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

5. IEC Standards Overview · Page 3 of 6

IEC 61643-11 Product Requirements

What Type 1 / Type 2 / Type 3 markings mean on a datasheet.

Product standard

IEC 61643-11 defines tests and preferred values for SPDs connected to LV power systems.

Performance values

Look for Uc (max continuous operating voltage), Up (voltage protection level), In, Imax, Iimp, and temporary overvoltage behavior.

Declared configurations

Manufacturer declarations must match how you wire the device (e.g., 3P+N). Mis-wiring voids the intended protection paths.

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