System Sensor M500X Fault Isolator Module NOTIFIER FST-951-IV This smoke detector is an

This smoke detector is an analog

The Notifier APS2-6R 6

Includes dual LEDs for 360° visibility

Model OP121

Class B initiating circuit with end of line resistor

System Sensor M500X Fault Isolator Module NOTIFIER FST-951-IV This smoke detector is anThe M500X Fault Isolator modules enable part of the communications signaling line circuit to continue operating when a short circuit occurs. The System Sensor M500X Isolator Module is an automatic switch that opens when the line voltage drops below four volts. This module is rigorously designed and tested for electromagnetic compatibility and environmental reliability, in many cases exceeding industry standards.