Once the voltage the arrester experiences rises above the reference voltage of the arrester the mov blocks go into conduction. Simple and inexpensive the mov absorbs the energy in a surge preventing it from damaging other devices in a circuit.

Metal Oxide Varistor Mov Component For Surge Protection Devices

A metal oxide varistor mov surge arrester contains a series of metal oxide varistor blocks.

Mov for surge protection. 87 free shipping by amazon. Metal oxide varistors mov used in surge protection device s spd s whichever protecting the internal equipments from transient over voltage current. 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.

Whenever they experience a surge the clamping voltage drops a little lower after some time this can even lead to their destruction. Transient over voltage current is generating from lightning. As you can see in the diagram below an mov forms a connection between the hot power line and the grounding line.

These mov blocks are like a voltage controlled switch which acts as an insulator with line voltage. Automation systems interconnect asi asisp150 2p din rail mounted surge protection device screw clamp terminals 120 vac pluggable mov module ul1449 68 87 68. 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.

Spd s are protecting the equipment from indirect risk. In the most common type of surge protector a component called a metal oxide varistor or mov diverts the extra voltage. The movs can only be used for short surge protection they can t handle sustained surges.

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. If the movs are exposed to repeated surges their properties might slightly get degraded.