Edwards Signaling SB4 S853 Fire Alarm Subassembly is a dedicated subassembly for Edwards fire alarm systems, described as a Smoke Detector Base. The SB4 S853 subassembly is the base component identified by the model for the smoke detector/thermostat portion of the system. It is used in installations that employ the SB4 S853 configuration and is referred to by its model and function as a subassembly.
