Access control Tri-relay module

  • Extend fire & access control loops
  • Easy installation
  • Mount in existing enclosures
  • Compatible with DA301 High-security junction box

DA254: Access control Tri-relay module

Designed for extending critical control circuit loops for access control and fire systems, the Tri-relay unit is ideal for when installing new equipment or extending systems.

In the event of a loss of power within a circuit connected to Coil terminals, such as the triggering of an alarm or fire system, the three control relays will change-over.

The DA254 is available as a 12V DC or 24V DC device, with three SPCO relays with N/O and N/C contacts rated to 24V 5A DC, please refer to ordering information for available models.

Technical information

Download Data sheet

Switching contacts

Relay channelsThree
Contact configurationSingle pole change-over (per channel)
VoltageMaximum 24V
CurrentMaximum 5A DC resistive load
Connection typePCB terminal block (2mm²)


DA254-12V DA254-24V
Voltage 12V DC 24V DC
Power consumption < 80mA < 80mA
Connection type PCB terminal block (2.5mm²) PCB terminal block (2.5mm²)


Operating temperature -10°C to +40°C
Storage temperature -20°C to +50°C
Operating relative humidityMaximum 95% non-condensing



Width 100mm
Height 50mm
Depth 20mm
Weight < 0.1Kg
Enclosure material N/a
Finish PCB Only

Ordering information

GTINPart codeDescription
DA254-12V12VDC Access control Tri-relay module
DA254-24V24VDC Access control Tri-relay module

Available from all good distributors.

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DA301: High-security junction box

  • Tamper-switched
  • Contact rating 30V DC 1A

Fully seam-welded, this small metal junction box with both front and rear lid tamper switches is provided with optional tamper-proof screws to facilitate installation to EN50131.

Mains power failure detector

  • Mains present indication
  • Fault indication (follows relay)
  • Alarm relay, SPST 30V DC 1A
  • Tamper switch
  • Supply voltage 12V DC

Pre-wired resistor packs

  • Pack of 8 pre-wired EOL resistors
  • Wires 100mm
  • Made in Britain with 5 year warranty

This range of resistor packs are designed to significantly reduce installation time on-site for electrical engineers.

Weather-resistant  SecurePoE

  • IP66 Rated power injectors
  • Optional UPS 1.2Ah, 7Ah & 10Ah VRLA Battery back-up
  • Optional 5-Port network switch
  • Tamper-switched secure ABS housing
  • 30W of load power per port, to IEEE 802.3:2012
  • 90-270V AC, 47-63Hz universal mains-input
  • Power status LEDs & monitoring contacts

Rated to IP66 these power supplies are ideal for outdoor harsh weather and industrial environmental conditions.