What is represented by the component Limit Switch N.C.H.O.?

• A. Normally Closed, Held Open
• B. Normally Open, Held Closed
• C. Normally Closed
• D. Normally Open

Answer: (A)

The designation "Limit Switch N.C.H.O." refers to the configuration of the switch. The "N.C." stands for "Normally Closed," indicating that the switch is in a closed position when it is not actuated. The "H.O." means "Held Open," which suggests that, under normal conditions, the switch remains in a closed state until it is intentionally opened or actuated.

In this context, the correct interpretation reflects that the limit switch operates by being normally closed (allowing current to flow) and is held open when a specific condition (like a mechanical actuation) occurs. This design is often used in safety systems and controls where the default state is to permit operation unless an event happens to change that state.

Understanding these definitions is crucial for interpreting switch operations in electric circuits and control systems. This context is essential for anyone studying or working in fields involving automation or electrical engineering, as it helps ensure that systems operate safely and as intended.