Is NC Normally Open or Normally Closed?
1 Answers
NC is the symbol for normally closed, which stands for 'normally close' in English. It refers to a contact that remains closed and conductive when not energized, commonly known as a normally closed contact. The symbol for normally open is NO, which stands for 'normal open' in English. Below is more information about normally closed and normally open contacts: 1. The normally closed contact is a specialized term in electrical engineering, referring to a relay contact that remains closed when the coil is not energized. Components such as limit switches and pressure relays, when not subjected to external force, have contacts in the open state referred to as normally open contacts, while those in the closed state are called normally closed contacts. 2. When the relay coil is not energized, meaning the switch supplying power to the relay coil is in the off state, the relay's normally open contacts remain open, and the normally closed contacts remain closed. Under normal conditions, contacts that are in the open state are called normally open contacts. When the coil is energized, the normally open contacts close, and the normally closed contacts open. 3. For auxiliary switches configured on electrical devices that are linked to the main switch, when the main switch is closed, the auxiliary switch also closes. Both normally open and normally closed contacts are essential parts of contactors and relays, especially in relay PLCs.
