Siemens S54370-B1-A1 Addressable Switch Interface Module

The Siemens XTRI-R S54370-B1-A1 Addressable Switch Interface Module is a compact, single-input interface within the XTRI family that provides an addressable input to a fire alarm or automation loop and includes a relay output. Designed for 32 VDC operation, it connects a single dry-contact device to the Desigo Fire safety or Cerberus PRO loop while preserving loop integrity through its isolation features. This module (part S54370-B1-A1) is described as a Single Input Module with Relay, enabling a supervisory connection that can trigger a relay in response to an input event, making it suitable for monitoring door sensors, water flow switches, or other field devices in networked life-safety systems. It integrates with Siemens' H- and X-series intelligent devices ecosystem and is compatible with Desigo FC2025/FC2050/FV2025/FV2050 and Cerberus PRO FC922/FC924/FV922/FV924 configurations, allowing seamless integration into modern building fire alarm architectures. Common applications include remote monitoring of a single switch or valve control within a larger addressable system, where a local relay output needs to be actuated based on an input change while maintaining isolation from the loop for fault containment and reliability.