This standard applies to metal-oxide surge arresters (MOSA) designed to repeatedly limit the voltage surges on 48-62 Hz power circuits (> 1 kV) by passing surge discharge current and automatically limiting the flow of system power current. This standard applies to devices for separate mounting and to those supplied integrally with other equipment. Revision Standard - Superseded. Superseded by IEEE Std C62.11-2005. Metal-oxide surge arresters designed to repeatedly limit the voltage surges on 48-62 Hz power circuits (>1 kV) are covered in this standard. These devices operate by discharging surge current. Devices for separate mounting and those supplied integrally with other equipment are also discussed.