You can calculate the energy by multiplying peak surge volts by amps, and then by seconds of time. https://sciencing.com/size-mov-surge-protection-8708803.html For alternating current, or AC, divide the RMS, or root mean square, voltage by .707 to obtain a peak value. The varistor's symmetrical, sharp breakdown characteristics enable it to provide excellent transient suppression performance. This type of Spike protection circuit is present in the multi socket switch boards used to connect computer peripherals. 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 … He has contributed to "Foresight Update," a nanotechnology newsletter from the Foresight Institute. Metal oxide varistors, also known as MOVs are one of the most common types of varistors. 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. Mfr. • Similar to a test track or road test for an auto. As various parts of a circuit may have different voltages, make sure you identify where in the circuit the MOV will go. Therefore, MOVs are also suitable for use as surge protection devices in outdoor LED lighting applications. The Metal Oxide Varistor or MOV is a voltage dependent, nonlinear device that provides excellent transient voltage suppression. 30 30 Nominal Discharge Current (I n) Test • Manufacturer chooses a current they want to test with: • Type 1 – 10kA or 20kA • Type 2 – 3kA, 5kA, 10kA or 20kA The below image shows how to use MOV in the electronics circuit. Pin Description. Metal Oxide Varistors are similar to resistors and has only two leads. An MOV is a Metal Oxide Varistor. To estimate, low- to medium-power 110-volt AC equipment may have MOVs rated for between 10 and 200 joules. Circuit Setup The figure shows a bridge network which rectifies the 600 V AC to 700 V DC and this DC is then fired across the MOV circuit carrying a vulnerable 220 V, 10 watt lamp. 5pcs 14D431K 431KD14 Metal Oxide Varistor MOV 275Vac 330Vdc 275V. An arrester does not absorb lightning or stop lightning. 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. This is the voltage at which the MOV begins to absorb energy. The Metal Oxide Varistor is designed to protect various types of electronic devices and semiconductor elements from switching and induced lightning surges. A Metal Oxide Varistor (MOV) is a protection component used in power supply circuits that is powered directly from AC mains.It is used to protect the circuit from high voltage spikes by varying its resistance. Beware of MOVs the way that they fail short circuit can be very bad they can go on fire in fact I set up a discharge using a halve sine current pulse and got a short duration flame to shoot out My associate digicamerad this showing the flame to be 20 cm long and posted it on the web some years ago SO using the MOV isn't simple when you have to take fire precautions For direct current, or DC, simply use the voltage specified on the schematic. Varistors provide over voltage protection to electrical and electronic circuits in contrast to circuit breakers or fuse which provide protection to circuits from over current. The energy depends on the equipment and environment in which the MOV will work. For example, 2 MOVs rated at 500 volts will clamp at 1,000 volts. 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