DS200TBQDG1AEE 仓库现货 欢迎冾谈 

3500/32 125720-01
3500/33 149992-01
3500/40M 125680-01
3500/40M 135489-01
3500/42M 140471-01
3500/42M 128229-01
3500/45 139554-01
3500/50 133442-01
3500/60 136711-01
3500/60 133819-01
MTL838B
3500/92 133323-01
3500 136719-01
JAMSC-B2602AV

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描述

多机床不是用控制开关,而是用按钮开关操作的。利用按钮的自动复位作用和接触器的自锁作用,可不必另设零压保护继电器。如图2.27所示,当电源电压过低或消失时,接触器KM释放,KM的主、辅触点同时打开,使电动机电源切断并失去自锁。当电源恢复正常时,必须操作人员重新按下启动按钮SB2,才能使电动机启动。所以象这样带有自锁环节的电路本身就具有零压保护作用。

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