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From lightning concepts to low-voltage power-line SPD products—a structured guide for engineers, panel builders, and local partners.

9. MOV Technology Explained · Page 1 of 5

How an MOV Works

Nonlinear resistance that clamps overvoltage.

Nonlinear behavior

At normal voltage an MOV draws tiny leakage current. When voltage rises into the surge region, resistance falls sharply and the MOV diverts surge current.

Energy absorption

The surge energy becomes heat in the MOV body. Ratings describe how much impulse energy / current the device can handle before degradation.

Why MOVs dominate LV SPDs

Fast response, compact size, and good clamping for 8/20 µs surges make MOVs ideal for Type 2 applications.

← Type Selection Worksheet

MOV Aging & End of Life →

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