9.1 General Features of Vacuum Interrupters9.2 Contact Material for Vacuum Switchgear9.3 Reliability of Vacuum Switchgear9.4 Electrical Lifetime9.5 Mechanical Lifetime9.6 Breaking Capacity9.7 Dielectric Withstand Capability9.8 Current Conduction9.9 Vacuum Quality9.10 Vacuum Switchgear for HV SystemsNotesReferences