Allen-Bradley 809S-BB100A1 is a Bulletin 809S current-monitoring relay from Rockwell Automation that provides under- and over-current detection to protect motor circuits. As part of the 809S family, it adds supplementary protective functions that can be applied to motor-control applications and integrates with Allen-Bradley PLCs and other industrial control equipment. This device is used to guard motors and related wiring from abnormal current conditions by signaling or triggering protective actions when limits are exceeded.
