ROV14-751K

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TVS or transient voltage suppressor is used to protect against electrical transients, which are short bursts of power. MOV or metal oxide varistor is one type of TVS, which is designed to absorb surges of energy. ROV14-751K is a unique kind of MOV, which is designed primarily for circuit protection in AC power line applications.

ROV14-751K features a melting-point-alloy-actuated switch, which is much faster than conventional varistors. To be specific, it can effectively limit transients to within 10% of the clamp voltage within one cycle. In addition, it can also be used as an AC power line snubber.

Generally, ROV14-751K is used to protect circuits and components from high voltage transients across the AC line, even if the line voltage exceeds the operating voltage of the equipment. Its peak pulse current is 70A (tP=8/20 μs) and its normal operating voltage range is from 300 to 750V. It also provides a leakage current no greater than 4mA when applied to a voltage of 600V.

In term of working principles, ROV14-751K is made up of three parts (figure 1). The first part is two varistors (MOV). These two are connected in parallel and serve as the active components of the suppressor. The second part is a metal-oxide resistor, which acts as the shunt. The shunt is connected in series with the two varistors and gives the ROV14-751K its ability to absorb high surge current. The third part is a bi-metal relay. This relay is connected in series with the suppressor and acts as a switch. The bi-metal relay is actuated by a melting-point-alloy, and is capable of detecting a specified thermal change and then opening quickly to protect the MOVs from a potentially destructive surge event.

Moreover, once the built-in thermistor senses a surge or transient, it will quickly disconnect the MOVs from the circuit, thus preventing them from being damaged. The MOVs, in turn, absorb the energy from the surge. Then, the thermistor will cool down and reset the switch, allowing the MOVs to resume their normal operations.

In conclusion, the ROV14-751K is a powerful MOV designed for AC power line applications. Its unique design allows it to withstand high voltage transients effectively, and its fast-acting switch is capable of quickly disconnecting it from the circuit in cases of surge events. This makes it an ideal choice for circuit and component protection.

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