Simplex 4090-9117 Module Addressable Power IsolatorUnder normal conditions, the 4090 9117 Addressable Power Isolator provides continuity between ports. In the event of a short circuit, or if requested from the FACU, the isolator opens a two pole electronic switch, isolating both power circuit conductors. Isolators power up in isolation mode and are directed to connect by the FACU. If the output wiring is acceptable, the isolator connects to the rest of the circuit. If the output wiring is shorted, the