电器附件.家用电器和类似电器装置过电流保护断路器

[中文适用范围]： 广泛，涉及住宅、商业及轻工业场所的配电系统，是保障电气安全运行的重要技术文件之一。 ***此介绍可能不准确，请注意参考原文。 [外文原描述]： Applies to a.c. air-break circuit-breakers for operation at 50 Hz or 60 Hz, having a rated voltage not exceeding 440 V (between phases), a rated current not exceeding 125 A and a rated short-circuit capacity not exceeding 25 000 A. These circuit-breakers are intended for the protection against overcurrents of wiring installations of buildings and similar applications; they are designed for use by uninstructed people and for not being maintained. Also applies to circuit-breakers having more than one rated current, provided that the means for changing from one discrete rating to another is not accessible in normal service and that the rating cannot be changed without the use of a tool.