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I was wondering why there are different symbols for common mode chokes and if/how they affect the way I have to connect them.

Common Mode Choke Types

(Upper image is incorrect but left here for understanding the comment from @Felthry)

Common Mode Choke Types

Most often I see type 1 and there is no doubt on how to use them. But with types 2 and 3 I'm not so sure. They must have different meanings as I saw them simultaneously in one circuit. Can anyone enlighten me or refer me to a decent source on what the difference is?

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  • \$\begingroup\$ That's odd... I'd thought types 2 and 3 were alternatives to the dot notation for showing relative polarity, but if they have dots as well as the core symbols, I suppose it isn't. \$\endgroup\$
    – Hearth
    Nov 19, 2018 at 14:08
  • \$\begingroup\$ @Felthry You are right. I uploaded a new image. So Type 2 and 3 are equal? \$\endgroup\$
    – Peder
    Nov 19, 2018 at 14:29
  • \$\begingroup\$ I think (don't quote me on this) that types 2 and 3 are just a method of showing the relative orientation of the windings. 2 and 3 are not the same, but if you swap the polarity of one of the windings, 2 turns into 3 and vice versa. \$\endgroup\$
    – Hearth
    Nov 19, 2018 at 17:33
  • \$\begingroup\$ Does this answer your question? Inductor Symbol? What does this symbol indicate? \$\endgroup\$
    – Tim Williams
    Apr 3 at 20:47

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