Ceramic capacitors and varistors look very similar, are blue far a small thing, some people are not clear led to the ceramic capacitors and varistors mixed, light function is not normal, heavy burn circuit, although they look like, but the role function is completely different.
Varistor is a kind of resistor with non-linear voltammetric characteristics, mainly used for voltage clamping when the circuit is subjected to overvoltage, absorbing excess current to protect sensitive devices, x2 amperometric capacitors are mainly used to withstand abnormal overvoltage and protect the circuit. And ceramic capacitor is a kind of capacitor made of ceramic material as medium, coated with a layer of metal film on the surface of ceramic, and then sintered at high temperature as electrode, the main role is to be used as capacitor in low frequency circuit for isolation, coupling, bypass and filtering.
Generally in the circuit board varistor position mark, there are: VSR, VDR, RV and other words is varistor, and ceramic capacitor is with ldquo;Crdquo; mark. The color of the varistor is blue, the size is 5D 7D 10D 14D 20D 25D, etc. The surface engraving is XD, then the following 10XK 2XXK 18XK, etc. Those marks indicate the voltage resistance of the varistor, for example, 10D 471K, then this is a varistor, then the diameter is 10mm, the voltage resistance is 470V, the error range is ten percent. The range is ten percent.
The color of ceramic capacitor is also blue, and the appearance is very similar to varistor, but there is no D as the size of the difference, the general printing is directly printed with 10X 1KV 22X 1KV, etc. For example, 102M 400V is printed, which means the capacity of this ceramic capacitor is 102, and the withstand voltage is 400V, and the error range is 20 percent.
Ripple alumiinium elektrolüütkondensaator

Ripple alumiinium elektrolüütkondensaator

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