CSC-103 Line Differential Protection IED is selective, reliable and high speed protection IED for transmission line, with powerful capabilities to cover following applications: 1) For 35KV to 1000KV transmission lines, W/O serial compensation equipment, or W/O parallel lines, heavy load line, extreme long line or short line; 2) Up to 3 terminals. 3) Support duel CT inputs of multi-breaker arrangement; 4) Fully proven protection functions library; 5) Customized protection function scheme, All in one or main protection unit only 6) Powerful scalable hardware capability, for present and future application: Mixable CT&VT inputs/SV(Sampling Value) input/output;  Mixable Binary inputs & output relays/GOOSE inputs /outputs; 7) Robust hardware with excellent EMC performance and IP54 protection under -40℃ to 70℃ operating temperature.