Which displayed electrical symbol represents a normally closed contact?

A normally closed contact is represented by a specific electrical symbol that signifies the state of the contact when there is no power applied to the circuit. In this condition, the normally closed contact allows current to pass through, completing the circuit. This is crucial for applications where an electrical signal needs to be active until a specific event occurs that opens the contact.

The symbol for a normally closed contact typically depicts two parallel lines that make up the contacts with a representation that indicates they are in a closed position. When the controlling device is not energized, the circuit remains closed, allowing current to flow. This is a fundamental concept in relay logic and control systems, where understanding the state of contacts is vital for designing and troubleshooting electrical circuits.

The other symbols represent different states or types of contacts. An open contact signifies that there is a break in the circuit, a normally open contact indicates that the circuit is only closed when the controlling device is engaged, and a momentary contact is a temporary condition that closes the circuit only while it is being pressed or activated. Understanding these differences helps in reading and interpreting schematics accurately.