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PRODUCTS >> INTERNATIONAL>> SWITCHGEAR>> SURGE ARRESTERS   Approvals : CPRI - India Standards : IEC 99 - 4, 1991 S.No. TYPE REF. RATED VOLTAGE (kV) SYSTEM VOLTAGE (kV) INSULA- TION LEVEL (kV/kVp) NDC (kA) ENERGY CLASS LIRV AT NDC, 8/20 MICRO SEC (kVp) 1 ZYP D 31 9 12 28 / 75 5 DIST 32 2 ZLA X 15C 9 12 28 / 75 10   30 3 ZLA X 25C 9 12 28 / 75 10   25 4 ZYA D 31 18 24 50 / 125 5 DIST 64 5 ZLA X 15C 18 24 50 / 125 10   56 6 ZLA X 15C 30 36 70 / 170 10   90 7 ZLA X 15C 60 72.5 140 / 325 10   175  8 ZLA X 25C 36 36 70 / 170 10   84 9 ZLA X 25C 72.5 72.5 140 / 325 10   165 10 ZLA X 25C 123 123 230 / 550 10   265 11 ZLA X 25C 145 145 275 / 650 10   350 12 ZLA X 25C 145 145 275 / 650 20   320 13 ZLA X 25C 245 245 460/ 1050 10   550/575 14 ZLA X 25C 245 245 460/ 1050 20   575/620 15 ZLA X 25C 420 420 630/ 1425 & 1050 20   975 *For solidly earth systems. Other specifications ( Including LV ) are also feasible. Standard value of creepage is 25 mm/kV