Surge Protector Circuit Using Mov

It is called so as the component is made from a mixture of zinc oxide and other metal oxides like cobalt manganese and so on and is kept intact between two electrodes which are basically metal plates.

Surge protector circuit using mov.

The rationale is that if the likelihood of surge damage to the mov is low the risk of fire is adequately addressed. Excessive voltage triggers the mov into action. 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.

A word of caution. Home home electrical circuits ac 220v 120v mains surge protector circuits the values of the components i intend to use is. 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. Attached is the surge protection circuit we have decided for our group research thesis.

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. Varistors can absorb part of a surge. Metal oxide varistor basics. 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.

A metal oxide varistor absorbs potentially destructive energy and dissipates it as heat thus protecting vulnerable circuit components and preventing system damage. 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. In general mov selection for the electrical protection of circuits from power supply transients and spikes is often little more than an educated guess. Question regarding surge prevention in electronic ballast.

About the mov metal oxide varistors. Mov is the most commonly used type of varistor. How to test a mov metal oxide varistor surge protector device. Traditional radial through hole mov metal oxide varistor devices are available in diameters of 5mm 7mm 10mm 14mm 20mm and 25mm.

This is a surge protector. When exposed to high transient voltage the mov clamps voltage to a safe level.