Which component initiates the extinguishing discharge by closing the electrical circuit?

• A. Agent discharge switch
• B. Pyrotechnic charge
• C. Hydraulic valve
• D. Electrical relay

Answer: (A)

The key idea is that the discharge is started by completing an electrical path to the initiating device. The component that does this is the agent discharge switch. When it is activated, it closes the electrical circuit and sends current to the initiator (the pyrotechnic charge). The charge then actuates the discharge path, releasing the extinguishing agent. The pyrotechnic charge provides the energy to push the agent out, but it doesn’t close the circuit by itself. A hydraulic valve isn’t involved in closing an electrical circuit, and a relay, while it can control circuits, isn’t the element that directly initiates discharge by closing the switch.