is an international standard developed by the International Electrotechnical Commission (IEC) that applies to low-voltage circuit-breakers intended for use in industrial, commercial, and similar applications [5.5].
A common point of confusion is choosing between an IEC 60947-2 breaker and an IEC 60898-1 breaker. The differences lie in the operating environment and user expertise:
(Rated Insulation Voltage): The dielectric test voltage limit. The operational voltage ( Uecap U sub e ) must never exceed this value. Uimpcap U sub i m p end-sub
Specifies testing parameters for ungrounded or high-impedance grounded industrial networks. ✅ Summary of Key IEC 60947-2 Parameters
) without sustaining damage, allowing downstream devices to isolate the fault. 4. Rigorous Testing Sequences Required by IEC 60947-2 iec 60947-2 pdf
As mentioned earlier, the transition from the 2016 edition to the 2024 edition is now underway. For manufacturers holding certificates based on the older version, the key dates to remember are:
: It includes requirements for overcurrent protection, isolation, and can incorporate Residual Current Devices (RCD) through specific annexes like Annex B or M. Where to Find the Document
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This comprehensive guide breaks down the core sections of the IEC 60947-2 technical framework, explains critical parameters like ICU and ICS, details testing procedures, and outlines how to interpret the technical datasheets often found in these PDF documents. 1. Introduction to IEC 60947-2 is an international standard developed by the International
(Rated Impulse Withstand Voltage): The peak value of an impulse voltage wave that the equipment can withstand without failure. It measures the breaker's resilience against atmospheric overvoltages (like lightning strikes) or switching surges. Incap I sub n
The official source for the latest edition of IEC 60947-2. VDE Verlag: Provides access to IEC-Normen/60947-2 updates. ANSI Webstore: Offers IEC 60947-2 in digital format. Conclusion
One of the most critical applications of IEC 60947-2 is in achieving (also known as discrimination) in electrical distribution systems. Selectivity ensures that when a fault occurs, only the circuit-breaker closest to the fault opens, leaving the rest of the system energized and operational. This is essential for maintaining power availability in critical industrial processes.
: Circuit breakers are the primary defense against catastrophic electrical failures in power distribution networks. The operational voltage ( Uecap U sub e
Using a residential circuit-breaker (IEC 60898-1) in place of an industrial one (IEC 60947-2) can have serious consequences, as the residential device is not designed for the higher fault levels, harsh environmental conditions, or demanding operational requirements found in industrial settings.
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3. Circuit Breaker Classifications: Category A vs. Category B
(Rated Current): The maximum continuous current the breaker can carry indefinitely at a specified ambient temperature without overheating. Icucap I sub c u end-sub