标准摘要
[中文适用范围]: IEC 60947-1中涉及的一般规则的规定适用于本部分,如有特别要求。因此适用的一般规则的条款和子条款、表格、图形和附录通过参考 IEC 60947-1 来标识,例如,IEC 60947-1 的 4.3.4.1、IEC 60947-1 的表 4 或 IEC 60947-1 的附录 A。 1. 1.1 范围和对象 IEC 60947的本部分适用于额定电压不超过1000V交流或1500V直流的配电电路和电动机电路中使用的开关、隔离开关、隔离开关和熔断器组合装置。制造商应根据任何内置熔断器的相关标准规定类型、额定值和特性。本部分不适用于 IEC 60947-2、IEC 60947-4-1 和 IEC 60947-5-1 范围内的设备;然而,当属于本部分范围的开关和熔断器组合装置通常用于启动、加速和/或停止单个电动机时,它们还应符合附录 A 中给出的附加要求。杆开关包含在附录 C 中。安装在本部分范围内的设备上的辅助开关应符合 IEC 60947-5-1 的要求。本部分不包括爆炸性气体环境用电气设备所需的附加要求。注 1:根据其设计,开关(或隔离开关)可称为“旋转开关(隔离开关)”、“凸轮操作开关(隔离开关)”、“刀开关(隔离开关)”等。 注 2在本部分中,“开关”一词也适用于法语中称为“commutateurs”的装置,旨在修改多个电路之间的连接,尤其是用电路的一部分替换另一部分。注 3:一般来说,在本部分中,开关、隔离开关、隔离开关和熔断器组合装置将被称为“设备”。本部分的目的是说明 a) 设备的特性; b) 设备应符合的条件,参考 1) 正常使用中的操作和行为; 2)特定异常情况下的操作和行为,例如短路; 3)介电性能; c) 确认满足这些条件的试验以及这些试验所采用的方法; d) 设备上标记的信息或制造商提供的信息,例如目录中的信息。 [外文原描述]: IEC 60947-3:2008 applies to switches, disconnectors, switch-disconnectors and fuse-combination units to be used in distribution circuits and motor circuits of which the rated voltage does not exceed 1 000 V a.c. or 1 500 V d.c. This part does not apply to equipment coming within the scope of IEC 60947-2, IEC 60947-4-1 and IEC 60947-5-1; however, when switches and fuse-combination units coming into the scope of this part are normally used to start, accelerate and/or stop an individual motor they shall also comply with the additional requirements given in Annex A. The requirements for single pole operated three pole switches are included in Annex C. Auxiliary switches fitted to equipment within the scope of this part shall comply with the requirements of IEC 60947-5-1. This part does not include the additional requirements necessary for electrical apparatus for explosive gas atmospheres. This edition includes the following significant technical changes with respect to the previous edition: - alignment with the fifth edition of IEC 60947-1; - a switching operation without current allowed between making and breaking operation (Table 3); - increased number of operations for AC-23 allowed with agreement of the manufacturer (Table 3); - simplified test procedure amended, f) added to 8.3.2.1.3; - temperature rise test shall be made at the rated operational current /e instead of the conventional enclosed thermal current /the (8.3.3.1).
英文名称Low-voltage switchgear and controlgear - Part 3: Switches, disconnectors, switch-disconnectors and fuse-combination units