B72220S0400K551 Circuit Protection

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TVS - Varistors, MOVs

B72220S0400K551 is a metal-oxide varistor, abbreviated as MOV, which consists of an oxide component such as zinc oxide. This type of product belongs to the evergreen TVS - Varistors, MOVs products series, which is characterized by high surge capability and high reliability. It is widely applied in the industries related to power supply, computers, communication, and instrumentation, etc.

Application Field

Being developed for many decades with endless improvement, MOVs has become the main product for connecting overloaded lines, especially in the industry of power. It is the number one choice to protect the lines from overvoltage cause by lightning, electrical surges and transient spike. The MOVs can zap and disperse the instantaneous current and voltage in a very short time, becoming an irreplaceable protector to power equipment from overload.

Industries advantage of the superior performance from the MOVs will include:

• Switch Modes Power Supply (SMPS)
• Telecommunication
• Medical facilities
• Computer networks
• Automotive lighting
• Home appliances
• Telephone and broadband lines

Working Principle

The working principle of MOVs is based on its unique composition of metal and oxides. When a voltage is applied to the metal component, the capacity of the oxide material would change suddenly, causing an avalanche effect by creating a huge current in the two directions respectively, resulting in the clamping of voltage. This kind of reaction enables the MOVs to hold a surge and protect the interconnected devices.

MOVs have low AC parasitic capacitance and low clamping voltage, leading to low power losses and smaller voltage difference between the two directions. That being said, the cost of production will be kept at the minimum and the capacity won\'t be compromised due to the high capacitance.

In case of a major electric surge occurs, even at a voltage of a few hundred or more, the MOVs will operate no more than two or three milliseconds, dispersing the huge voltage and current and achieve the goal of equipment protection. In conclusion, B72220S0400K551 is an irreplaceable product with its specific characteristics, contributing to the prevention of electrical leakage, contact failure, and other faults caused by overvoltage.

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