Overview: The HAY-PSUEN54-5AL is an EN54-4 compliant 27.6 V DC uninterruptible power supply for fire detection and alarm systems. It provides a continuous mains-fed output with automatic switchover to battery backup, integrated charger and battery protection. Supplied in a tamper-protected metal enclosure with front-panel LEDs and volt-free fault relay for remote monitoring.

• Key features:
  • EN54-4 certified for fire alarm power supply use.
  • 27.6 V DC nominal uninterruptible output for fire systems.
  • 5 A usable output (model variant “5A / 5AL”).
  • Integrated battery charger with deep-discharge protection and continuous battery monitoring.
  • Front-panel LEDs (mains, battery, fault) and volt-free fault relay for remote signalling.
  • Tamper-protected metal enclosure; available in standard and large enclosure variants.
• Use cases: Designed for use in commercial and residential fire detection and alarm installations where EN54-4 compliance and reliable battery-backed 24 V supply are required. Suitable for system installers and contractors requiring a boxed, monitored PSU solution.
• Safety & compliance: EN54-4 certified — consult the official datasheet for full EN54 compliance details, wiring diagrams, battery charging curve, relay ratings and any CE/UKCA marking details. Installation should be carried out by a competent electrician in accordance with local regulations and the device datasheet.
• Notes: Battery capacity and enclosure size vary by SKU (standard vs large box). Confirm the exact enclosure/battery variant on the order/packing list before installation.