... Apply to the power supply such as TN-S,TN-C,TT,IT 3.Rated voltage:380V surge protector1.Surge and ... Apply to the power supply such as TN-S,TN-C,TT,IT 3.Rated voltage:380V SP2 SPD,Surge Protective ... 2,000mProtection Class: IP20Applied to TT, TN-S, TN-S-C SystemStandard: IEC: 61643(Surge Arrester,surge protection,surge suppressor)surge ... to the power supply such as TN-S,TN-C,TT,IT 3.Rated voltage:380V MQU9 ...