In a normally closed relay contact, what happens when the coil is energized?

In a normally closed relay contact, what happens when the coil is energized?

• A. Energizing the coil opens the normally closed contact.
• B. Energizing closes the normally closed contact.
• C. Energizing has no effect on the contact.
• D. Energizing permanently fuses the contact.

Answer: (A)

Relays switch their contacts based on whether the coil is energized. For a contact that is normally closed, the circuit is complete when the coil is not energized. Energizing the coil creates a magnetic pull that moves the armature away from the fixed contact, breaking the connection and opening the circuit. When the coil is de-energized, a spring or mechanical return brings the armature back to the closed position, restoring the connection. So energizing the coil opens the normally closed contact.

Relays switch their contacts based on whether the coil is energized. For a contact that is normally closed, the circuit is complete when the coil is not energized. Energizing the coil creates a magnetic pull that moves the armature away from the fixed contact, breaking the connection and opening the circuit. When the coil is de-energized, a spring or mechanical return brings the armature back to the closed position, restoring the connection. So energizing the coil opens the normally closed contact.