本标准涵盖金属封闭的低压电力断路器开关设备组件，包括但不限于低压电力断路器（熔断或未熔断）、其他中断装置、开关、控制、仪表和计量以及保护和调节设备。 本标准涉及封闭式而非开放式室内和室外开关设备组件。它包括属于二次单元变电站的设备类型。本标准不适用于工业控制标准所涵盖的设备、通信配电盘、通信交换设备、船上使用的配电盘或死配电盘- 前配电盘。 在本标准中，金属封闭低压电力断路器开关设备应称为低压开关设备。对于低压交流开关设备，标称系统电压应为1000 Vac或以下；对于低压直流开关设备，额定最大电压应为3200 Vdc或以下。

This standard covers metal-enclosed low-voltage power circuit breaker switchgear assemblies containing, but not limited to, such devices as low-voltage power circuit breakers (fused or unfused), other interrupting devices, switches, control, instrumentation, and metering, and protective and regulating equipment. This standard is concerned with enclosed, rather than open, indoor and outdoor switchgear assemblies. It includes types of equipment that are part of secondary unit substations. It does not apply to equipment covered by industrial control standards, communication switchboards, communication switching equipment, switchboards for use on board ships, or dead-front distribution switchboards. In this standard, metal-enclosed low-voltage power circuit breaker switchgear shall be called LV switchgear. For LV ac switchgear, the nominal system voltage shall be 1000 Vac or below; for LV dc switchgear, the rated maximum voltage shall be 3200 Vdc or below.