ROV05H121K

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TVS - Varistors, MOVs, are fast-acting over-voltage protection devices that can help provide surge protection to a variety of electrical systems including aviation, medical, and automotive applications. The ROV05H121K is a Varistor specifically manufactured with a voltage rating of 31V and a maximum peak current of 21KA. It is described as a “soft” MOV, which indicates it is designed to have an extra high capacitance value and is best suited for applications where the voltage surge is high but of limited duration.

A Varistor is an electrical component which acts as a voltage-dependent resistor. These components are typically made of ceramic material and feature various shapes and sizes. The ROV05H121K has a cylindrical shape measuring 11mm in length and 5mm in diameter, thus making it suitable for applications requiring a small size but with a large throughput ability.

The ROV05H121K is designed for surge protection of high frequency interference, particularly ESD immunity and surge protection of I/O ports, noise and transients caused by automotive ignition system, lightning, or power line surges.

In order to understand the working principle of the ROV05H121K, we must first look at the way Varistors function. When an external over-voltage is applied to a Varistor, the electrical resistance changes instantly, which is known as the “clamping” action of the Varistor. The rapid change of the electrical resistance of the Varistor causes the current to flow through different available paths such as earth ground, therefore redirecting the surge to a safe area and protecting the vulnerable system from damage caused by the over-voltage.

The ROV05H121K Varistor specifically features a design that allows for a low insertion resistance and a high degree of repeatability. This is achieved through the “soft” design of the Varistor, meaning that it has an extra high capacitance value, which makes it more effective in dealing with high voltage surges and narrow frequency noises. In addition, this Varistor is also designed to allow currents to flow through it without creating too much heat. This ensures that the components are protected and do not suffer any damage due to electrical burnouts.

When used as a surge protection component, the ROV05H121K can withstand up to a peak current of 21KA and up to a voltage of 31V. This is suitable for applications where the voltage surge is high, but of limited duration, making it an excellent choice for protection against ESD and transients. Additionally, it has a very fast response time, which is ideal for providing protection in fast-changing situations, such as those caused by lightning surge and automotive ignition systems.

In conclusion, the ROV05H121K Varistor is an excellent choice for applications seeking high voltage surge protection with an extra high capacitance. It has a fast response time and is capable of withstanding up to 21KA in peak current and up to 31V in voltage. In addition, its “soft” design makes it ideal for protection against narrow frequency noises, making it suitable for a variety of applications from automotive to aviation.

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