is an international technical standard that provides comprehensive guidelines for the selection and application of surge arresters in high-voltage three-phase systems (above 1 kV). Overview of IEC 60099-5
The traditional framework categorized station and distribution arresters using a rigid structure ranging from Class 1 to Class 5. While simple, this approach often failed to differentiate accurately between an arrester's momentary impulse tolerance and its long-term thermal dissipation capability. The New Classification System iec 600995 pdf
"IEC 60095-1:2018 pdf" or "IEC 60095-5:2023" (latest editions). iec 600995 pdf
) characteristic plot highlights the transition from a leakage current state to a high-conduction surge mitigation state: Step-by-Step Selection Procedure iec 600995 pdf