V421CA32

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Transient Voltage Suppressors (TVSs) are two-terminal devices primarily designed to protect circuitry from high voltage threats such as lightning, electrostatic discharge (ESD) or faults in the power supply. TVSs are available in a variety of form factors and technologies, ranging from low-capacitance SIDACs and Thyristor Surge Protectors (TSPs) to multi-destruction device Varistors with higher clamping capability. A great example of a Varistor is the model V421CA32.

The V421CA32 is a seven-terminal, 380VAC axial Varistor that implements a metal oxide technology for transient protection. It is designed for use in high voltage circuits and features a maximum power dissipation of 6 watts. Suitable applications for the V421CA32 Varistor include AC/DC power supplies, electric motors, automotive electronics, and LED lighting.

Looking at the working principle of Varistors, we know that they are non-linear, two-terminal devices made of a semiconductor ceramic material with a grainy interior structure. When exposed to a voltage above their breakdown threshold, the material\'s resistance decreases, allowing current to flow and clamp the voltage.

One way to illustrate how a Varistor works is to compare it to a water pipe. Think of the Varistor as a faucet between two pipes, one of which contains water. When the water pressure is low, the faucet will remain closed and no water will flow through the pipeline. If, however, the pressure in the pipe increases in intensity, the faucet will eventually give way and allow water to flow.

The same principle applies to the V421CA32. The Varistor is designed to be placed in parallel with the protected circuit and the rated current limiter. In threat scenarios, the voltage will increase, causing the Varistor to eventually open and allow current to flow, thus limiting the voltage and protecting the system.

The V421CA32 Varistor\'s specifications include a breakdown voltage of 370V ±20%, an operating temperature range of -40°C to 125°C, and a surge current of 3300A (25x1000 μs). It is a RoHS compliant device, and it also features a Flame Retardant (UL 94V-0) rated body for added safety.

The V421CA32 Varistor offers excellent protection against transient voltages and surges. It has a wide operating temperature range and is able to withstand high surge currents for long periods of time without damage, making it ideal for a variety of applications. Its metal oxide technology and flame retardant body ensure reliable performance and help ensure the safety of the system.

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