Im currently studying for my NEN3140 exam and I stumbeld acros this image:

Screenshot electronic

I have been poking around in google (and all the symbol questions I could find here) and the closest I got is this (page2):


which makes me this it is a "Switch, general symbol double pole", after googleing som more I can find the top right symbol back as a double pole switch

But I can't find the "key/switch" with 4 bars/poles? back. Is it safe to think this is a 4 pole switch or is it somthing else?

  • \$\begingroup\$ Seems reasonable to me that it is a 4-pole (3-phase + ground) switch, because it is preceded by a triple fuse. \$\endgroup\$ – Wouter van Ooijen Apr 5 '18 at 8:44
  • \$\begingroup\$ The one with two bars comes out of the IEC 60617 it seems, but I can't find the one you are looking for, but I don't have the original document available, so it might be in there. \$\endgroup\$ – Arsenal Apr 5 '18 at 8:48
  • \$\begingroup\$ @WoutervanOoijen You mean 3-phase + neutral, you would never switch a ground wire! \$\endgroup\$ – Finbarr Apr 5 '18 at 8:54
  • \$\begingroup\$ Sorry, I am an low-current/voltage guy, for me ground, mass, neutral are all the same, but I know they are different in high-power stuff. But I can't edit a comment.... \$\endgroup\$ – Wouter van Ooijen Apr 5 '18 at 9:10
  • 2
    \$\begingroup\$ Safely? As in betting your life on an educated guess from an non-power-electronics guy?? No way. But I'd call it a reasonable guess. \$\endgroup\$ – Wouter van Ooijen Apr 5 '18 at 9:19

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