V551HA32

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TVS-Varistors, MOVs are a type of semiconductor device that offers overvoltage protection in various electronic circuits. Thay are widely used in many applications, such as in power circuits, automotive systems, telecom systems and industrial control systems. V551HA32 is one kind of TVS-Varistors, MOVs, which is specifically designed for working with high-voltage application, up to 1500V.

V551HA32 is a bidirectional, unidirectional-breakover varistor with an AC voltage rating of up to 1600V. It is available in several sizes, including 1/4”, 3/8”, 1/2” and 5/8”. Its dielectric strength can reach the range from 6kV to 12kV. This type of varistor has many advantages such as high surge current holding capability, low leakage current, low capacitance and low leakage current. Its capacitance is around 50pF, the leakage current is around 1mA and the surge current holding capability can reach up to 200kA/ms.

To understand the working principle of V551HA32, it is better to review the construction of a MOV. The MOV is composed of two layers of metal-oxide materials separated by a center electrode. When a overvoltage surge is present, the center electrode will become the weak link that shorts out the surge and switches off the MOV. The junction at the center electrode initiates a thermal runaway process, in which the oxide layer at the junction breaks down and a current flows through the MOV.

The V551HA32 works similarly but with a few distinctions. First, it has reverse recovery characteristics. This means that when the device is switched off (during a surge) it will revert back to its normal operating mode without generating any return currents. Second, the V551HA32 has a high surge current rating, which makes it an excellent choice for high-voltage applications. Finally, its low capacitance ensures that its electrical properties remain stable over time.

The V551HA32 is commonly used in power circuits, automotive systems, telecom systems and industrial control systems, where the need for overvoltage protection is paramount. It has a wide range of application fields, such as lighting, communication, electronics, inverters, and motors. It is designed to absorb different types of transients, including electrostatic discharges, overvoltages or lightning.

In conclusion, the V551HA32 is a bidirectional, unidirectional-breakover varistor with a high surge current rating and low capacitance. It is specifically designed for high-voltage applications and is suitable for power circuits, automotive systems, telecom systems and industrial control systems. Its reverse recovery characteristics make it an excellent choice for overvoltage protection.

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