Ngwa ahụ dabere na nchikota ebili mmiri chọrọ nke sistemu ike nkesa SPD II dị ala, na-enye ike imepụta voltaji mkpali (1.2 / 50μs) na mkpali ugbu a (8/20μs), a na-eji maka ule ọkwa III na ịmachi ule voltaji. nke SPD na components.