What type of Flow Switch is categorized as Normally Closed?

• A. Flow Switch N.O.
• B. Timed Contact N.O.T.O.
• C. Flow Switch N.C.
• D. Thermal Switch N.O.

Answer: (C)

A normally closed flow switch is designed to remain in a closed position when there is no flow detected. This means that the electrical circuit it controls is completed, allowing current to pass through. When the flow exceeds a predetermined threshold, the switch activates, opening the circuit and stopping the flow of current.

This configuration is particularly useful for safety applications where it is critical to maintain power to a system unless a specific condition (in this case, the flow of liquid) is met. The ability to maintain a closed state during normal conditions ensures that equipment can function correctly without unnecessary interruptions unless a fault or specific condition arises.

In contrast, other options represent either normally open configurations, which allow current to flow only when flow is detected, or types of switches that would not classify as flow switches at all. Understanding the role of a normally closed flow switch in a system can help ensure proper application in safety and operational integrity within various industrial settings.