IEC 60947-2 specifies requirements for low-voltage circuit breakers used in industrial applications, covering devices up to 1,000 V a.c. or 1,500 V d.c.. It defines technical criteria for selectivity categories and outlines rigorous testing procedures for rated current and short-circuit capacity. For a practical, in-depth guide on the standard's application, see the BEAMA guide. IEC-60947-2-2016-AMD1-2019.pdf - iTeh Standards

Key Requirements Defined in IEC 60947-2

A thorough reading of an IEC 60947-2 pdf reveals detailed technical requirements. Here are the most critical sections you must understand:

Key Aspects of IEC 60947-2

He scrolled down to the scope section. "But this—IEC 60947-2—is for circuit-breakers intended for industrial use. This is the code that governs the equipment that keeps factories, hospitals, and skyscrapers running."

Key sections (typical structure)

  1. General rules and definitions — terms (e.g., rated current In, rated breaking capacity Icu/Ics), classification of circuit-breakers.
  2. Ratings and characteristics — rated voltage, rated frequency, rated current, utilization categories.
  3. Construction and performance requirements — mechanical and electrical endurance, temperature rise, dielectric properties.
  4. Short-circuit performance — breaking capacity, making capacity, limiting short-circuit current, service short-circuit rating (Ics).
  5. Trip characteristics and thermal/magnetic protection — time–current curves, calibration limits, adjustable settings.
  6. Type tests and routine tests — tests manufacturers must pass (e.g., dielectric, mechanical endurance, short-circuit, temperature-rise, abnormal heat).
  7. Marking, information and documentation — required nameplate data, instructions for selection, installation and maintenance.
  8. Guidance for selection & coordination — selecting devices for system voltage/current, discrimination (selectivity) and coordination with upstream/downstream devices.
  9. Special types and accessories — accessories, remote tripping, auxiliary contacts, etc.

IEC 60947-2 is the internationally recognized technical standard for low-voltage circuit breakers intended for industrial and similar installations. Unlike the IEC 60898 standard meant for residential use, 60947-2 is designed for operation by "instructed or skilled persons". iTeh Standards Key Overview & Scope Voltage Limits : Applies to circuit breakers with rated voltages up to 1,000 V AC 1,500 V DC Current Range : Covers a wide spectrum from a few Amps up to 6,300A and higher Device Types : Primarily governs Moulded Case Circuit Breakers (MCCBs) Air Circuit Breakers (ACBs) Safety Assurance

: Includes rigorous sequences to verify thermal properties, dielectric strength, and operational performance. Recent Amendments and Ed. 5.0 Updates