选用ABB软启动器时应考虑ABB软启动器与短路保护电器的协调配合。通常选用熔断器作为短路保护电器，熔断器应安装于ABB软启动器的电源一侧（综合ABB软启动器除外，其内部已装有熔断器，一般ABB软启动器应按制造厂要求选配合适的熔断器）.熔断器不应代替ABB软启动器分断正常工作时**过载电流及以下的所有电流（包括电动机的堵转电流），但应能分断安装点的预期短路电流。
一般按ABB软启动器额定电流的2.5倍左右选择熔断器，以保证电动机启动时不发生误动作。此外，熔断器和热继电器的保护特性的交点应选择适当。
ABB 软起动器
选用电磁ABB软启动器时还应注意以下问题：
①、根据使用环境确定ABB软启动器是开启式（无外壳）的还是保护式〔有外壳）的。
②、根据线路要求确定ABB软启动器是可逆式的或不可逆式的.是有热保护的还是无热保护的。
③、根据被控制电动机的功率确定用哪一级的ABB软启动器，而不是根据电动机的额定电流选择。产品样本中所列的额定电流是从发热方面规定的。如果是保护式产品.由于散热条件较差，就宜使ABB软启动器在额定电流方面有点裕度。
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