V120ZT1

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V120ZT1 Application Field and Working Principle

The V120ZT1 is a varistor, or voltage-dependent resistor, that is commonly used in surge protection. A varistor is a two-terminal non-linear electronic component that has a voltage-dependent resistance. The resistance of a varistor can change depending on the applied voltage, creating a non-linear voltage-current relationship.

The V120ZT1 is designed to protect circuits and equipment exposed to high voltage transients such as lightning, inductive switching events, and electrostatic discharges. The V120ZT1 has a highly reliable voltage clamping capability, and is capable of dissipating up to 150 Joules per pulse. The V120ZT1 can absorb multiple temporary transients in the range of 0 to 1200 volts, and has a breakdown voltage of 120 volts.

The working principle of a varistor is a bit more complicated than its application. A varistor consists of two electrodes, one of which is made from a type of semiconductor material known as metal-oxide. When a voltage is applied to the electrodes, the electron orbitals of the metal-oxide atoms become distorted. This distortion causes an increase in the number of holes between the oxide layer and the semiconductor material. These holes allow the current to flow more easily through the varistor, which reduces the voltage across it.

The current through a varistor is non-linear and varies depending on the applied voltage. When the voltage across the varistor reaches a certain level, known as the rated breakdown voltage, the varistor breaks down and its resistance drops to a very low level. This sudden drop in resistance provides a clamping action that limits the voltage across the circuit or equipment being protected.

The V120ZT1 is a very useful and reliable component for surge protection, and is commonly used in a variety of applications. It is capable of withstanding multiple transients and its voltage-dependent resistance provides a reliable clamping action that can protect circuits and equipment from damage due to high voltage transients.

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