6AV6 643-0CD01-1AX1 SIEMENS 触摸屏

1756-L61S
1756-IB16ISOE
2711P-B15C4D8
1756-L72B
6181P-17TPXP
TCSESB083F23F0
1756-RM
DSCDP334-421-000
390410-0-YE-T

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描述

当线圈通电时,电磁铁产生磁力,吸引衔铁,使常闭触点断开,常开触点闭合。线圈电流消失后,复位弹簧使衔铁返回原来的位置,常开触点断开,常闭触点闭合。图l-2b是继电器的线圈、常开触点和常闭触点在电路图中的符号。一只继电器可能有若干对常开触点和常闭触点。在继电器电路图中,一般用相同的由字母、数字组成的文字符号(如KA2)来标注同一个继电器的线圈和触点。

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