What is the configuration of a Float Switch that is Normally Closed?

• A. Float Switch N.O.
• B. Pressure Switch N.O.
• C. Pushbutton N.O.
• D. Float Switch N.C.

Answer: (D)

The configuration of a float switch that is described as Normally Closed (N.C.) means that in its default state—when the float is not activated—the switch remains closed, allowing electrical current to flow through.

This type of switch is typically used in applications where it is essential to maintain continuity until a certain level is reached. For example, when the liquid level rises to a designated point, the float will lift, causing the switch to open, which then interrupts the current. This behavior is crucial for applications like low-level alarms or pumping systems, where you want the system to function continuously until the specified level is achieved.

The other configurations mentioned in the options refer to Normally Open (N.O.) switches, where the circuit is open by default and only closes when activated. Since the question specifically asks for a Normally Closed configuration, the correct answer points directly to a Float Switch N.C., which aligns perfectly with the requirements of the application described.