Circuit-breaker IZMX16 ( Air circuit-breakers/switch-disconnectors), 4 pole, Current Range: Up to 4000 A, Rated current = rated uninterrupted current( In = Iu): 630 A, Rated ultimate short-circuit breaking capacity up to 440V/690V 42/42( Icu): 42 kA, Rated service short-circuit breaking capacity up to 440V/690V 42/42( Ics): 42 kA, Overload release, min.( Ir): 315 A, Overload release, max.( Ir): 630 A, Installation type: Fixed, Standard/Approval: IEC, Protective function: Universal protection