Nkọwa dị mkpirikpi:

M4 usoro kpụziri ikpe sekit sekit, ọ na ọdabara sekit nke AC 50 / 60Hz, gosiri mkpuchite voltaji 690 V(M4-125 500V), gosiri arụ ọrụ voltaji AC 690V ma ọ bụ n'okpuru, gosiri na-arụ ọrụ ugbu a 12.5-1600A, maka ikesa ike nke eletriki na-adịkarịghị eme na-agbasa sekit na nkịtị ọnọdụ. A na-enye ndị na-agbagharị sekit na-arụ ọrụ nke nchebe megide oke ibu na obere sekit na undervoltage. Ndị na-agbaji sekit na-agbaso ụkpụrụ nke IEC60947-2. Ndị na-agbaji sekit na-ekpuchi okpukpu abụọ (Na m = 250A ma ọ bụ n'elu), a na-edozi sekit njikwa nke ngwa ahụ na isi sekit, ọ dịghịkwa mkpa imeghe ihe mkpuchi nke mkpuchi sekit mgbe ị wụnye ngwa.