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System Sensor MDL3R Sync Circuit Module, 12/24V, Red
System Sensor MDL3R Sync Circuit Module, 12/24V, Red

System Sensor MDL3R Sync Circuit Module, 12/24V, Red

Manufacturer:System Sensor
Manufacturer Part#:MDL3R
Our Part#:MDL3R
Stock Status: Call for Availability
Retail Price:$177.49
Your Savings:$62.12(35%)
Your Price:$115.37


System Sensor







Feature 5


The System Sensor MDL3R & MDL3W are direct replacements for the discontinued MDL and MDL-W


  • Two-wire operation from module to the devices
  • Silences horns and chimes over a two-wire loop
  • Synchronizes strobes at 1 Hz
  • Synchronizes horns and chimes to temporal 3 pattern
  • Patented technology
  • Interconnects modules for multiple zone synchronization
  • Module controls two Style Y (Class B) circuits or one Style Z(Class A) circuit
  • New NAC slave feature enables the interconnection of slavemodules over a supervised NAC loop


The MDL3 Module is designed to work with the SpectrAlert and SpectrAlert Advance series of notification appliances to provide a means of synchronizing the temporal-coded horns and chimes, synchronizing the one-second flash timing of the strobe, and silencing the horns and chimes of the horn/strobe and chime/ strobes combination over a two-wire circuit while leaving the strobes active.

The Sync-Circuit module is designed to power and synchronize either two 3-amp circuits wired in Class B, or one 3-amp circuit powered as Class A. Should more than two zones require synchronization, additional modules can be added by interconnecting the "slave" input and output terminals between modules.


Physical Specifications
Dimensions 5 1/4" L x 5 1/4" W
Mounting 4 11/16" x 4 11/16" x 2 1/8" back box
Indoor Operating Temperature 32° to 120°F (0° to 49°C)
Electrical/Operating Specifications
Operating Voltage 12 or 24VDC and FWR unfiltered
Operating Voltage Range (12V) 8.5 to 17.5VDC
Operating Voltage Range (24V) 16.5 to 33VDC
Maximum Load on Loop 3A per zone

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