switches - "Normally closed" switch: does it use more power than a "Normally open" for a low-power battery-powered ATtiny project? - Electrical Engineering Stack Exchange
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What is Normally Open and Normally Close switch ? How to implement logic gates with NO and NC switch? - Industrial Automation - Industrial Automation, PLC Programming, scada & Pid Control System
![Graphical symbol for Normally Open Held Closed limit switch - Codes and standards general discussion - Eng-Tips Graphical symbol for Normally Open Held Closed limit switch - Codes and standards general discussion - Eng-Tips](https://res.cloudinary.com/engtips/image/fetch/w_800,c_lfill,q_auto,f_auto,g_faces:center/https://i.postimg.cc/J4kXZPGG/ISA-5-1-2009-electrical-switches.jpg)