Component abbreviation RV?
SteveD
Posts: 64
Could someone tell me what component is represented by RV?· These letters are printed on a circuit board next to a component that looks similar to a ceramic disk capacitor.
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Thank you,
Steve
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Thank you,
Steve
Comments
maybe, I'm totally wrong as you never know what PCB designers have in mind...
"R" usually stands for "Resistor", and the "V" might stand for "Variable", so this component could be a Varistor, or VDR - they usually look like large ceramic disk-shaped capacitors with wires attached at both sides of the disk. Can you identify what is printed on the component itself?
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Greetings from Germany,
G
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engineer, fireman, bowler, father, WoW addict [noparse];)[/noparse]
I believe I have found that it is a Zinc Oxide Varistor. Are these components (varistors) polarity sensitive? How would one size or select the correct one for use?
I am in need of a suppression device. I am using a packaged snubber (resistor capacitor) across relay contacts and this works however they are big and bulky and I need about 100 of them. I think the varistor would be the way to go because of space and price but I don't know anything about them. Any help would be appreciated.
Thanks for your time,
Steve
now I'm pretty sure that the device in question is a varistor. I googled for SAS-820KD05, found several references but unfortunately no data sheet - maybe you have more luck. Varistors are not polarity sensitive.
One main criterium for selecting a varistor is the varistor voltage - as long as the voltage applied to the varistor is below the varistor voltage, it will behave like a capacitor. When the voltage is above, e.g. caused by a transient, it acts as a resistor, shorting this transient. Another important value is the max. pulse current a varistor can withstand.
Just google for varistor, and you will find a lot of sources with more detailed explanations.
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Greetings from Germany,
G
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