... be used to switch on and off the loading, overloading and short-circuit current.Main Technical Parameters No. ... 40.52Rated currentA630,1000,1250,1600,20003Rated short-circuit breaking currentKA20,25,31.54Rated insulation levelPower frequency ... short - time withstand currentKA20,25,31.510Rated Short-circuit Continuing TimeS411Machinery lifeTime1000012Permissible gross wearing thickness for dynamic/static ...