V120ZT20PX2855

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Varistors, also referred to as Voltage Dependent Resistor (VDR) or Metal Oxide Varistor (MOV), are devices that primarily conduct electric current above a certain voltage threshold. When the voltage threshold is exceeded, the varistor will enter the conductive mode and divert the high voltage and current away from the components that is being protected. Varistors are commonly used in power supplies, AC voltage regulators and surge protection circuits for various electrical and electronic devices. As a type of variable resistor, the V120ZT20PX2855 Varistor also belongs to this category.

The V120ZT20PX2855 Varistor is a metal oxide varistor that exhibits excellent low noise under high frequency operation, low impedance at high frequencies, low insertion loss. It has a high rated voltage of 120V and a high peak surge voltage of 20V, making it well-suited for general-purpose over-voltage Crowbar protection.

In terms of applications, the V120ZT20PX2855 Varistor is mainly used in AC voltage regulators, overvoltage crowbar protection, and surge protection circuits for various electrical and electronic devices. It can be used for circuit protection applications in AC/DC converters, power supplies, TV sets, washing machines, microwaves, audio equipment. Additionally, it can also be used for Ethernet and DSL broadband communication line protection.

In terms of working principle, Varistors work primarily by a process called ‘reverse-biased diode conduction’. When the varistor is subjected to a voltage that is less than the breakdown voltage of the Varistor, the Varistor behaves like an open circuit and resists the current flow. However, when a higher voltage is applied to the Varistor, the numerous microscopic diodes formed within the varistor begins to conduct current from the negative to the positive electrodes. This effectively reduces the applied voltage and reduces the peak current, thereby, protecting the components from damage.

To conclude, the V120ZT20PX2855 Varistor is a type of Metal Oxide Varistor (MOV) device designed for general-purpose over-voltage Crowbar protection. It can be used in AC voltage regulators, surge protection circuits and overvoltage crowbar protection circuits for a variety of electrical and electronic devices. In terms of working principle, the Varistor works by a reverse-biased diode conduction, whereby when the Varistor is subjected to a voltage that is lesser than the breakdown voltage, it will behave like an open circuit, whereas, when a higher voltage is applied to the Varistor, the numerous microscopic diodes within the varistor will conduct current from the negative to positive electrodes, thereby reducing the applied voltage and peak current while protecting the components from damage.

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