Key Features

  • 27.6V dc output
  • EN54 certified
  • Cost-effective switch mode technology
  • Energy efficient
  • LED indication


The Elmdene STX range of switch mode power supplies are designed for EN 54 compliant fire systems and are certified to EN 54-4:1997, A1:2002 and A2:2006.

Elmdene STX power supply units are available in 1A and 2A versions with a range of enclosures to give the installer a choice of standby battery backup options with support for two 12V 1.2Ah batteries and two 12V 17Ah batteries.

These cost-effective fire alarm system power supply units provide a full rated current at 27.6V dc with additional current for battery charging. STX power supplies also support intelligent battery charging and monitoring using Elmdene’s EcoCharge technology and independent volt-free outputs to report mains failure and battery faults, charger faults or loss of output reports. These units also feature battery deep discharge protection in the event of a prolonged mains failure.

LED indicators provide quick diagnosis of the power supply showing the mains status, output fault, battery fault and charger fault indications.

Additional Features

  • Intelligent battery charging and monitoring
  • Deep Discharge Protection
  • Remote fault signalling
  • Full rated current to load plus additional current for battery charging
  • Mains transient protection


The STX PSUs are fully approved by UL for safe use and installation in any European Union country and bears the CE mark to show that it complies with all the applicable Directives including the CPR, EMC and the Low Voltage Directive (LVD).

  • EN54-4:1997+A1:2002+A2:2006
    Fire detection and fire alarm systems – Power supply equipment.

Tech Specs

Mains Input93 to 264Vac
Maximum CurrentSTX2401-C: 1A
STX2402-C: 2A
STX2402-E 2A
Battery CapacitySTX2401-C: 2 x 12V 7Ah
STX2402-C: 2 x 12V 7Ah
STX2402-E: 2 x 12V 17Ah
Operating Temperature-10°C to 40°C at 95% RH
Dimensions (W x H x D)C Models: 275mm x 330mm x 80mm
E Models: 420mm x 400mm x 80mm



Power Supply, 1A, 24Vdc, 110-240Vac, 7AH Max

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