I found this symbol in a vendor circuit diagram. What does it mean? It looks like they are trying to convey some sort of limiting.
It's a resistor symbol with a line over the top that has both the top and bottom ends flattened.
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3\$\begingroup\$ It appears to be a varistor (voltage-dependent resistor). Not sure if a duplicate, so I'm posting this as a comment. \$\endgroup\$– nanofaradCommented Jul 17, 2015 at 17:35
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\$\begingroup\$ It is indeed the IEEE symbol for a Varistor. The IEC symbol is a square box with the same line through it. Source: electronicshub.org/varistor \$\endgroup\$– Tom CarpenterCommented Jul 17, 2015 at 17:38
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1\$\begingroup\$ @AbhishekTyagi No, a variable resistor has a different symbol - it is a diagonal line with an arrow on the end, not what is shown in the drawing above. The symbol shown is a varistor as 3 of us have pointed out (see the link I posted). \$\endgroup\$– Tom CarpenterCommented Jul 17, 2015 at 18:09
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\$\begingroup\$ @TomCarpenter Thanks a lot for pointing this out...its a big mistake i did here....having cold ...;) \$\endgroup\$– Abhishek TyagiCommented Jul 17, 2015 at 18:28
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\$\begingroup\$ V.D.R. (Voltage dependent resistor) \$\endgroup\$– user107801Commented Jul 1, 2016 at 18:55
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3 Answers
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Doing a google search of "Resistor Symbol" and then looking at images, I came across this.
http://www.electroniq.net/electronic-tutorials/resistor-types-symbols-parameters.html
According to the site, its a varistor tolerated symbol.
a: resistor , general symbol
b: resistor , tolerated symbol
c: resistor , un-standard symbol
d: resistor with variable resistance
e: resistor with mobile contact
f: resistor with mobile contact and stop position
g: potentiometer with mobile contact
h: potentiometer with mobile contact, general symbol
i: potentiometer with preset adjustment
j: two plugs resistor
k: shunt resistor
l: thermal resistor
m: thermistor general symbol
n: thermistor tolerated symbol
o: varistor general symbol
p: varistor tolerated symbol
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\$\begingroup\$ I'd seen c) used for memristors (perhaps erroneously.) \$\endgroup\$– rdtscCommented Jul 17, 2015 at 22:07
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\$\begingroup\$ I have seen c) used for resistive heaters. \$\endgroup\$ Commented Jul 18, 2015 at 5:27
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It is better to use oficial symbols and not whatever gather from web.
Official Varistor symbol according to the IEEE "Graphic Symbols for Electrical and Electronics Diagrams" (IEEE std 315-1975) is the follow:
Please refere to the follow standards if you want to communicate and distribute your diagram
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It is a varistor , a voltage dependent resistor
