... switch cabinet), the standard of DL4047-91 (indoor AC switch cabinet ordering technique) and the standard of IEC298 (AC metal-enclosed and control equipments ... 3150,4000,5000specified short circuit drop-out currentKA20, 25, 31.5,40,50,63Rated short circuit making currentKA50, 63, 80,100 ... 130,160Rated short-time withstand current (4S)KA20, 25, 31.5,40,50,63Rated withstand current (peak)KA50, 63, 80,100 ...