Need a new fuse for my ANENG AN870  (I'm in the UK) - Page 1
Forum section: electronics / testgear

author: HobGoblyn
author_rank: Unknown
timestamp: February 03, 2020, 06:36:42 pm
content: Hi all, I need a new 200mA 250v fuse after being stupid (I'm new to electronics)It appears to be a ceramic fuse, 30mm long and says F200maL 250vI can find 20mm ones or 30mm glass ones, but not 30mm ceramicAny advice greatly receivedThanks

author: AVGresponding
author_rank: Super Contributor
timestamp: February 03, 2020, 06:43:42 pm
content: Is it one of these?https://www.mouser.co.uk/ProductDetail/Altech/02M5X30M?qs=8a0hyeKx4nUPOEuh279GNA%3D%3D

author: HobGoblyn
author_rank: Unknown
timestamp: February 03, 2020, 07:03:26 pm
content: Quote from: ThickPhilM on February 03, 2020, 06:43:42 pmThanks, that would do fine, only problem is that with delivery, it works out at £14.14 for 1 fuse

author: AVGresponding
author_rank: Super Contributor
timestamp: February 03, 2020, 07:06:45 pm
content: You get free shipping with these guys at £33 and over (ex vat), I always wait until I find enough stuff to reach the target.IIRC RS have a £20 limit for free shipping, and they'll certainly have them too I should think.EDIT: Had a quick look, and surprisingly RS don't have 'em... just glass ones in that size, which have a lower breaking capacity. Same for the other suppliers I have bookmarked... clearly there's a good reason Mouser are at the top of my list!Quite a few 1/4" x 1 1/4" (6 x 32mm) are available, this might be worth considering if the fuseholder will accept these without undue stress.

author: Trader
author_rank: Frequent Contributor
timestamp: February 04, 2020, 08:45:26 pm
content: Buy directly from Aneng, both 0.2A and 10A (they also have 20A)Ceramic fuse tube 5X20mm 10*200hA + 10*10Ahttps://www.aliexpress.com/item/4000563807136.html

author: Monkeh
author_rank: Super Contributor
timestamp: February 04, 2020, 10:31:06 pm
content: Quote from: Trader on February 04, 2020, 08:45:26 pmThat's.. the wrong size fuse.. And they're unlikely to ship any time soon.

author: tooki
author_rank: Super Contributor
timestamp: February 05, 2020, 07:13:46 pm
content: Quote from: HobGoblyn on February 03, 2020, 06:36:42 pmAre you absolutely, 100% sure it’s just 5mm diameter? Aneng’s own AliExpress shop lists 6x30mm fuses, and my hunch is that the design is probably for 6.3x32mm, which is a standard fuse size that is widely available, including as purpose-made multimeter fuses. 6.0x30mm is well within the tolerances of a fuse holder made for 6.3x32mm (and vice versa).Here’s the Aneng product link:https://www.aliexpress.com/item/4000563760641.html

author: tooki
author_rank: Super Contributor
timestamp: February 05, 2020, 07:31:39 pm
content: And while it’s much more expensive than the Aneng part, here’s a compatible fuse from a reputable european reseller:https://www.reichelt.com/gb/en/fuse-6x32mm-600v-200ma-f-ut-f04-p239075.htmlThough if it were me, I’d probably just get the much cheaper 250mA version, since the extra 200mA are unlikely to make any difference whatsoever:https://www.reichelt.com/gb/en/fuse-6-3-x-32-mm-1000-v-0-25-a-ar-ff-mms-p7600-p142812.html

author: HobGoblyn
author_rank: Unknown
timestamp: February 05, 2020, 09:04:32 pm
content: Quote from: tooki on February 05, 2020, 07:13:46 pmNo. It's 6mm x 30mm

author: tooki
author_rank: Super Contributor
timestamp: February 05, 2020, 11:53:53 pm
content: OK, perfect. I think if I were you, I'd order the pack of fuses from Aneng from China, and if you need to use the meter before they arrive, buy a regular glass fuse locally to use (on low-energy circuits only!) until the ceramic fuses arrive, or if you really need a ceramic fuse immediately, then order a single one from a western vendor. I'd still order the Chinese ones to keep around.

author: Fungus
author_rank: Super Contributor
timestamp: February 06, 2020, 05:29:55 pm
content: Quote from: tooki on February 05, 2020, 11:53:53 pmWould you really use this meter on high energy circuits?The meter has spring clips, probably any size that's close will do.And if it's 250mA instead of 200mA, not really a problem. Anything that will blow a 200mA fuse will blow a 250mA fuse almost as easily.

author: tooki
author_rank: Super Contributor
timestamp: February 06, 2020, 11:07:30 pm
content: Quote from: Fungus on February 06, 2020, 05:29:55 pmWith a proper DMM fuse installed, only as “high” as a household AC outlet, and then only briefly because for some reason none of my Fluke or Keysight DMMs was around. :p (Not to diss Aneng in any way, I have an AN8008 and like it a lot, I just respect what it is and isn’t.)Quote from: Fungus on February 06, 2020, 05:29:55 pmCool, thanks for confirming my hunches on those two points!

author: Fungus
author_rank: Super Contributor
timestamp: February 07, 2020, 10:38:53 am
content: Quote from: tooki on February 06, 2020, 11:07:30 pmIf the leads are in the voltage socket then the fuse isn't part of the circuit. The fuse is only there for when you get that part wrong.(which you would never do because you engage brain and triple check, right?)Quote from: Fungus on February 06, 2020, 05:29:55 pmIf brain isn't engaged when you use a multimeter on power circuits then having a 200mA vs. a 250mA fuse won't make a lot of difference.

author: tooki
author_rank: Super Contributor
timestamp: February 07, 2020, 01:02:16 pm
content: You can stop it with the patronizing wording, OK, Fungus? I don’t know why you’re being argumentative.Yes, I know the fuses are only for current measurements. But the fuses aren’t there for when everything goes right. The fuses are there for when you make a mistake, and even with the brain engaged and triple checked*, mistakes happen in the real world. So does the unexpected.*for example, if you’ve triple checked the connections, but a fault has caused something to become energized that shouldn’t be, and you don’t know this because, well, you’re still trying to track down why the thing isn’t working... Or you misread a blurry schematic, so you triple check and it’s still wrong.

author: Fungus
author_rank: Super Contributor
timestamp: February 07, 2020, 03:15:25 pm
content: Quote from: tooki on February 07, 2020, 01:02:16 pmIf you're sticking the probes in something that could be energized and the leads/switch on the meter are on "Amps" then you're doing it wrong.If you work on that sort of circuit regularly then get a meter without amps or take the fuses out of the meter before you start work.Quote from: tooki on February 07, 2020, 01:02:16 pmI'm not. I'm talking to the world in general, including the newbies who just found this thread after they searched for "ANENG 870 Fuse" and I don't want anybody to misunderstand the point being made. If that makes me sound like an idiot, then...

author: AVGresponding
author_rank: Super Contributor
timestamp: February 07, 2020, 03:29:13 pm
content: Looking at your pics, that's a 1/4" x 1 1/4" fuse; the diameter is indicated as 6.30mm on that micrometer, and the length is less important. The way they are manufactured means they are often shorter than the spec, due to the end caps being press fitted with the fuse wire itself being folded over the end of the ceramic tube and therefore trapped between the cap and tube. The 1 1/4" or 32mm is a maximum. The critical physical measurement is the diameter.I'd look for a 1/4" x 1 1/4" or 6.3 x 32mm fuse, using a 6mm diameter one in a 6.3mm holder will likely cause a bad contact.

author: tooki
author_rank: Super Contributor
timestamp: February 08, 2020, 05:11:27 pm
content: Quote from: Fungus on February 07, 2020, 03:15:25 pmYour intent may be well-meaning, but you're not adding anything helpful here. You're just being argumentative. I didn't say you sound like an idiot. I said you are being argumentative and patronizing.Quote from: Fungus on February 07, 2020, 03:15:25 pmI think you're just being argumentative again. (And all this argument because I suggested NOT using the meter on high-energy circuits when not equipped with the correct fuse...)My point is this: one can doeverythingright and still encounter something unexpected. Why? Because mistakes happen, and it might not beyourmistake. Or anyone's mistake, in the case of a fault that wasn't caused by human error.Quote from: Fungus on February 07, 2020, 03:15:25 pmAnd if the troubleshooting of said device requires you to measure current, how exactly would you do that on a meter castrated that way? (Not everything can be done with a clamp.)

author: Fungus
author_rank: Super Contributor
timestamp: February 08, 2020, 06:07:56 pm
content: Quote from: tooki on February 08, 2020, 05:11:27 pmNope. I honestly believe that there's a better way to do that job.Whatever your beliefs, I think I can state that if anybody is trying to use a multimeter in a way where a slightly "wrong" 200mA-range-fuse could make a difference in personal safety then they need to pack up their meter and head home.(eg. 250mA instead of 200mA, as was being discussed here)Quote from: tooki on February 08, 2020, 05:11:27 pmI dunno. Give us a concrete example of such a measurement and we can discuss it.

author: tooki
author_rank: Super Contributor
timestamp: February 08, 2020, 06:25:39 pm
content: Quote from: Fungus on February 08, 2020, 06:07:56 pmUh, no, the issue at hand wasn't 250mA vs 200mA, but rather plain glass fuse vs. ceramic DMM fuse. My exact words:Quote from: tooki on February 05, 2020, 11:53:53 pmI only mentioned 250 vs 200mA to say that the 50mA difference doesn't matter, which you agreed with.I never, ever claimed that the glass fuse was equivalent to a ceramic DMM fuse. (On the contrary, this was literally the whole point of my warning.) There damned well is a huge difference in how those behave regarding personal safety!!Quote from: Fungus on February 08, 2020, 06:07:56 pmNah, not indulging your argument-for-sport.

author: HobGoblyn
author_rank: Unknown
timestamp: February 09, 2020, 12:24:38 pm
content: Reading the last few posts, If you’re interested in how I blew the fusehttps://www.eevblog.com/forum/beginners/getting-confused-with-the-basics-and-using-my-power-supply/