Siemens S54370-B1-A1 Relay Version Intel Interface

Siemens XTRI-R S54370-B1-A1 is a single‑input intelligent interface module with an internal relay, designed to connect a dry-contact device to Desigo Fire Safety and Cerberus PRO fire alarm systems. The Relay Version (S54370-B1-A1) monitors a normally open or normally closed contact and uses an isolated interface to the FACP loop, helping protect the network from faults while providing a controllable switching path via the built‑in relay. This XTRI-R module is part of Siemens’ XTRI family of addressable interface modules that integrate external devices into the fire‑alarm network, compatible with Siemens FACPs such as FC2025/FC2050 and Cerberus PRO FC922/FC924/FV922/FV924 systems. Typical applications include monitoring door contacts or other dry-contact sensors and using the relay to drive an auxiliary circuit or local annunciation, all while maintaining addressable supervision within the Desigo/Cerberus ecosystem. The S54370-B1-A1 designation identifies the relay-enabled, single-input variant of the XTRI‑R line, optimized for reliable interfacing of external devices to the intelligent fire‑safety network.