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TVS – Varistors, MOVs

TVS (transient voltage suppressors) provide a cost-effective and reliable means of protection against electrical transients. Varistors are one kind of TVSs, and MOVs (metal oxide varistors) are one type of varistors.

B72587H3140S200 is a MOV that offers high surge protection with low leakage current. With surge capability up to 275V, it is suitable for applications such as telecommunication lines, cable TV, and home and building wiring, when combined with proper filtering and EMI/RFI protection schemes.

Application Field and Working Principle

The B72587H3140S200 is designed to be used in a variety of applications where surge protection and leakage current are important factors. It is suitable for high surge applications such as lightning protection, power and distribution lines, and power factor correction applications. It is also suitable for AC line protection in audio/visual equipment, telecommunication systems, and electrostatic discharge (ESD) protection, among other applications.

The B72587H3140S200 consists of a zinc oxide sensing element in an epoxy/silicone/epoxy-protected-molded-package. The MOV\'s sensing element is specially designed to operate at very low leakage levels. It also has a low capacitance design which minimizes EMI/RFI interference. When a sustained overvoltage occurs, its sensing element turns conducting, redirecting the surge to the MOV\'s ground terminal.

When a surge appears, the sensing element creates a voltage divider which produces an output voltage. This output voltage is a function of the total sudden transient voltage, the value of the sensing element, and the EMI/RFI filter\'s capacitance. The output is well shielded from the input circuit and is dissipated on the MOV’s ground terminal, thus preventing any damage to the protected system.

The B72587H3140S200 also features a special design which allows it to be directly attached to the power line with minimal additional circuit elements, and a protective shield which helps protect the MOV from any temperature or other unwanted signals.

In conclusion, the B72587H3140S200 is a high surge protection MOV with a low leakage current design. It is ideally suited for various applications where surge protection, low leakage current, and EMI/RFI filtering are important factors.

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