Understanding IEC 60947-2: The Ultimate Guide to Low-Voltage Circuit Breakers
| Feature | IEC 60947-2 | IEC 60898-1 | |---------|-------------|-------------| | Primary Application | Industrial | Residential / Commercial | | Maximum Current | 6,300 A and higher | 125 A maximum | | Short-circuit Capacity | Up to 200 kA | 25 kA maximum | | Intended User | Skilled persons only | Ordinary persons | | Trip Characteristics | Broad range (K, Z, MA, etc.) ±20% tolerance | Limited (B, C, D curves) | | Adjustability | Often adjustable | Fixed | | Pollution Degree | Typically higher (e.g., PD3 for severe conditions) | Typically lower (e.g., PD2) |
Once you have an , you can decode any manufacturer’s datasheet. Look for these markings: iec 60947-2 pdf
To assist you when reviewing product specifications or an online PDF brochure, keep this quick mathematical relationship in mind for low-voltage power system designs:
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Breakers designed for selectivity with a short-time withstand current ( cap I sub c w end-sub ) and associated delay, often used for upstream protection. Current Limiting:
The most recent version is , which supersedes the previous edition (IEC 60947-2:2016+A1:2019). The article should cover what the standard is,
Always ensure that the actual calculated short-circuit current at the installation point does not exceed the certified Icscap I sub c s end-sub
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