Applies to all current ratings (from small molded case circuit breakers to massive air circuit breakers).
The value of voltage which, combined with a rated current, determines the application of the circuit breaker. Rated Insulation Voltage ( Uicap U sub i
| Parameter | IEC 60947-2 | IEC 60898 | |-----------|-------------|------------| | Pollution degree | 3 | 2 | | Overload trip accuracy | ±20% typical | ±10% | | Ics requirement | % of Icu (e.g., 50–100%) | 100% of Icn (for domestic) | | Isolation marking | Yes | Optional | iec 60947-2 pdf
IEC 60947-2 governs circuit-breakers for . This includes utilities, manufacturing facilities, data centers, large commercial buildings, and infrastructure projects such as airports and hospitals. The standard covers an entire spectrum of rated currents, from a few amperes to 6,300 A and higher, and includes all common industrial circuit-breaker types:
Most Molded Case Circuit Breakers (MCCBs) and Miniature Circuit Breakers (MCBs) used in final distribution. Category B Breakers Applies to all current ratings (from small molded
Sequence II: Rated Service Short-Circuit Breaking Capacity ( Icscap I sub c s end-sub
The 2024 edition adds additional tests for ground-fault overcurrent releases (Annex B), reflecting the growing importance of ground-fault protection in modern electrical systems. These breakers do not have an intentional short-time
These breakers do not have an intentional short-time delay for selectivity under short-circuit conditions.