IEC 60644:2009主要适用于在50 Hz和60 Hz交流系统上直接在线启动的电机使用的保险丝。标准化时间-电流特性，以制定有关测试的附加脉冲耐受要求，并为电机使用的保险丝的选择提供指导。注:根据本规范的熔丝应符合IEC 60282-1的要求。与上一版相比，主要变化如下: -更新规范性参考文献； -更新数字。

IEC 60644:2009 applies primarily to fuse-links used with motors started direct-on-line on alternating current systems of 50 Hz and 60 Hz. Standardizes time-current characteristics to formulate additional pulse withstand requirements regarding testing and to give guidance for the selection of fuse-links to be used with motors. Note: Fuse-links according to this specification should comply with the requirements of IEC 60282-1. The main changes with regard to the previous edition concern the following:
- update of the normative references;
- renewal of the figures.