Does anyone know what the "Z" lying down symbol is that is in parallel with the normally closed relay contact CRB? I have searched several electrical symbol sites but no luck. The circuit is controlling 24 Vdc power for a motor brake. There is a back EMF arc when this contact opens so the symbol could represent a snubber which in this case may have failed. It will be this weekend before I can physically go in and look for this device. One other bit of info, this machine was built in Japan about 30 years ago.enter image description here


1 Answer 1


I think that is a metal oxide varistor (MOV) or another TVS (Transient Voltage Supressor). Look at this symbol table.
The MOV symbol is near the middle of the table, with an image.

enter image description here

  • \$\begingroup\$ From that list, it looks more like their VDR symbol \$\endgroup\$
    – PlasmaHH
    Nov 12, 2015 at 15:45
  • \$\begingroup\$ @PlasmaHH Yes. Sorry, is a Metal Oxide Varistor! \$\endgroup\$ Nov 12, 2015 at 15:46
  • \$\begingroup\$ @DavidE. If this is the correct answer, please mark it for future references. \$\endgroup\$ Nov 12, 2015 at 16:02
  • \$\begingroup\$ @Martin Petrei. I do not know how to do that. Is that an action that I can perform in this forum? I will try to search that. \$\endgroup\$
    – David E.
    Nov 12, 2015 at 16:32

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