00:00If you're building anything that plugs into a wall, you already know one bad spike can turn
00:04a working project into a paperweight. So I went hunting for the best deals on top 5 14mm
00:10varistors for mains surge clamping, and honestly, the prices are a little silly.
00:15Mains voltage is no joke though, so fuse things properly and treat this as shopping advice,
00:20not safety engineering. Here we go.
00:23Number 1 is this 5-pack of S14K275S for $4.21.
00:30Yes, the listing title is word salad, mine says power relay, and it absolutely is not a relay,
00:35but the part itself is exactly what you'd expect, a 14mm disc, 275V RMS continuous,
00:42around 4,500A of surge current handling. That's roughly 84 cents each, and with over 4,500 sold
00:49at 4.6 stars, people clearly aren't upset. Perfect if you're buying your first batch
00:55and don't want to overthink it. Number 2 is the one I'd grab when I want
00:59the specs spelled out, the original B7-2214S271K101, listed plainly as 275V, 4,500A, 14mm,
01:09through-hole plug-in. It's $3.61, and it's the most boring, most verifiable option on this list.
01:17When you're clamping mains, boring is a feature. A 4.5-star average across 4,000-plus sales tells you
01:24it isn't some one-off mystery batch. Number 3 is the price winner at $1.68, and it's holding a
01:31perfect 5-star rating over more than 4,000 sales, which is genuinely rare on these listings.
01:36One honest flag, the title says 300VC while the part number is AK275, so check that against your
01:43own numbers before you commit, it's most likely the max continuous rating, but verify.
01:48Same 14mm family, same job, cheapest entry point here. Great for prototyping on a budget.
01:56Number 4 is the bulk buy, 20 pieces for $5.40, which works out to $0.27 each.
02:03That's the number that actually matters if you're building more than one board.
02:08Same S14K275 part, 4.8 stars, over 3,000 sold.
02:13If you're doing a small run, or you just know you'll sacrifice a couple while learning,
02:17this is the lot to order instead of rebuying singles every two weeks.
02:21Number 5 is the premium pick, 10 brand-new Epcos parts in the B7-2214 series for $8.82,
02:28so about $0.88 each.
02:30This is the genuine branded disc, 4.8 stars, 3,100-plus sold.
02:36The listing calls it a metallic oxide capacitor, which is the wrong name, it's a metal oxide
02:41varistor, but the part number lines up.
02:44Buy this one when you want to know exactly whose factory it came out of.
02:49Everything's linked in the description below, in the order I covered them.
02:53If this saved you an hour of scrolling through junk listings, drop a like and hit subscribe,
02:58it genuinely helps.
02:59See you in the next one.
