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Breaking capacity or interrupting rating [1] [2] is the current that a fuse, circuit breaker, or other electrical apparatus is able to interrupt without being destroyed or causing an electric arc with unacceptable duration.
When a large electric current is interrupted an arc forms, and if the breaking capacity of a fuse or circuit breaker is exceeded, it will not extinguish the arc. Current will continue, resulting in damage to equipment, fire, or explosion.
Unlike the traditional powerCON connectors, the new connector is specified with breaking capacity, meaning it is designed for disconnection under load [5] The maximum current rating for the TRUE1 connector is reduced to 16 A and it is not compatible with traditional powerCON connectors.
This latter figure is the ampere interrupting capacity (AIC) of the breaker. Under short-circuit conditions, the calculated or measured maximum prospective short-circuit current may be many times the normal, rated current of the circuit.
The breaking capacity is the maximum current that can safely be interrupted by the fuse. This should be higher than the prospective short-circuit current . Miniature fuses may have an interrupting rating only 10 times their rated current.
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Such circuit breakers have high carrying current rating (4 kA to 40 kA), and have a high breaking capacity (50 kA to 275 kA). They belong to the medium voltage range, but the transient recovery voltage withstand capability required by IEC/IEEE 62771-37-013 is such that the specifically developed interrupting principles must be used.
A short circuit is an abnormal connection between two nodes of an electric circuit intended to be at different voltages. This results in an electric current limited only by the Thévenin equivalent resistance of the rest of the network which can cause circuit damage, overheating, fire or explosion.