软启器采用三相反并联晶闸管作为调压器，将其接入电源和电动机定子之间。这种电路如三相全控桥式整流电路。使用软启动器启动电动机时，晶闸管的输出电压逐渐增加，电动机逐渐加速，直到晶闸管全导通，电动机工作在额定电压的机械特性上，实现平滑启动，降低启动电流，避免启动过流跳闸。待电机达到额定转速时，启动过程结束，软启动器自动用旁路接触器取代已完成任务的晶闸管，为电动机正常运转提供额定电压，以降低晶闸管的热损耗，延长软启动器的使用寿命，提高其工作效率，又使电网避免了谐波污染。软启动器同时还提供软停车功能，软停车与软启动过程相反，电压逐渐降低，转速逐渐下降到零，避免自由停车引起的转矩冲击。
斯达森SEC18C370软启动SEC18C790XM6
斯达森SEC18C370软启动SEC18C790XM6
SEC18C080H02
SEC18C100H02
SEC18C125H02
SEC18C160H02
SEC18C200H02
SEC18C250H02
SEC18C315H02
SEC1800H02
SEC18C500H02
SEC18C630H02
SEC18C800H02
SEC18C990H02
SEC18C040H03
SEC18C080H03
SEC18C100H03
SEC18C125H03
SEC18C160H03
SEC18C200H03
SEC18C250H03
SEC18C315H03
SEC1800H03
SEC18C500H03
SEC18C630H03
SEC18C800H03
SEC18C990H03
SEC18C040H04
SEC18C080H04
SEC18C100H04
SEC18C125H04
SEC18C160H04
SEC18C200H04
SEC18C250H04
SEC18C315H04
SEC1800H04
SEC18C500H04
SEC18C630H04
SEC18C800H04
SEC18C990H04
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