What is NO & NC switches – This is simply the state that the contact is in when something else is not affecting it.  If it is a relay then it is not energized.  If it is a switch, then it is off.  If it is a high limit such as a temperature alarm then the current temperature is below the limit. Normally open - Is a contact that does not flow current in its normal state.  Energizing it and switching it on will close the contact, causing it to allow current flow. Normally closed - Is a contact that flows current in its normal state.  Energizing it and switching it on will open the contact, causing it to not allow current flow. Difference between NO/NC Contacts & Switches- In a push button type switch (RX or LX), in which the contacts remain in one state unless actuated, the contacts can either be normally open (abbreviated "n.o." or "no") until closed by operation of the switch, or normally closed ("n.c. or "nc") and opened by the switch action. Current locksets that offer an RX or LX switch can operate in either state, but the product you are tying them into usually dictates which type of state is required. Follow Us On : Google Reviews : https://goo.gl/LxpEsU Facebook : https://www.facebook.com/wscubetech.india Twitter : https://twitter.com/wscube Linkedin : https://www.linkedin.com/company/wscube-tech Google + : https://plus.google.com/+wscubetechjodhpur Youtube : https://www.youtube.com/c/wscubetechjodhpur Website : http://wscubetech.com
