Fireboy Automatic Engine Shutdown System (3) 10 Amp Controls . Responds automatically, when a Fireboy system discharges, to shut down engines, blower systems and generators. Circuitry selection depends on system voltage (12V or 24V) and the number of items that would need to be shutdown, including engines, generators, blowers, etc. Required on all diesel engine applications, optional for all other engines. All systems are solid state for greater reliability. Display unit includes an integrated alarm/horn, charged/discharged lights, and an override switch for restart control of auto-shutdown.