接点闭合
- 网络contact closure
接点闭合-
新接点闭合系统无需任何焊接。
New contact closure systems do not require any soldering .
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先合后断接点，桥接点闭合触点；断路器触点；符号3；符号4
Close-before-open contact Make Contact ; Break Contact ; Symbol 3 ; Symbol 4
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内部由浮子及两个干簧接点构成，接点闭合将报警信号或切除信号通过接线端子输出。
The inner is composed of float and two spring contacts and the contact closing makes alarm signal or cutting signal output by the connection terminal .