Introduction to the Haydon HAY-PSUEN54-2AL and its key features
Haydon HAY-PSUEN54-2AL — EN54-4 24V 2A Boxed PSUis a purpose-built uninterruptible power supply designed specifically for fire detection and alarm systems. As an EN54-4 certified unit, it combines a regulated 27.6 V DC output with an integrated charger, battery-backup capability and tamper-protected steel enclosure. The unit is rated for 2 A continuous output (model 2AL) and supports 2 × 7 Ah sealed lead-acid batteries in its large-box variant. For installers and system designers working on life-safety projects, the HAY-PSUEN54-2AL delivers the essential mix of compliance, monitoring and robust protection features that fire systems require.
- EN54-4 certified for 24 V fire detection power supply applications.
- Regulated 27.6 V DC nominal output, rated 2 A continuous.
- Integrated automatic charger and mains-to-battery switchover.
- Comprehensive battery protection (deep-discharge disconnect, reverse-connection detection, temperature monitoring).
- Output protections including overload and short-circuit protection and output/battery fusing (F2A).
- Tamper-protected steel enclosure with LED status indicators for mains, battery and fault.
Detailed specifications and benefits
The HAY-PSUEN54-2AL is engineered to meet the demanding requirements of fire detection systems. Below is an organised breakdown of its key technical specifications and the practical benefits each provides.
- Input voltage: 110–240 V AC, 47–63 Hz — supports common mains supplies and simplifies installation across different regions.
- Input current: Listed typical ~0.5 A — helps estimate mains draw for site power planning.
- Nominal output: 27.6 V DC (intended for 24 V fire systems) — a regulated output ensures consistent performance of detectors, control panels and notification devices.
- Rated output current: 2 A continuous — suitable for many small-to-medium fire alarm installations where a primary supply plus standby is required.
- No-charge max output: ≈2.8 A (distributor table) — headroom for short-duration higher loads during charge or transient events.
- Output ripple: <100 mV — low ripple reduces electrical noise that could otherwise interfere with sensitive detection electronics.
- Minimum load: 0.1 A — ensures stable regulation and correct charger operation across load conditions.
- Output/battery fuse: F2A — fused protection improves safety and simplifies fault isolation.
- Protection: Overload, short-circuit, deep-discharge disconnect, reverse-polarity detection and temperature monitoring — these protections protect both the PSU and connected batteries, improving overall system reliability and reducing maintenance risk.
- Recommended batteries: 2 × 7 Ah sealed lead-acid (large-box) — capacity sized to provide required standby durations under typical loads.
- Integrated charger: Automatic charging with monitoring — keeps batteries ready for mains failures without manual intervention.
- Battery monitoring: Low-voltage detect, incorrect connection, short-circuit and temperature monitoring — early fault detection reduces the chance of a failed battery when a fire event occurs.
- Enclosure: Tamper-protected steel box (large) — secures batteries and electronics against tampering and environmental damage.
- Dimensions: Approx. 420 × 400 × 80 mm (large-box variant) — compact enough for cupboards and equipment racks while still accommodating batteries.
- Compliance: EN54-4 (fire detection power supply) — ensures the unit meets European life-safety performance criteria. Confirm CE/UKCA marking on the supplied datasheet during installation.
Use cases and scenarios where the HAY-PSUEN54-2AL excels
The HAY-PSUEN54-2AL is designed primarily for life-safety environments. Typical use cases include:
- Primary and standby power for fire alarm control panels in small-to-medium commercial buildings, schools, offices and retail premises.
- Supplying and backing up detection loops, conventional detectors and sounders/notification devices where EN54-4 compliance is mandated by local regulations or project specification.
- Replacement or upgrade projects where a regulated 27.6 V supply and reliable battery charging are required without redesigning enclosure layouts — the large boxed variant fits into typical service cupboards or distribution boards.
- Installations demanding tamper protection and visible status indication — LED indicators provide clear on-site diagnostics for mains, battery and fault conditions.
Because it includes battery protection and temperature monitoring, the HAY-PSUEN54-2AL is particularly well suited to installations in variable temperature environments or where batteries may be subject to aging and require proactive management.
Comparisons with similar products on the market
When assessing a power supply for a fire system, installers commonly compare EN54-4 boxed PSUs on parameters such as regulatory compliance, output stability, battery support, enclosure form-factor and protective features.
Compared to generic non-EN54 PSUs, the HAY-PSUEN54-2AL has the clear advantage of EN54-4 certification — a critical requirement in many European and UK projects. Against other EN54-4 boxed PSUs of similar rating (24 V, 2 A), notable strengths of the Haydon unit include:
- Regulated 27.6 V output specifically aligned to 24 V fire systems for consistent device performance.
- Comprehensive battery protection (deep-discharge, reverse-connect, temperature) which may be more fully featured than some low-cost EN54 units.
- Tamper-protected steel enclosure with clear LED status indicators — useful for both security and on-site troubleshooting.
Some competing products may offer additional features such as larger battery capacity options, integrated battery cabinets, or additional communication/monitoring interfaces. Selection should therefore be guided by project needs: the HAY-PSUEN54-2AL is a strong choice where a straightforward, standards-compliant boxed PSU with clear protections and compact footprint is required.
Customer feedback and reviews
At the time of writing specific verified customer testimonials for the HAY-PSUEN54-2AL were not provided with the product brief. Typical feedback for EN54-4 boxed PSUs of this class (from installers and system integrators) tends to highlight the following points when the product meets expectations:
- Reliability and long-term stability of the regulated output, leading to fewer nuisance faults on detectors and panels.
- Ease of installation and clear wiring diagrams — reducing commissioning time.
- Meaningful front-panel status indicators that simplify routine site checks.
- Robust battery protection that prevents premature battery failure and reduces callouts.
If you are considering this model for a project, ask your supplier for any available case studies or customer references. For installation, always follow the manufacturer manual and have commissioning performed by qualified personnel.
Conclusion: Why the HAY-PSUEN54-2AL is a great choice
The Haydon HAY-PSUEN54-2AL is a focused, standards-compliant boxed power supply that meets the essential needs of small-to-medium fire detection and alarm installations. Its EN54-4 certification, regulated 27.6 V output, integrated charger and battery monitoring form a balanced offering for life-safety systems where regulatory compliance and reliable standby power are non-negotiable.
Key reasons to specify the HAY-PSUEN54-2AL include: its compliance with EN54-4, practical 2 A continuous output rating, strong battery protection features and tamper-protected enclosure with visible status indicators. These characteristics help reduce operational risk, simplify servicing and support long-term dependability.
For procurement, note the supplied pricing guidance: cost price 148.98 and suggested price 177.36 (values as provided). Always confirm the final price, lead times and confirm CE/UKCA markings and documentation with the supplier or official datasheet prior to purchase and installation.
Finally, remember that safety-critical electrical work must be carried out by qualified installers. Consult the official Haydon datasheet and product manual for detailed wiring diagrams, charging curves and commissioning guidance to ensure the unit performs as intended within your fire detection system.
