Introduction to the Haydon EN54-4 27.6V DC 2A Fire Alarm Power Supply
The Haydon HAY-PSUEN54-2A (marketed as the Haydon 27.6V EN54-4 PSU 2A) is a compact, standards-compliant uninterruptible power supply (UPS) designed specifically for fire detection and alarm systems. Built to the EN54-4 standard, this unit delivers a regulated 27.6 V DC output at a rated continuous current of 2 A and includes an integrated battery charger, internal battery compartment for standby cells, fault signalling, and a lockable tamper-protected steel enclosure. Its combination of compliance, essential safety features, and straightforward installation makes it a strong choice for contractors, system integrators and building managers seeking a reliable power source for small to medium fire alarm installations.
Key features at a glance
- EN54-4 compliant— meets the European standard for fire alarm power supplies.
- 27.6 V DC, 2 A output— continuous uninterruptible power for detectors, callpoints and sounders.
- Integrated battery support— supports typical internal batteries (2 × 7 Ah SLA) with charger and deep-discharge protection.
- Wide mains input range— accepts approx. 110–240 VAC, 47–63 Hz for flexible installation.
- Fault and monitoring— mains/battery/fault LEDs plus a volt-free mains-fail relay for remote signalling.
- Secure enclosure— lockable, tamper-detecting steel enclosure with hinged lid.
Detailed specifications and benefits
The HAY-PSUEN54-2A packs a focused set of electrical and mechanical features tailored to fire alarm systems. Understanding these specifications helps explain the practical benefits you get on-site.
- Output voltage:27.6 V DC — a common nominal voltage for conventional fire system peripherals, ensuring compatibility with many detectors, sounders and control modules.
- Rated output current:2 A continuous — ideal for small-to-medium systems or as localised power for a zone of devices.
- Mains input:approx. 110–240 VAC, 47–63 Hz — wide input range simplifies procurement and supports installations across different regions and wiring supplies.
- Battery charger:Typical charger current ≈0.5 A — sized to maintain standby SLAs while managing charge cycles to extend battery life.
- Output ripple:<100 mV (typical) — low ripple helps prevent nuisance activations and maintains stable operation of sensitive electronics.
- Fusing:Output and battery fuses fitted — ensure correct protection and isolate faults quickly (refer to datasheet for exact ratings).
- Supported battery:Typical internal fitment of 2 × 7 Ah sealed lead–acid (SLA) batteries — provides required standby autonomy for many applications.
- Protection features:deep-discharge cut-off, low-voltage & short-circuit detection, and temperature monitoring — all contribute to battery longevity and system safety.
- Internal compartment:batteries housed inside a lockable steel enclosure for security and neat installation.
- Fault relay:volt-free mains-fail / fault relay output for remote monitoring and integration with building management or alarm panels.
- LED indicators:dedicated mains, battery and fault LEDs provide clear local status at a glance.
- Tamper detection:lid-open tamper switch and lockable hinged steel enclosure to deter unauthorised access and protect against tampering.
- Physical:compact enclosure (typical dimensions approx. 275 × 330 × 80 mm) suitable for wall mounting in service cupboards, plant rooms or distribution areas.
Use cases and scenarios where the product excels
The Haydon 27.6V EN54-4 2A PSU is designed for practical real-world deployments. Typical applications include:
For retail outlets, small offices, restaurants and similar premises, the 2 A output is often sufficient to power a single fire alarm panel plus connected sounders and detectors across one or more zones. The compact, lockable enclosure allows tidy wall mount installations in riser cupboards or plant rooms.
Shared-residence buildings, student accommodation and small apartment blocks can use this unit to provide EN54-4 compliant backed power for communal detection zones or localised sub-systems where larger central PSUs are unnecessary.
When upgrading older systems to achieve compliance with EN54-4 or when adding battery-backed power in retrofit scenarios, this PSU provides a straightforward replacement or addition. The wide mains input and compact footprint make it simple to swap into existing installations.
The volt-free fault relay and clear LED indicators make this PSU suitable where remote fault reporting to a fire panel or building management system is required. Tamper detection also supports enhanced site security and compliance with audit/regulatory checks.
Comparisons with similar products on the market
When selecting a power supply for a fire alarm system, installers typically weigh capacity, compliance, form factor and monitoring features. Here is how the Haydon HAY-PSUEN54-2A compares against common alternatives:
- Higher-capacity EN54-4 PSUs (3A, 5A and above):Larger units deliver greater continuous current for bigger panels and more devices. If your system needs sustained high-current operation or supports many sounders/detectors, choose a higher-rated PSU. The Haydon 2A unit, however, fits smaller installations where excess capacity would be wasted.
- PSUs with remote telemetry or supervised outputs:Some competitors offer integrated remote monitoring via serial, network or supervised signalling channels. If centralised cloud or network-based fault reporting is a priority, consider units with expanded telemetry. The HAY-PSUEN54-2A focuses on essential volt-free relay signalling and local status LEDs — the simpler approach preferred by many installers for reliability and cost.
- Modular or redundant power systems:For mission-critical sites (data centres, hospitals), modular redundant power designs give failover beyond single-battery protection. The Haydon 2A PSU is aimed at conventional fire detection systems rather than fully redundant power architectures.
- Value and compliance:Against comparable 2 A EN54-4 PSUs, Haydon’s unit competes strongly on price-to-feature balance: it combines required EN54-4 compliance, a tamper-proof enclosure and battery management in a compact package that is often more cost-effective than heavily featured models.
Customer feedback and installer impressions
Public, attributable customer testimonials were not provided with the product brief. Typical, anonymised feedback from installation professionals and system integrators who use EN54-4 2 A PSUs highlights the following common points:
- Reliability: Installers report that straightforward EN54-4 units with clear status indicators reduce call-backs and simplify maintenance visits.
- Ease of installation: Compact size and familiar battery layout make field wiring and battery replacement quicker than larger or more complex units.
- Value: For projects with modest power needs, contractors appreciate an affordable but compliant PSU that avoids over-specifying equipment.
If you require verified customer reviews for procurement, consult distributor product pages or datasheets where user feedback or case study summaries may be published.
Conclusion: Why the Haydon HAY-PSUEN54-2A is a solid choice
The Haydon EN54-4 27.6 V DC 2 A power supply offers a balanced mix of compliance, core safety features and practical installation benefits. It suits many small-to-medium fire alarm applications where EN54-4 certification is required and where a compact, tamper-protected enclosure is beneficial. Key advantages include EN54-4 compliance, internal battery support with protection features, a wide mains input range for flexible deployment, and fault signalling for integration with broader building systems.
While larger or more feature-rich PSUs may be necessary for bigger or mission-critical sites, the HAY-PSUEN54-2A provides a dependable, cost-effective option for contractors and facilities managers who need an industry-standard, uncomplicated solution. For full installation guidance, electrical tables, fuse ratings and wiring diagrams, always consult the manufacturer's datasheet and ensure installation is performed by a competent person in accordance with local regulations such as BS 5839.
With its clear focus on regulatory compliance and practical site needs, the Haydon 27.6V EN54-4 2A PSU is a sensible choice where dependable, battery-backed fire alarm power is required.
