Which statement best describes the function of ADS?

• A. It ensures immediate disconnection of supply when a fault is detected
• B. It gradually reduces voltage when a fault occurs
• C. It triggers an alarm but keeps supply
• D. It disconnects only after a fuse blows

Answer: (A)

ADS is about isolating the circuit as soon as a fault is detected. Its purpose is to stop fault current immediately, protecting people and equipment from dangerous energy and reducing the risk of fire. Because faults like arcs can escalate quickly, the system trips right away rather than waiting for other protective devices to act. It doesn’t just reduce voltage slowly, and it doesn’t keep the circuit alive while raising an alarm. It also isn’t meant to wait for a fuse to blow—the goal is fast disconnection to isolate the fault.