ROV10-301K

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TVSs or transient voltage suppressors are components which are used to absorb and regulate voltage or current related transients. MOVs or metal oxide varistors are one type of transient voltage suppressor which regulate sudden changes in voltage or current. Today, one of the major manufacturers of MOVs is Littelfuse. One of its products, ROV10-301K, is an example of an MOV.

The ROV10-301K is a general purpose metal oxide varistor which has a clamping voltage of 14.4V. It has an AC 1000V rated voltage with a surge capability of 20kA (8/20µs). It is a low response varistor with a response time of 1ns max, and a total capacitance of 0.273 pF max.

The construction of the ROV10-301K is simple. It consists of a ceramic disc with a layer of zinc oxide settled at the center, surrounded by copper electrodes. To protect the varistor from degradation, there is also a protective coating of carbon around it. When an excessive voltage is applied across the varistor, the zinc oxide absorbs the surplus energy, thus preventing it from entering the electronic circuitry.

The application field of the ROV10-301K includes protection devices for appliances and circuits, improve immunity in various electronic systems, and energy absorption. It can be used to protect circuit boards, motors, logic circuit boards, and sensors from higher than normal voltages. It can also be used to reduce the voltage along the power line. Other applications of ROV10-301K include equipment, power distribution systems, floor and wall socket outlets, lamps, DC/AC converters, and similar other products.

The working principle of the ROV10-301K can be explained through its basic construction. When an excessive current is passed through the varistor, the zinc oxide absorbs the energy, thus effectively preventing the voltage from damaging the circuit. This operation creates a small increase in temperature, which is released through the metallic area of the varistor. The overall response time of the MOV is very short, allowing it to absorb and regulate the transient voltage or current very quickly. This reduces the amount of damage caused to the circuit.

In conclusion, ROV10-301K is an MOV from Littelfuse, used to protect circuits, equipments, and other components from excessive voltage. It can handle up to 1000V AC rated voltage and has an 8/20µs surge capability of up to 20kA. Its construction consists of a ceramic base with a layer of zinc oxide in the center, surrounded by copper electrodes. Apart from providing protection from transients, it also helps reduce the voltage along the power distribution lines.

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