Haydon HAY-PSUEN54-2AL — EN54-4 boxed uninterruptible power supply (24 V)

The HAY-PSUEN54-2AL is an EN54-4 compliant, tamper‑protected boxed power supply and battery charger for fire detection and alarm systems. It provides a regulated 27.6 V DC output with integrated battery charging and automatic switchover to battery on mains failure, plus battery monitoring and protection functions.

• EN54-4 certified for life-safety fire alarm installations — designed for 24 V fire systems.
• Regulated 27.6 V DC nominal output, rated 2 A continuous output (model 2AL).
• Integrated charger and battery-backup with automatic mains-to-battery switchover.
• Battery protection: deep-discharge disconnect, reverse-connection detection, short-circuit and temperature monitoring.
• Output protection: overload/short-circuit protection and output/battery fusing (F2A listed).
• Tamper-protected steel enclosure (large-box variant) with LED status indicators for mains, battery and fault.

Typical applications: Primary power and standby for fire detection and alarm control panels, detectors and notification devices where EN54-4 compliance is required.

Safety & compliance: Fit and commission only by a qualified installer. Isolate mains and follow manufacturer wiring diagrams during installation. Confirm local approvals and markings (EN54-4 listed; check CE/UKCA status on supplied datasheet). Batteries are hazardous goods — use recommended sealed lead‑acid batteries and follow battery handling guidance.

For full wiring diagrams, charging curves, installation instructions and detailed performance data, consult the official Haydon datasheet and product manual supplied with the unit.