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IEC 60947-2 — Circuit Breakers (summary)

What it covers

• Scope: Low-voltage circuit-breakers for switching and protecting electrical circuits in industrial, commercial and residential applications.
• Main subjects: Definitions, ratings, construction, performance, test requirements, marking, and information for use.
• Types included: Molded-case circuit breakers (MCCBs), miniature circuit-breakers (MCBs) and other low-voltage power circuit-breakers where applicable.

Selectivity Category B: Devices featuring a short-time withstand current rating ( Icwcap I sub c w end-sub

Scope of IEC 60947-2

: Breakers without an intentional short-time delay for selectivity. These are typically Moulded Case Circuit Breakers (MCCBs) where the service breaking capacity ( cap I sub c s end-sub ) is often a percentage of the ultimate breaking capacity ( cap I sub c u end-sub Utilization Category B iec 60947-2 pdf

The standard covers diverse industrial hardware like Air Circuit Breakers (ACBs) and Molded Case Circuit Breakers (MCCBs). It breaks these products down by how they interact with heavy electrical loads: IEC 60947-2 — Circuit Breakers (summary) What it covers

Key Requirements

Utilization Categories: Standardizes breakers into Category A (non-selective) and Category B (selective, allowing for short-time delays to coordinate with other breakers). Rigorous Testing Requirements Selectivity Category B : Devices featuring a short-time