A useful source:
https://worldofsockets.com/
this post was submitted on 29 Jul 2025
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F, C, E, K..... Are they all directly compatible?
They are, but they do have slight differences. For instance, the type E plug is often used in Belgium and France, it has a ground pin just below center. It basically means that you cannot turn the plug upside down, similar to the plug used in the US, which can be very annoying when you are used to plugs F and C, these are grounded in the bezel, allowing the user to plug upside down.
Type E always bugs me when I visit Belgium or France and I do that often. It's like the original USB plug, you always plug it in wrong on first try.
As a Belgian, that type E plug sucks because it's much too easy to misalign the ground pin and then you can push all you like, that plug's not going in.
Type C or F are much easier, luckily they are becoming more common here.
Thanks, great to know!
Are H and J compatible?
Most of the time yes, but the pin in type E will not cause some chargers to be fit
I haven't seen a plug here in Finland, where all sockets are of type F, that would not have a hole for the ground pin of type E in case that I want to travel to France or Belgium and use the device there. Where have you found a device whose plug doesn't fit in type E socket?!
A lot of phone chargers etc that aren't grounded and some are slightly to thick to fit in type E