How to read varistor code

MOVs or metal oxide varistors are devices designed how to read varistor code controlling mains switch ON surges in electrical and electronic circuits. Selecting an MOV for a particular electronic circuit might require some consideration and calculation, let's learn the procedures here. Metal oxide varistors or simply varistors are non-linear surge suppressor devices which are used for suppressing sudden, high abnormal voltage transients or surges, especially during echocardiography poster switch ON or thunder lightening situations.

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How to read varistor code

Welcome, Guest. Please login or register. Did you miss your activation email? This topic This board Entire forum Google Bing. Print Search. Pages: [ 1 ] Go Down. Author Topic: Old varistor code interpretation Read times. RickEev Newbie Posts: 5 Country:. See photo. I assume this is not a "good thing" and plan to replace them, but with what? The Marcon part numbers are close to the current varistor codes, but they have their differences. I assume A is some multiple of 1. I assume DC, since that is what is used in the circuit. The real question is why they went bad. They are suppose to protect for surges but I don't know if they were protecting anything or just got cranky in their old age.

I tried posting this in the repair section but got no traffic on it except for a suggestion to check the oil caps. I don't see any other burnt components. Click here to register now.

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".

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

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.

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Popular Posts. How do I stop this? Metal oxide varistors are currently the most common voltage clamping devices and can be used for various voltages and currents. The excessive voltage is pulled low so that the subsequent circuit works within the safe voltage range. Thank you everyone for your guidance. Welcome to EDAboard. The clamping voltage of the varistor must be less than the maximum voltage ie, safe voltage that the component or equipment being protected can withstand. A rheostat is a device that can adjust the size of the resistance and can be connected to the circuit to adjust the size of the current. Thank you Ze Aman, If your conactor is burning then it means it is not sufficiently rated. The varistor is mainly used for transient overvoltage protection in a circuit, but because of its volt-ampere characteristics similar to a semiconductor Zener, it also has a variety of circuit element functions. But this one is widely used and sustained under common standards. You should slowly adjust the voltage and will observe that the voltage suddenly drops after reaching a certain voltage. SMF 2.

Then, you start having issues with high voltage surges. But the good news is: the varistor is the perfect electrical component for the job.

How do I size my MOV to act as a lightening arrestor on a sprinkler system? Can you help me out here? For high-frequency transmission signals, the capacitance Cp should be smaller, and vice versa. Re: What is a Varistor? Sir, how to prosecute it. Products Products Blog Components. I would like to add, that if you have ANY other loads, like washing machines, refrigerators etc, they will be chipping away at your MOV slowly until it fails without EVER having to have dealt with a lightning strike. Thank you Aries, The information you have added are really useful, I hope the readers will find them helpful. The VDR name is because the device helps to protect electronic devices from overvoltage transients. These materials are adequate for displaying directional behavior at a microscopic scale.