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TVS (Transient Voltage Suppressors) - Varistors, MOVs are types of transient voltage surge suppressors designed to protect electrical circuits, PCs, electrical systems, and communications networks from damage due to overvoltage. These types of suppliers are primarily used in circuit designs to provide additional protection from externally or internally produced electrical surges, which can be due to lightning or power surges from the grid. MOVs (Metal Oxide Varistors) and Varistors are two popular components in the surge suppressor market. Each type of surge suppression device has its own particular working principles and applications.

Varistors

Varistors stand for Voltage Dependent Resistors. They are named so because they exhibit a unique two-terminal electrical characteristic; their value of resistance varies with the applied voltage. At normal working voltages, they show a very high resistance, while at high voltage levels they exhibit a much lower resistance. Varistors are device sandwiched between two metal plates that act as the two poles of the voltage-controlled resistor.

Varistors have a very high surge handling capability, and they are mostly used to protect circuit components from overvoltage surges or spikes. Varistors are ideal for a variety of applications such as DC line protection, inductive load protection, and lightning protection. They are used in a wide range of products, from consumer electronics to aerospace systems.

MOVs

MOVs stands for Metal Oxide Varistors, and they are essentially devices with two layers of metal-oxide materials. When a voltage is applied across the two terminals of the MOV, a current is generated and the resistance of the device changes, depending on the applied voltage. The resistance of the MOV\'s decreases as the voltage increases.

MOVs are mainly used for overvoltage protection and have a wide range of applications, such as protecting sensitive microelectronic components, power supplies, and military and aerospace systems. MOVs are also used in commercial and residential surge suppression devices, such as surge protectors, surge protectors for AC and DC motors, and UPS systems.

MOVs have a very fast response time and can typically handle surge currents up to tens of thousands of amps. MOVs also have a very low clamping voltage, which means that they can protect sensitive components from relatively low levels of overvoltage.

Comparison

When choosing between Varistors and MOVs for a surge suppression application, there are several factors to consider. Both devices are effective to provide surge protection, however, they have different characteristics in terms of response time, surge handling capability, and their clamping voltage. Varistors have a slower response time and a lower surge handling capability than MOVs, meaning that they are unable to protect from very high voltage surges. MOVs are able to handle greater surge currents and clamp voltages and they have a much faster response time. Hence, MOVs are generally more suitable for applications requiring fast protection from high voltage surges.

In conclusion, Varistors and MOVs can both be used in surge protection applications. Varistors are more suitable for applications with lower surge currents, while MOVs are better suited for applications with high surge currents and a fast response time. With careful consideration of application-specific needs, Varistors and MOVs can both provide effective protection from electrical surges.