products Arrester SURGEFREE 소방방재용 분전반 SZK-040-220S SZK-040-220S The SZK-040-220S is a surge protection device for single-phase 2-wire power systems, featuring a nominal discharge current of 20kA, a maximum discharge current of 40kA, and a voltage protection level below 2kV. Download Datasheet (PDF) Technical Support, Sales & Service Tel. +82-2-2616-0533