How to look at the circuit breaker capacity is how much?
but the circuit is not broken, must be arc to completely disconnect the circuit current, so the circuit breaker circuit is completely broken circuit called shut-off.
As the high-voltage current in the process of breaking, the arc, even if the circuit breaker contacts are separated,
Circuit breaker contact separation instantaneous short circuit current cycle component RMS value of the thousand.
The rated breaking current of the circuit breaker is three times the root number of the product of the rated voltage, that is, the blocking capacity.
