IEC 61009-1 specifies the short-circuit capacity of the device. It dictates how much fault current a breaker can safely interrupt without exploding or failing. This is crucial for ensuring that the RCBO can handle the potential fault levels of the electrical installation where it is used.
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In simpler terms, this standard specifies the requirements for a specific type of circuit breaker known as an (Residual Current Breaker with Overcurrent protection). Unlike a standard MCB (Miniature Circuit Breaker), which only protects against overloads and short circuits, or an RCCB (Residual Current Circuit Breaker), which only protects against earth faults, an RCBO combines both functions into a single device. IEC 61009-1 specifies the short-circuit capacity of the
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The document breaks down critical performance metrics, including: