Ladder logic symbols (IEC 61131-3)
Free symbol library from Deskely: https://deskely.com/resources/ladder-logic-symbols

SVG files, free to use in your own drawings, documents and presentations.

More free symbol libraries and completions and commissioning templates
(ITP, punch list, ITR, test packs, completion certificates and more):
https://deskely.com/resources/templates

Deskely: completions and commissioning software for capital projects, in production since 2014.
