SHIELD S-A4045 Switch Monitor Input/Output Module

The SHIELD S-A4045 is an addressable switch monitor input/output module designed to monitor potential-free dry contacts and control auxiliary equipment on a fire alarm loop. Functioning as a dual-purpose interface within an addressable fire safety network, it combines a supervised input channel to monitor external devices—such as flow switches, pressure switches, and tamper switches—with a volt-free relay output to trigger auxiliary systems like smoke dampers, door holders, and fan shutdowns. Its input circuit is continuously supervised for open-circuit and short-circuit fault conditions, while the output relay provides dependable control switching upon receiving commands from the fire panel. Equipped with electronic soft-addressing, low standby current consumption, and onboard status LED indicators for visual diagnostics, the S-A4045 delivers complete field monitoring and control integration for SHIELD fire alarm systems.