If a limit switch is used to turn off a circuit after completion of a step, what is that circuit called?

• A. Event energizing circuit
• B. Event de-energizing circuit
• C. Sequence stopping circuit
• D. Limit stop circuit

Answer: (B)

When a limit switch is used to shut off a circuit after a step completes, it creates an action that removes power at that moment. This is an event de-energizing circuit—the switch detects the end of the step and interrupts the electrical supply, causing the control circuit to stop. It’s the opposite of an energizing circuit, which would apply power to start or continue the step. The other terms don’t reflect the electrical action as precisely: a sequence stopping circuit is vague about how the stop is achieved, and a limit stop circuit implies a mechanical stop rather than the electrical interruption. So the proper description is that this setup is an event de-energizing circuit.