The most direct source. Visit the IEC website, search for "60947-2", and purchase a PDF download. Prices typically range from 250 to 400 CHF (Swiss Francs). You receive a watermarked, official copy valid for internal use.

For selective breakers (Type B), Icw defines how long the breaker can withstand a fault current without tripping—typically 0.05 to 1 second. This allows coordination with downstream devices.

Circuit-breakers are critical for protecting electrical circuits from overcurrents (overload and short-circuit). Compliance with IEC 60947-2 ensures:

Unlike general-purpose breakers found in residential homes (which fall under IEC 60898), IEC 60947-2 covers industrial circuit-breakers. These devices handle higher fault currents, offer adjustable trip settings, and are tested for more rigorous conditions.

The standard ensures that a circuit-breaker:

If you are designing machinery for export to Europe, Asia, or other regions that adopt IEC standards, compliance with IEC 60947-2 is mandatory for CE marking in many cases.