线式软启动器和内置旁路软启动器的区别为：旁路接触器不同、启动不同、主回路切除不同。
一、旁路接触器不同
1、在线式软启动器：在线式软启动器无需旁路接触器，从启动到运行中在线保护。
2、内置旁路软启动器：内置旁路软启动器是把旁路接触器安装在旁路软启动器里面了。
二、启动不同
1、在线式软启动器：在线式软启动器只能同时启动一台电机，做到一机一用。
2、内置旁路软启动器：内置旁路软启动器可同时启动多台电机，做到一机多用。
三、主回路切除不同
1、在线式软启动器：在线式软启动器不可以根据设定的时间启动从电机主回路切除。
2、内置旁路软启动器：内置旁路软启动器可以根据设定的时间启动从电机主回路切除。
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