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it provides a two wire initiating circuit for normally open contact fire alarm and security devices
optical sensing chambers
The M502M has a panel controlled LED indicator
Average Operating Current: 400 µA
NIB! Notifier FZM-1A Interface Monitor Module fst-751r it provides a two wireFZM 1(A) is a standard sized module that monitors and supervises compatible two wire, 24 volt, smoke detectors on a Style D (Class A) or Style B (Class B) circuit. The FZM 1(A) Interface Module is intended for use in intelligent, addressable systems, where the individual address of each module is selected using built in rotary switches. This module allows intelligent panels to interface and monitor two wire conventional smoke detectors. It transmits
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