D4120 System Sensor D4120 4-Wire Duct Smoke Detector

4 wire photoelectric duct smoke detector. Square or rectangular footprint. 24 or 120 volts. 100 to 4000 FPM. Max temp 158F. 1 SPST N/O alarm, 2 SPDT auxilliary and 1 SPST N/O supervisory contacts.


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