VK105MK151R014P050

TVS - Varistors, MOVs

The VK105MK151R014P050 is a metal-oxide varistor (MOV), which is part of a family of devices that typically have a disc or cylindrical body, used to protect electronics from voltage spikes and surges. MOVs are usually composed of a ceramic core material such as zinc oxide, with cobalt separating the metal alloy contacts. Varistors and MOVs are voltage dependent devices that effectively reduce the magnitude of transient voltage events, or fast rise time transients, on power or signal lines. This is often accomplished by providing a low impedance current path when exposed to a voltage exceeding a predetermined threshold.

Application Field

The VK105MK151R014P050 is generally used in a wide range of applications, such as power supplies, controlling power flow, and protecting circuitry. Many of these applications depend on the device’s ability to regulate the magnitude and duration of the transient voltage, as well as its ability to maintain load current, or reduce its draw on the current flow. In addition, these devices are often employed in signal and data transmission, industrial and consumer electronics, and medical instrumentation.

Working Principle

A key factor in the use of a VK105MK151R014P050 is the operation of its working principle. As mentioned previously, this device is voltage dependent and will react to any voltage differential exceeding a predetermined threshold. When this occurs, the MOV will quickly redirect the voltage to ground. It does this by acting as a very low impedance path, which in effect, turns the varistor into a short circuit.

When initially energized, the MOV will have a higher than normal resistance. This characteristic resists the flow of current when its voltage does not exceed the threshold. As the MOV is exposed to voltage above the threshold, its resistance sharply decreases allowing a large current to flow, proportional to the voltage differential. The large current flow is designed to reduce the excess voltage by dissipating it with the large current flow.

When voltage levels return to normal, the MOV quickly re-establishes its initial resistance, inhibiting an uncontrolled current build-up. Typically, this mechanism allows the MOV to resume its normal current flow, while maintaining the optimal voltage levels.

Overall, the VK105MK151R014P050 provides excellent protection from dangerous voltage surges and spikes, and is reliable and easy to use in a variety of applications.