What circuit does the disconnect switch interrupt in a suppression system?

• A. Releasing circuit to the suppression system
• B. Main power supply to the building
• C. Alarm signaling loop
• D. Ground fault circuit

Answer: (A)

The disconnect switch is placed in the releasing circuit—the path that sends the release command to the agent-dispensing devices. Opening it isolates the releasing path so the system cannot actuate and discharge the extinguishing agent during maintenance or a fault. It intentionally does not cut the building’s main power, nor does it disable the alarm loop or address a ground fault circuit, which are separate circuits. The releasing circuit is the correct one to interrupt to prevent unintended discharge while work is performed.