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Morrison Bros 918AC System Interface


The 918AC System Interface is an AC-powered console designed to monitor 1 to 4 simple input switch devices and provide both audible and visual indication when an input switch is activated.  In addition, the 918AC has the optional capability to add 1 to 4 configurable relay outputs to interface with remote audible and visual indicators or other external simple switch-activated devices.

Expandability with Plug-n-Play Capabilities

  • Intrinsically safe input modules expandable up to 4 input channels
  • Electromechanical output modules expandable up to 4 output relays
  • Input and output modules can be purchased separately


  • Audible alarm ON/OFF selectable by channel
  • Auto silence ON/OFF selectable by channel
  • Normally open (NO) or normally closed (NC) selectable on input and output
  •  Output relay activation selectable to one or more input channels
  •  Fail safe mode selectable to indicate power outage at console
  •  Change lens color: red (standard), amber, or green


  • UL/cUL 913 Listing for Ordinary Location with Hazardous Location Intrinsically 
  • Safe Input Circuits for Class I, Div 1, Group D.
  • Florida DEP EQ-834
Weight 6 lbs
Dimensions 7 × 5 × 3 in

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