Siemens XTRI-S (S54370-B3-A1) Module Silent Knight SK-RELAY • Green LED indicates normal

• Green LED indicates normal operation

Single-Mode Duplex 4120 Fiber Media Card

Security systems

selectable-output speaker strobes and dual-voltage evacuation speakers meet virtually any outdoor application requirement

Siemens XTRI-S (S54370-B3-A1) Module Silent Knight SK-RELAY • Green LED indicates normalSiemens XTRI (S54370 B3 A1) modules support two operation modes: polarity insensitive mode and isolator mode The module can be wired for either mode (refer to Figures 8 through 13). During the isolator mode, the builtin dual isolators will work at both sides of the module to isolate the line short in front or behind the module.