MR-2351-LD-RA Intelligent Fire Alarm Control Unit

The MR-2351-LD-RA is an intelligent single loop fire alarm control unit that supports up to 126 addressable points.


The MR-2351-LD-RA is a single loop fire alarm control unit that supports up to 126 points. The system can be expanded to a three loop 378 point system with the addition of an ALC-252 Dual Loop Controller Module. The MR-2351-LD-RA is equipped with a two line by 20 character back-lit LCD display, numerical keypad, an integrated UDACT/Digital Communicator and space for up to 64 zones of LED annunciation (requires optional RAX-332 modules). The LCD display allows for 32 characters to be configured for user defined messages. In addition the MR-2350 Series family also includes remote LED and LCD annunciators.

The MR-2351-LD-RA is ideal for both new and retrofit applications. Designed for small to medium commercial, institutional and industrial occupancies, these panels are powerful enough to meet today’s installation demands.

The MR-2351-LD-RA is configurable by the keypad for onsite programming or by a PC for both onsite and remote programming. Easy to install and simple to operate and configure, the MR-2351-LD-RA enables the installer to configure the system to meet their specific requirements. The MR-2351-LD-RA is equipped with a 5.5 Amp power supply, auxiliary resettable smoke power supply (300mA max.), an interface for a Remote Trouble Indicator (SRTI-200) and an RS-485 interface for remote LCD and LED annunciators.

The MR-2351-LD-RA comes complete with a red door, black enclosure, durable CAT-30 lock and key and space to mount up to 18 AH batteries.

Comes With

  • Two Line LCD Display
  • 1 Intelligent Loop (126 Devices)
  • 4 Indicating Circuits(1.7 Amps) Class B (Style Y)
  • 2 Line UDACT Digital Communicator & Modem
  • Supports Multiplexed LCD & LED Remote Annunciation
  • Alarm & Event Logs
  • 5 Amp Power Supply (Signal & Aux Supply)
  • Configurable Via Front Panel, Laptop or Remote Dial Up
  • Provision to expand to 378 points (Requires ALC-252)
  • Provision to add two RAX-332
  • Red Door and Black Enclosure


  • Single intelligent SLC Loop that supports 126 points. Expandable to 378 points with ALC-252 Dual Loop Controller Module
  • Points can be any combination of Intelligent Sensors or Modules
  • Supports Photoelectric Sensors, Variable Heat Sensors and Multi–Sensor (Heat/Photo)
  • Equipped with 2 line by 20 character back-lit LCD display, numerical keypad and an integrated UDACT/ Digital Communicator
  • LCD display allows for 32 characters to be configured for user defined messages
  • Digital Communicator can be configured for DACT or UDACT mode of operation
  • Space for up to 64 zones of LED annunciation with optional RAX-332 programmable LED annunciator
  • Configurable via the front panel, PC Configurator, or remote dial up through the built-in modem
  • Sensors can be configured as Alarm, Verified Alarm, Latching or Non-Latching Supervisory, Monitor and Trouble-Only
  • Modules can be configured as Alarm, Latching Supervisory, Non-Latching Supervisory, Water Flow, Monitor, Trouble, Fire Drill Switch, Signal Silence Switch, Aux Disconnect Switch and Buzzer Silence Switch
  • Base panel is equipped with Four Class “B” (Style “B”) indicating circuits which may be configured as Class “A” (Style “Z”) using a Class “A” signal converter module
  • Indicating Circuits may be configured as Silenceable or Non-Silenceable for both signals and strobes
  • Built-in sync protocols for the following strobe manufacturers: Mircom, Amseco, System Sensor, Gentex, Faraday and Wheelock
  • Relay contacts for Common Alarm, Auxiliary/ Alarm (Disconnectable), Common Supervisory and Common Trouble
  • Configurable Signal Silence Inhibit, Auto Signal Silence and One-Man Walk Test
  • Subsequent Alarm, Supervisory, and Trouble operation
  • RS-485 Interface for Remote LED and LCD Annunciators
  • Positive Alarm Sequence
  • Two event history logs comprised of a 200 event alarm log for alarm related events and a 200 event general log for all other events
  • 5.5 Amp Power Supply
  • Optional City Tie/Polarity Reversal module

Product Documents