V480LT40A Circuit Protection

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Varistors, also known as voltage-dependent resistors (VDRs), are components used for over-voltage protection. TVS (Transient Voltage Suppressor) devices employ the non-linear characteristics of the varistor and are designed to limit voltage transients, instead of allowing them. MOVs (Metalloxide Varistors) are a type of TVS device, and the V480LT40A is a common model in this family.

The V480LT40A is composed of zince oxide particles bonded by glass. Its rated voltage is 480 VRMS and its maximum continuous operating voltage is 418 VRMS, making it suitable for applications in which long-term stability is important. This device has a very low thermal resistance, which improves its power handling capabilities., and can protect against lightning and electrical transients, such as power cuts and surges. Its compact design makes it suitable for a variety of applications.

The working principle of the V480LT40A is simple. If a voltage difference is applied across the leads, the zinc oxide particles will move in order to lower their energy. Because of this, current will flow through the device, and its resistance will decrease. As the amount of current increases, the device will eventually reach a critical point where it must reduce the voltage across its leads. This is done by means of a varistor mechanism, which is able to break down rapidly and therefore absorb the excess voltage.

The actual working of the device can be understood with the following example. If a momentary brief surge of voltage is applied at the leads, the particles will move relatively quickly and the device will rapidly absorb the excess energy. If, however, a sustained voltage is applied, the particles will move slowly,

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