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This part of the IEC 62146 series is applicable to TRV capacitors used on high -voltage alternating current circuit-breakers with rated voltages above 100 kV with 50 Hz or 60 Hz. TRV capacitors are installed phase to earth, either in parallel to the bushing on dead tank circuit-breakers, or immersed inside the circuit-breaker, or freestanding close to the circuit- breaker. Their function is to limit the transient recovery voltage (TRV) and the rate of rise of recovery voltage (RRRV) on the circuit-breaker. Capacitors in compliance with this standard can be used as TRV capacitor. This standard applies to TRV capacitors falling into one or both of the following categories for: - mounting on or close to air insulated switchgear (AIS) dead tank and live tank circuit- breakers, or - mounting on gas insulated switchgear ( GIS) circuit-breakers. The testing for each of the above applications is in some cases different. This standard does not apply to grading capacitors installed in parallel to the chambers of the circuit-breaker, which are specified in IEC 62146-1. This standard does not apply to capacitors not directly associated with high-voltage alternating current circuit-breakers. The object of this standard is: - to define uniform rules regarding performances, testing and rating - to define specific safety rules - to provide a guidance for installation and operation