Products > Dodgy Technology

KCD-11 rocker switch from aliexpress is junk

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dusan:
I recently had troubles with KCD-11 switches I bought on aliexpress (https://www.aliexpress.com/item/1005001513148147.html), they had 100s of ohms ON resistance. I don't think I used them much, maybe few hundred times. I dissasembled it and found that the seat have worn spots in nickel plating where the botom of the plate is touching the center pin. I did paid $1/10pcs free shipping so, I don't know what I expected. Rant over.

dusan:
Here's frequency measurement before (yellow) and after switch replacement (cyan)

BrokenYugo:
Yeah definitely don't go too cheap on switches, bad contacts, melty cases, etc.

thm_w:
The thing is some suppliers with the exact same looking part might be great. But yeah these look cheap.

LCSC has some from 10c each that I'd probably trust more: https://www.lcsc.com/product-detail/span-style-background-color-ff0-Rocker-span-Switches_SHOU-HAN-KCD11-2P-R_C5884414.html (hundreds of options just picked the first one).

Kleinstein:
Mechnical contacts can be tricky with small signals. A good low ohm contact may need a certain minimum current to flow.
The switch could well be OK for other uses (e.g. to switch a light or possibly even mains).

The construction looks cheap, with no extra contact material. The problem may not be the worn spot, but possibly just an oxidized or oily contact surface.

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