ERZ-C20DK621U

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Surge protection is essential in today’s modern electronic components and circuits to ensure reliable operation and extended life. TVS, Varistors, and MOVs are all devices designed for this purpose. The ERZ-C20DK621U is a METAL-OXIDE VARISTOR (MOV) that is designed to protect against voltage surges and voltage spikes that can occur due to lightning strikes or power line faults. In this article, we will discuss the application field, and working principle of the ERZ-C20DK621U.

Application Field

The ERZ-C20DK621U is a two-terminal device that is used to protect against overvoltages that may occur as a result of lightning strikes. It is specially designed to absorb lightning current peaks of up to 330kA and withstand a transient overvoltage of up to 6.0 kV. This device is well-suited for power line applications, such as electric motors, industrial control panels, and medical equipment. It can also be used in smaller consumer electronic systems, such as hair dryers, mobile phones, and home appliances.

Working Principle

The ERZ-C20DK621U is a nonlinear, variable resistance device that is designed to absorb voltage overshoots when the power is switched off. This device works on the principle of a resistor and a dielectric that is placed between two metal plates. This combination allows the device to absorb and dissipate transient overvoltages without causing any damage to the system. The metal plate on the varistor acts as an anode while the dielectric material placed between the plates is the cathode. When a surge arises, current flows, carrying the current to the anode and ionizing the gas in the dielectric material, which releases energy as the electrons recombine. This energy is dissipated as heat allowing the voltage overshoots to be clamped down before they reach the device being protected.

The ERZ-C20DK621U can also be used in reverse mode where it can be connected in series with capacitive loads to absorb voltage overshoots. In this configuration, the device acts as a low-pass filter that helps to dampen any voltage transients in the system. This configuration is very useful for eliminating transients associated with switching power supplies, high-power amplifiers, and other capacitive loads.

Conclusion

The ERZ-C20DK621U is a two-terminal Metal-Oxide Varistor (MOV) device that is designed to protect against voltage surges and voltage spikes. This device works on the principle of a resistor and a dielectric material that is placed between two metal plates. It is specially designed to absorb lightning current peaks of up to 330kA and withstand a transient overvoltage of up to 6.0 kV. This device is well-suited for power line applications, such as electric motors, industrial control panels, and medical equipment. The ERZ-C20DK621U can also be used in reverse mode where it can be connected in series with capacitive loads to absorb voltage overshoots.

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