Fireboy-Xintex Engine Shutdown - 5 Circuit w/20A Relays - Round Display [ES-5000-01]Engine Shutdown 5 Circuit with 20A Relays Round Display If a fire breaks out aboard a diesel powered vessel, the engine(s) must be shut down prior to or during the discharge of a suppression system to effectively extinguish the fire. Continued engine operation may remove the agent, lowering the concentration required to effectively extinguish the fire, making an Engine Shutdown System necessary. Consisting of a Shutdown Control Module and Helm Display