Eaton Memshield 3 Transient Voltage Surge Suppression Unit for the protection of low voltage distribution systems against transient overvoltage caused by direct and indirect lightning strike and switching operations. The combined lightning arrester and surge suppression device has been developed specifically for applications with MCCB panel board ensuring outstanding product performance for all sensitive, mission critical and general purpose loads. The application is according to IEC 60364-5-53 Clause 534, test class-I, II, III in accordance with IEC 61643-1, SPD-type T1, T2, T3 in accordance with EN 61643-11 standards. The lightning protection classes III and IV in accordance with IEC 62305.