VE17M00400K--

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Varistors, also known as MOVs (Metal Oxide Varistors), are non-linear voltage-dependent resistors that offer protection from transient voltage surges and other overvoltage faults. One type of varistor commonly used for this purpose is the VE17M00400K. This article will explore the application field and working principles of the VE17M00400K.

VE17M00400K Application Field

The VE17M00400K is mainly used for overvoltage protection. Its application field covers low and high frequency EFT surge protection, ESD protection, overvoltage transient protection, lightning protection, and EMI/RFI smoothing. Additionally, it can also be used to suppress harmonic rectifier oscillations and as a circuit breaker in motor control circuits.

With its low clamping voltage of 387 VAC, the VE17M00400K is an excellent choice for EFT protection. It can also be used in the harshest ESD conditions, with static discharge up to 30 kV. The device also offers an impressive peak power rating, making it suitable for withstanding lightning transients of up to 250 amperes.

VE17M00400K Working Principle

The VE17M00400K is based on the principle of metal-oxide varistor (MOV) technology. MOVs are made up of zinc oxide and other metal oxide materials such as ceramics or electrolytes. They work by clamping the voltage when the current flowing through it exceeds a certain threshold or “clamping voltage”. This voltage is usually in the range of 700-900 VAC.

The VE17M00400K consists of two main components: the Zinc Oxide (ZnO) and other oxides. The ZnO forms a barrier layer which has a relatively low resistivity and acts as a varistor. The other oxides are made up of different elements with higher resistivity. They act as the dielectric insulation layer.

When the voltage at the device exceeds the breakdown voltage, the barrier layer becomes conductive and the current is shunted away from the circuit. This limits the voltage in the circuit, protecting it from voltage surges and overvoltage faults. After the voltage is dampened, the device returns to its original state.

Conclusion

The VE17M00400K is a versatile varistor designed for overvoltage protection. It offers excellent performance in a variety of applications, including EFT and surge protection, ESD protection, overvoltage transient protection, lightning protection, and EMI/RFI smoothing. Its metal-oxide technology and low clamping voltage make it an ideal choice for protection from sudden voltage spikes and other overvoltage faults.

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