本标准涵盖了封闭式直流电源断路器的以下类型、首选额定值和测试要求:a）单极或双极功能结构的固定式或抽出式断路器b）额定最大电压高达3200 V c）手动或电动断路器 d） 带或不带过电流跳闸装置 注——在本标准中，术语a的使用？断路器时代？被认为是指？封闭式直流电源断路器。A.

This standard covers the following types, preferred ratings, and testing requirements of enclosed dc power circuit breakers: a) Stationary or drawout type of one- or two-pole functional construction b) Having rated maximum voltages of up to 3200 V c) Manually operated or power operated d) With or without overcurrent trip devices NOTE--In this standard, the use of the term "circuit breaker" is considered to mean "enclosed dc power circuit breaker."