本标准规定了IEEE Std C37所述金属封闭低压电力断路器开关设备中使用的低压（600 V ac及以下）专用开关（LVDPS）设备（电力断路器除外）的要求。20.1（TM）。这些开关装置可用于电机控制或其他重复工作应用，并具有以下特点:a）抽出式，三极结构；b） 用于短路保护的集成限流熔断器；c） 电动，带整体式或单独安装的过电流保护装置；在本标准中，术语a？LV-DPS设备？表示符合本标准要求的低压专用开关设备。

This standard provides requirements for low-voltage (600 V ac and below) definite-purpose switching (LVDPS) devices (other than power circuit breakers) for use in metal-enclosed low-voltage power circuit breaker switchgear described in IEEE Std C37.20.1(TM). These switching devices may be used in motor control or other repetitive duty applications and have the following characteristics: a) Drawout type, three-pole construction; b) Integral current-limiting fuses for short-circuit protection; c) Power operated, with integral or separately mounted overcurrent protective devices; In this standard, the term "LV-DPS device" denotes a low-voltage definite-purpose switching device conforming to the requirements of this standard.