NAP-30-221

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Power line filter modules are components used to reduce the effects of conducted and electromagnetic interference (EMI) that flows over a power line. The NAP-30-221 is a particular type of power line filter module and is a high-performance addition to the power line filter industry. This article will provide an overview of the NAP-30-221 application field and working principle.

Application Field

The NAP-30-221 is specifically designed for single-phase photovoltaic inverters. It is suitable for 10A to 30A, 480V AC or 400V AC applications. This power line filter module offers a high attenuating performance of conducted emissions, and is able to quench electromagnetic interference (EMI) up to 30MHz. The filter module has an AC power rating of 2kW, and a small footprint of 70×70×170 mm. The module is manufactured with a series of varistors and capacitors that create a low-impedance low-pass filter functioning as an EMI filter.

Working Principle

The NAP-30-221 includes two components, an AC power filter and a DC power filter. The AC power filter is composed of a series of capacitors and varistors. These components act as a low-pass filter, which removes frequencies higher than its cut-off frequency and attenuates them to a much lower level, as defined by the equation below.

Attenuation = 20 log₁₀ (

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