How to read varistor code

Then, you start having issues with high voltage surges.

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How to read varistor code

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The MOV can be a rated at V. Re: What is a Varistor?

A varistor is a device with a non-linear volt-ampere characteristic. It is mainly used to clamp the voltage when the circuit is subjected to overvoltage and absorb excess current to protect sensitive devices. The material of the resistor body of a varistor is a semiconductor , so it is a variety of semiconductor resistors. The "zinc oxide" ZnO varistor, which is now widely used, has the main material composed of the divalent element zinc Zn and the hexavalent element oxygen O. So from the perspective of materials, the zinc oxide varistor is a kind of "II-VI oxide semiconductor". A varistor.

Unlike the fuse or circuit breaker which offers over-current protection, the varistor provides over-voltage protection by means of voltage-clamping in a similar way to the zener diode. But unlike a variable resistor whose resistance value can be manually varied between its minimum and maximum values, the varistor changes its resistance value automatically with the change in voltage across it making it a voltage-dependant, non-linear resistor or VDR for short. Nowadays the resistive body of a varistor is made from semiconductor material making it a type of semiconductor resistor with a non-ohmic symmetrical voltage and current characteristics suitable for both AC and DC voltage applications. In many ways the varistor looks similar in size and design to a capacitor and is often confused as being one. However, a capacitor cannot suppress voltage surges in the same way a varistor can. When a high voltage surge is applied to a circuit, the outcome is usually catastrophic to the circuit, therefore the varistor plays an important role in the protection of delicate electronic circuits from switching spikes and over voltage transients.

How to read varistor code

The small package of resistance, the resistor is used in so many circuits, in so many forms, that it is almost an omnipresent electric component. From the very basic fixed resistors, where the resistance remains unchanged, to different types of variable resistors, whose resistances change according to different factors. The variable resistors are of different types; there are ones in which the effective length of the resistive strip plays role in changing the resistors like the potentiometers and rheostats and then there are other set of variable resistors where a manual change in resistance is not possible, rather they are sensitive to physical factors such as temperature, voltage, magnetic field etc.

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Home - Blog. I assume this is not a "good thing" and plan to replace them, but with what? V a Where: I — current V — voltage a — degree of nonlinearity Varistor Types The major types of varistors available include: 1. File Upload. Skip to main content Skip to primary sidebar Search this website. Varistors are used to protect a circuit from high voltage surges. The airco unit is automatic fused at 35amps. Siong Boon. So the 1mA DCV rating is important to match. Current rating of one amp? The most common varistor is a metal oxide varistor MOV , which contains a ceramic block composed of zinc oxide particles and a small number of other metal oxides or polymers, sandwiched between two metal sheets. The varistor is similar to the diode because of its nonlinear, non-ohmic current-voltage feature. Wire-wound resistors are generally used for high current limiting, and the resistance is not large. A V load will probably be able to tolerate up to V.

Then, you start having issues with high voltage surges.

It comprises silicon carbide. Status Not open for further replies. Due to the large current, the varistor will overheat and burn or even burst over time. Contact us. JPG Thank you everyone for your guidance. Are you unfamiliar with the term? What is a variable capacitor? But, how can uderstand current rating of a MOV…..? That way, the device can disconnect if overheating occurs. Silicon carbide varistor—a variant that dominated the markets before MOVs came along.