本标准中的术语和定义旨在涵盖ac（空气绝缘设备为38 kV及以下，气体绝缘设备为52 V kV及以下）和dc（3.2 kV及以下）电力开关设备组件范围内的产品，用于开关、中断、计量、保护和调节，主要用于发电、输电、，电力的分配和转换。

The terms and definitions in this standard are intended to encompass the products within the scope of ac (38 kV and below for air-insulated equipment, 52V kV and below for gas-insulated equipment) and dc (3.2 kV and below) power switchgear assemblies for switching, interrupting, metering, protection, and regulating purposes as used primarily in connection with generation, transmission, distribution, and conversion of electric power.