These will conduct when the voltage across their terminals exceeds some rated voltage. This effectively shorts out the spike before it appears at the equipment. MOVs have a limited life, not in terms of months or years, but in terms of the amount of energy that they can absorb over their lifetime. You can independently research all about how they work and why they have limited life, but I'll just point out that as they die, their conducting voltage becomes less and less, until finally, they begin to conduct at line voltage. Not fully conduct, not enough to trip a circuit breaker, but just a little and plenty enough to get hot enough to start a fire. You can imagine how bad that would be if there was not a thermal fuse in there to break the circuit and keep your house from burning down.