SD 500 ARM Relay Module: Complete Guide to Features, Wiring, and Applications
When a fire alarm system detects smoke, detection alone is never enough. Fans must shut down, doors must release, dampers must close, and elevators must recall, and all of these actions happen through relay modules. The SD 500 ARM is the addressable relay module that makes this coordinated response possible on Silent Knight IntelliKnight fire alarm systems. In this complete guide, we will walk through what the SD 500 ARM does, how its Form C contacts are wired, which applications it serves best, and the installation practices that keep it running reliably for years. Whether you are a fire alarm contractor, a facility manager, or a system integrator planning an upgrade, this guide gives you everything you need to specify and install this module with confidence. What Is the SD 500 ARM? The SD 500 ARM is an addressable relay module manufactured by Silent Knight (a Honeywell brand). It allows an IntelliKnight fire alarm control panel to switch discrete electrical contacts by code c...
