Varistors are made up of two words: variable and resistors that amplify the current and safeguard the appliances from getting fused or heat up because of all the faults that can occur at any moment. The equipment in every field is very expensive and needs absolute protection to extend the device’s lives so that people can enjoy an uninterrupted performance.
The maximum voltage
The varistors are nothing but a very small device that can measure around 0.6 inches × 0.12 inches. They are directly installed in the middle of the circuit or power supply rails. Their voltage differs for both AC and DC devices, and getting one as per the device requirements becomes a little important because if the voltage increases more than 15%, the varistor can be easily damaged. Their maximum voltage can vary from 240V, 330V, and 470V. The buyers should buy one that is either equal to or exceeds slightly than the operating voltage.
The clamping voltage and current
Like the operating voltage, the varistors have their own clamping voltage, which can be as high as 775V or low as 395V. A varistor with a lower capacity to take the voltage as required from it should not be chosen, so the same goes for the clamping requirements as it has to boost the current, so it has to be chosen wisely. The clamping current will be 50A. When the voltage spike is encountered, the varistors can make the desired changes without any further delays, which will protect the device from any hazardous accidents.
The epoxy coating
These tiny devices quickly respond if they have been appropriately chosen. They convert the impedances from normal to high to a very low level at such a speed so that the equipment does not falter while working. The varistors have a specific epoxy coated disc construction along with the radical leads that are necessary for their lifelong use and aiding them in protecting the devices from transient voltage spikes. The energy absorption has to be real quick so that the unwanted ones can heat up and disappear in the middle of the process.
Their multiple uses
Every electronic device, from a smartphone to all those heavy motors and generators that are used in industrial sectors, lighting products, home appliances, automotive electronics, etc., needs a varistor to do the needful work so that they do not lose their unique devices. The computers, televisions, DC/AC converters, medical and therapeutic equipment, washing machine, etc., and many more things that an average household possesses. The vast industries that are engaged in manufacturing the best devices with the help of large machines may need the extra protection that only varistors can provide for their products' enhanced performance.