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.
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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.
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\$\begingroup\$ From that list, it looks more like their VDR symbol \$\endgroup\$– PlasmaHHNov 12, 2015 at 15:45
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\$\begingroup\$ @PlasmaHH Yes. Sorry, is a Metal Oxide Varistor! \$\endgroup\$ Nov 12, 2015 at 15:46
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\$\begingroup\$ @DavidE. If this is the correct answer, please mark it for future references. \$\endgroup\$ Nov 12, 2015 at 16:02
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\$\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