Its 187 kA interrupting capacity at 240 V AC — derating to 121 kA at 415/440 V, 75.6 kA at 500 V, and 4.5 kA at 690 V — gives it the headroom to clear high-fault currents upstream of branch feeders without cascading failure.
In a sealed enclosure or high-ambient switchroom, that derating curve determines whether the breaker can carry the design load without nuisance tripping. The 86 mm depth, 140 mm width, and 181 mm height place it in the standard SENTRON 3VA2 footprint — it bolts directly onto the mounting plate or busbar adapter used across the 3VA2 family, so a panel kitted for a sibling variant accepts this unit without drilling or rework.