The varistor is mainly used to perform as a line voltage surge suppressor.
Mov surge protector circuit.
Movs have been very popular for many years due to their low cost and their remarkable ability to handle large surge currents.
An mov is designed to protect against instantaneous high voltage surges that may last for not more than a few nano seconds for example if there s an instantaneous voltage spike of say 600 v for 3 nano seconds the mov will happily neutralize it by short circuiting it across the connected terminals.
They are also commonly used in external surge protectors intended for use on the ac mains.
The metal oxide varistor is designed to protect various types of electronic devices and semiconductor elements from switching and induced lightning surges.
Simple and inexpensive the mov absorbs the energy in a surge preventing it from damaging other devices in a circuit.
However it is not limited particularly in ac grid lines.
The appropriate safety listing for a surge suppressor that uses movs as clamping components is ul 1449.
If the voltage from the outlet surges or spikes rises above the accepted level the surge protector diverts the extra electricity into the outlet s grounding wire.
The metal oxide varistor or mov is a voltage dependent nonlinear device that provides excellent transient voltage suppression.
Ul 1449 is the safety standard for tvss transient voltage surge suppressors.
A word of caution.
Excessive voltage triggers the mov into action so to size it for surge protection select a voltage rating suitable for the equipment you want to protect.
A simple mov surge protector with line conditioning and a fuse.
A standard surge protector passes the electrical current along from the outlet to a number of electrical and electronic devices plugged into the power strip.
Surge protection circuit is the one referred by many as protector for voltage spikes in ac grid lines.
The advantage is simple circuit and low cost which can meet the surge protection needs to under 1000 joules.
Other brands 1 level surge protection circuit most of other surge protector makers use 1 level mov parallel circuit that connects multiple mov components with surge protection functions to certain joules.
Surge protector or surge protection device is a device that will provide surge suppression or voltage spike suppression so that sensitive devices will not get 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.
But if a high surge lighting that is higher in rate that a varistor can handle is passed through it the component will not perform.
This is a surge protector.
The device does not conduct when the voltage across it is below the clamping voltage.
Metal oxide varistors movs are widely used for surge protection on the ac mains ports of electronic products.
