Soteria Twin Input Output Unit

Product Overview

The Soteria Twin Input Output Unit provides the function of two Input Output Units within one enclosure. The two units are electrically independent of each other. There is a DIL switch on each unit to set the address.
Both input output units in the enclosure provide supervision of one or more normally open volt free contacts connected to a single pair of cables and a set of changeover relay output contacts.


  • Improved design for ease or wiring, meaning faster installation
  • Short circuit isolator
  • Address range 1 – 126
  • Compatibility with XP95 and Discovery protocol
  • Failsafe mode (meets BS 7273-4 requirements)


Supply Voltage (Vmin—Vmax)

17 to 35V dc


5-13V peak to peak

Power-up surge current

900?A per Input Output unit

Quiescent current

500?A per Input Output unit

Max Current LEDs On

3.5mA per Input Output unit

Max current LEDs disabled

500?A per Input Output unit

Relay output contact rating

1A at 30V dc or ac

Isolator data

Refer to short-circuit isolation datasheet PDS201-9001

Operating Temperature

-40°C + 70°C


0% to 95% RH (no condensation or icing)

Vibration, impact and shock

EN54-17 & EN54-18

Standards & Approvals

EN54-17, EN54-18, CPR and LPCB


60mm height x 150mm width x 90mm depth



Item Numbers


Soteria Twin Input Output Unit