spd for tt system
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Three Phase Surge Protective Device
SP Series UL recognized Type 1ca Surge Protection Device or class II SPD per IEC61643-11; For low-voltage power supply system surge protection, especially for point of entry (Category C,D, ANSI/IEEE C62.41) and sub-circuit (Category B, ANSI/IEEE C62.41)protection. Three phase protection, for TT, IT, TN-S, TN-C system; In 20kA, Imax 50kA per pole;
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