CSC-211 Multifunction Protection IED is selective, reliable and high speed protection IED with rich functions to cover following applications: 1) Protection, bay control unit, MU(Merging Unit), and SCU(Smart control Unit) in one IED; 2) Work as feeder or capacitor bank protection IED; 3) Work as backup protection IED for transmission lines, transformer; 4) Fully proven protection functions library; 5) 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; 6) Robust hardware with excellent EMC performance and IP54 protection under -40℃ to 70℃ operating temperature.