What is the primary difference between breaking capacity and rated current in circuit breakers?

The primary difference lies in the definitions and functions of breaking capacity and rated current in circuit breakers. Breaking capacity specifically refers to the maximum amount of fault current that a circuit breaker can safely interrupt without being damaged or failing to operate. It is a critical specification because it ensures that when a fault occurs, the circuit breaker can clear the fault and restore the system to a safe operating state.

On the other hand, rated current, often referred to as the continuous current rating, indicates the maximum continuous current a circuit breaker can carry without overheating or degrading over time during normal operation. This rating ensures that the breaker can handle expected loads under normal circumstances.

Understanding this distinction helps in selecting the appropriate circuit breaker for various applications, ensuring it can handle both operational loads and potential fault conditions effectively.