Inverter 10D MOV Electrical Component , Practical Oxide Varistor Metal 10D471K 10D561K 10D220K 10D470K 10D180K

Non-Polarity MOV-10D Metal Oxide Varistor For Voltage Spike Protection

How to use a metal oxide varistor in a circuit?

When the voltage is within the rated limits, the resistance of the MOV will be very high, so all the current flows through the circuit and no current flows through the MOV.

But when there is a voltage spike on the mains it will appear directly on the MOV since it is in parallel with the AC mains. This high voltage will reduce the resistance value of the MOV to a very low value, making it look like a short circuit.

This forces a high current through the MOV, which will cause the fuse to flow and disconnect the circuit from the supply voltage. During voltage spikes, the fault's high voltage will quickly return to normal values, in those cases the current will not last long enough to blow the fuse and the circuit returns to normal operation when the voltage becomes normal. However, every time a spike is detected, the MOV breaks the circuit by shorting out, damaging itself each time with the high current. So if you find MOVs damaged in any power circuit, it's probably because the circuit experienced many voltage spikes.

Production Process / Quality Control​

Application

1. Varistor voltage: refers to the voltage value across the varistor at a specified temperature and DC (generally 1mA or 0.1mA). Recorded as V1mA or V0.1mAo
2. Maximum continuous voltage: refers to the maximum effective value of sinusoidal AC voltage or the maximum DC voltage value that can be continuously applied to both ends of the varistor for a long time under the specified ambient temperature
3. Limiting voltage: refers to the maximum peak voltage at both ends of the varistor when a specified surge current (8,20μs) passes through it.
4. Rated power: refers to the maximum average impact power that can be applied to the varistor under the specified ambient temperature.
5. Maximum energy: the maximum impact energy that can be applied to the varistor under the condition that the varistor voltage does not change more than ±10% and the impulse current waveform is 10, 1000μs or 2ms.
6. Current capacity (maximum inrush current)