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supervisory relay
— 4020 Series fire alarm control panels
Each HS-NCM can accommodate up to two node addresses
its small size and weight allow it to be install without rigid mounting
these detectors are designed to provide open area protection and to be used with compatible UL-listed control panels only
Johnson Controls M302MJ Addressable Monitor Module Detector supervisory relayJohnson Controls M302MJ Addressable Monitor Module 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.
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