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I have a cable that I cannot match with any device. My question is whether this is a standard cable, or rather a proprietary invention.

On one side there is a standard USB Type A male connector.

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The other side is the one I cannot recognize. It looks like an electrical connector (230V, Europe, often used to connect some "mobile radios" (usually also powered by batteries)), such as this one: https://i.stack.imgur.com/UZSez.jpg. It is smaller, enforces polarity, and is obviously not for 230V.

(the scale on the images below is in centimeters)

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Looks like a Philips shaver USB charging cable. So it is a proprietary cable.

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    \$\begingroup\$ Do those have some sort of excessively clever power input circuit which can accept both 5 VDC and 220 VAC over the same two contacts? \$\endgroup\$ Sep 7, 2020 at 15:58
  • \$\begingroup\$ @ChrisStratton no, nothing excessively clever. They use a wall wart, so there won't be 220 VAC anyway over that plug, but smaller isolated DC voltage. \$\endgroup\$
    – Justme
    Sep 7, 2020 at 16:02
  • \$\begingroup\$ It looks like there's a non-standard groove on this which would hopefully make it impossible to plug earlier earlier grooveless Phillips/Norelco direct mains cords into the DC input product. But it's not clear what would prevent a standard double-groove mains cord from fitting. Even a slight difference in spacing and different grooving seems very risky as someone may say "oh, I'll make that fit" and grab a pocket knife. They really should have changed their case mouldings when they changed input voltage; they change them now and then anyway for aesthetic design reasons. \$\endgroup\$ Sep 7, 2020 at 16:05
  • \$\begingroup\$ You are correct however that overall it is smaller. The picture seems to show 11 mm as the width, I measure 14mm for the older shave mains cord, and a standard mains cord is a bit wider still. It still makes me uncomfortable and feels like they did a "lazy" change rather than a good one (and at the cost of having a likely custom connector made!)... Isn't there a European e-waste avoidance directive requiring USB charging cords to use standard connectors for interchangeability? Not that those are the most robust thing for non-USB power applications anyway. \$\endgroup\$ Sep 7, 2020 at 16:19
  • \$\begingroup\$ @ChrisStratton: the universal charger law (still in preparation) would be for mobile phone chargers. Other chargers are not impacted, unfortunately. \$\endgroup\$
    – WoJ
    Sep 7, 2020 at 17:53

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