Three Input Device

Product Overview

The Ampac Three Input Device is designed to interface to a variety of plant control equipment such as sprinkler flow switches and fire fan control systems.

The Three Input Device incorporates three (3) monitored switched inputs. Each input can be used to supervise one or more normally open contacts connected to a single pair of cables with monitoring provided for both open and short circuit fault conditions. The Input circuits incorporate de-bounce circuitry for enhanced noise rejection and are protected against high transient voltages.

The Ampac Three Input Device is loop powered and includes bi directional isolation circuitry for protection against detection loop short circuits. On board LED status indication is provided for service and commissioning purposes, a feature that can be deactivated during normal operation to reduce the current draw on the system.

Two packaging options are available. The ‘DIN Mount’ version enables the device to be mounted onto standard 35mm DIN rail or screwed direct to the back pan of a larger enclosure while the ‘Enclosed’ version allows the device to be surface mounted to a wall.


  • 3 x Independent Monitored Inputs
  • Loop Powered
  • Compatible with XP95 & Discovery Protocol
  • Built In Short Circuit Isolator
  • Low Power Consumption
  • Diagnostic LED Indications
  • Surface Mount Enclosure
  • DIN Rail Mount Option



Operating Voltage

17 – 28V DC

Max Current at 24V DC

Quiescent Current

All Inputs Active




Operating Temp.

-20°C +70°C


0 to 95% Non-condensing


DIN Mount


(H x W x D)

75mm x 144mm x 25mm

150mm x 200mm x 52mm


Grey ABS

IP Rating

IP44 (indoor use)

Item Numbers


Three Input Device DIN Mount


Three Input Device Enclosed