Surge Protector Circuit Using Mov

Home home electrical circuits ac 220v 120v mains surge protector circuits the values of the components i intend to use is.

Surge protector circuit using mov.

Thermistor sck201romsby size 20mm termination radial. Simple and inexpensive the mov absorbs the energy in a surge preventing it from damaging other devices in a circuit. Traditional radial through hole mov metal oxide varistor devices are available in diameters of 5mm 7mm 10mm 14mm 20mm and 25mm. A metal oxide varistor or mov is an electronic component that protects equipment from voltage surges in a power line such as from lightning strikes.

When exposed to high transient voltage the mov clamps voltage to a safe level. Transient protector using inductors and mov. A metal oxide varistor absorbs potentially destructive energy and dissipates it as heat thus protecting vulnerable circuit components and preventing system damage. A word of caution.

They are fit for providing voltage surge protection for a wide variety of applications and include the c iii itmov la tmov ra ultramov ultramov25s and za series. How to test a mov metal oxide varistor surge protector device. Question regarding surge prevention in electronic ballast. Mov is the most commonly used type of varistor.

Using this option typically requires the mov to have a nominal turn on threshold that is above 1500 v rms which has the effect of potentially limiting the usefulness of the mov surge protection. The rationale is that if the likelihood of surge damage to the mov is low the risk of fire is adequately addressed. This is a surge protector. This is just one part of our project which is to have a built in sure protection for wall outlets using 2 diodes with cathodes connected to each other and movs.

Attached is the surge protection circuit we have decided for our group research thesis. About the mov metal oxide varistors. Varistors can absorb part of a surge. Excessive voltage triggers the mov into action.

However metal oxide varistors are available in a wide range of varistor voltages from about 10 volts to over 1 000 volts ac or dc so selection can be helped by knowing the supply voltage. This design is not great it s slow to act depending on a relay it will take many ms to switch off at current max relay current and a 250v mov in 120v installation won t help much either.