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Protege DIN Rail
8 Input / 4 Output Expander


The Protege DIN Rail 8 Input 4 Output Expander extends the number of inputs by 8, allowing monitoring of a wide range of EOL capable or open contact sensors; and extends the number of outputs by 4, featuring high current Form C relays for controlled automation of building systems including lighting and HVAC.

  • 8 monitored inputs
  • Connect any combination of normally closed or normally open inputs, configurable per input
  • Four-state input alarm using resistors to provide short, alarm, closed and tamper conditions
  • 4 Form C relays capable of switching resistive loads up to 7 Amps


Extending the Protege system with local inputs and outputs allows convenient, cost-effective expansion with the following additional benefits:

  • 8 inputs can be assigned to any 4 areas in the system each being processed using different options or features
  • 4 multiple-function outputs available for use in any programmable output configuration
  • Outputs can be configured to automatically turn on or resume their previous state upon restoration of power or communication failure
  • Address configuration is achieved using the address programming feature of the Protege System Controller.

Device power is supplied from a 12VDC input. Ultra low current requirements ensure cost-effective power distribution.

The input/output expander has 4 programmable Form C relay outputs which can be used to activate bell sirens, lighting circuits, door locks, relay accessory products and other automation points.

A single RS-485 communication interface port used for all network communication functions and interconnection to other modules.

The input/output expander features comprehensive diagnostic indicators that can aid in diagnosing faults and conditions. LED indicators include:

  •  Status indicator
  • Fault indicator
  • Power indicator
  • Input indicators
  • Output indicators

Utilizing the latest flash technology and high performance communication mediums, the firmware can be updated via the Protege interface.


Ordering Information
PRT-IO84-DIN Protege DIN Rail 8 Input/4 Output Expander
Power Supply
DC Input Voltage 11-14VDC
DC Output Voltage (DC IN Pass-Through) 10.45-13.85VDC 0.7A (Typical) Electronic Shutdown at 1.1A
Operating Current 80mA (typical)
Low Voltage Cutout 8.7VDC
Low Voltage Restore 10.5VDC
RS-485 Isolated module network
Outputs 4 FORM C Relays - 7A N.O./N.C. at 30 VAC/DC resistive/inductive
Inputs 8 (10ms to 1hr input speed programmable)
Trouble Inputs 16
Dimensions (L x W x H) 156.8 x 90 x 60mm (6.17 x 3.54 x 2.36")
Net Weight 310g (10.9oz)
Gross Weight 380g (13.4oz)
Operating Conditions
Operating Temperature -10° to 55°C (14° to 131°F)
Storage Temperature -10˚- 85˚C (14˚ - 185˚F)
Humidity 0%-93% non condensing, indoor use only (relative humidity)
Mean Time Between Failures (MTBF) 587,177 hours (calculated using RFD 2000 (UTE C 80-810) Standard)

Regulatory Notices

This equipment carries the RCM label and complies with EMC and radio communications regulations of the Australian Communications and Media Authority (ACMA) governing the Australian and New Zealand (AS/NZS) communities.

Conforms where applicable to European Union (EU) Low Voltage Directive (LVD) 2014/35/EU, Electromagnetic Compatibility (EMC) Directive 2014/30/EU, Radio Equipment Directive (RED)2014/53/EU and RoHS Recast (RoHS2) Directive: 2011/65/EU + Amendment Directive (EU) 2015/863.

This equipment complies with the rules, of the Official Journal of the European Union, for governing the Self Declaration of the CE Marking for the European Union as specified in the above directives.

This equipment carries the UKCA label and complies with all applicable standards.


his is a Class A digital device that meets all requirements of the Canadian Interference-Causing Equipment Regulations.


FCC Rules and Regulations CFR 47, Part 15, Class A.

This equipment complies with the limits for a Class A digital device, pursuant to Part 15 of the FCC rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference; (2) This device must accept any interference received, including interference that may cause undesired operation.