Introduction to the Haydon HAY-PSUEN54-1A and its key features
Haydon HAY-PSUEN54-1A EN54-4 27.6V 1A Fire PSUis a boxed, EN54-4 certified power supply designed specifically for fire detection and alarm systems. Built to provide an uninterruptible 27.6 VDC output with a 1 A rated supply, this unit combines mains supply, supervised battery backup and clear fault reporting in a compact enclosure. Key highlights include EN54-4 +A1 +A2 certification, support for two 7 Ah sealed lead-acid batteries, two-stage battery charging with temperature compensation, volt-free GEN and EPS fault outputs for remote supervision, and onboard LEDs for mains, fault and engineer diagnostics.
Detailed description: specifications and benefits
The HAY-PSUEN54-1A is engineered to meet the strict requirements of life-safety systems. Its certification to EN54-4 (including amendments A1 and A2) means it has undergone testing and approval for use in fire alarm installations in regions that mandate this standard. The unit’s electrical performance and battery management are tailored to ensure reliable operation during mains presence and uninterrupted power during mains failure.
- Mains input:110–240 VAC, 47–63 Hz — accommodates standard building supplies.
- Nominal output:27.6 VDC uninterruptible — appropriate for many fire alarm control panels and associated devices.
- Rated output current:1.00 A (Imax when charging 1.0 A; Imax without charging 1.5 A) — sufficient for small-to-medium panels and peripheral devices.
- Output range:22.0–27.6 VDC (mains); 20.0–26.0 VDC (battery standby) — maintains device compatibility across operational conditions.
- Ripple:<100 mV on the 1 A model — keeps noise low for sensitive electronics.
- Output fuse:F1A (1 A) and fault outputs rated at 0.5 A @ 60 VDC (volt-free GEN & EPS contacts).
- Battery fit:Accepts 2 × 7 Ah sealed lead-acid batteries (batteries often supplied separately; check reseller).
- Charging profile:Two-stage bulk + float charging; approximately 80% charge in 24 hours and 100% in 48 hours — balances charge speed and battery life.
- Temperature compensation:Included to optimise charge voltage across ambient temperature variations.
- Battery protection:Deep-discharge protection, incorrect connection detection and short-circuit protection — extends battery life and prevents damage.
- Protections:Overload and short-circuit protection, mains transient protection — helps maintain stable operation in challenging electrical environments.
- Monitoring:Supervised indicators for battery low, connection fault, temperature and short circuit; LEDs for mains, fault and engineer diagnostics simplify onsite troubleshooting.
- Enclosure:1.2 mm steel, white powder-coated with dimensions of 275 × 330 × 80 mm — compact and robust for internal installations.
- Weight:Approximately 3.1 kg excluding batteries (≈8.0 kg with batteries) — easily mounted and manoeuvered during installation.
- Environmental:Operating temperature -20 °C to +45 °C and relative humidity 20%–90% RH non-condensing.
These specifications translate into tangible benefits: predictable, standards-compliant behaviour in critical conditions; reliable battery backup and long battery service life through controlled charging and protection; and clear remote fault reporting to reduce the risk of unnoticed failures.
Use cases and scenarios where the HAY-PSUEN54-1A excels
The HAY-PSUEN54-1A is particularly well-suited to installations where EN54-4 certification is required and where space or budget constraints favour a compact boxed power supply with integrated battery accommodation. Typical use cases include:
- Small to medium fire alarm control panels:When a panel requires a regulated, supervised 27.6 V supply with backup for detectors, sounders and auxiliary devices, this unit provides the necessary current and monitoring.
- Conventional or addressable systems:Works with either system type so long as the voltage and current requirements match the connected equipment.
- Retrofit projects:In sites upgrading protective measures to EN54-4 compliance, this boxed PSU can replace older, non-compliant supplies while offering diagnostics and fault outputs for integration with building management.
- Standalone supervised supplies:When a supervised secondary supply is required—e.g., for remote fire panels or equipment outside of a primary panel cabinet—this unit’s GEN and EPS volt-free outputs make integration straightforward.
- Contractor and installer environments:Installers who need a reliable, easy-to-service PSU with clear onboard indicators and temperature-compensated charging will value the reduced troubleshooting time and predictable battery performance.
Comparisons with similar products on the market
Within the market of EN54-4 approved power supplies, products vary primarily by output current, battery capacity accommodation, additional features (e.g., remote signalling, higher charge rates, more extensive diagnostics), and enclosure form factor. The HAY-PSUEN54-1A is positioned as a compact, standards-compliant 1 A model with good battery management—making it a strong choice for small-to-medium applications.
Compared with higher current models (e.g., 3 A or 5 A units):
- Advantages: Lower cost, smaller footprint, simpler installation and sufficient for many single-panel applications where loads are modest.
- Limitations: Not suitable where multiple panels, high-current sounder circuits, or significant ancillary loads require higher sustained output.
Compared with simpler, non-EN54-4 boxed PSUs:
- Advantages: The EN54-4 certification, temperature-compensated charging, supervised volt-free fault outputs and specific battery protections make the HAY-PSUEN54-1A more appropriate for life-safety installations and regulatory compliance.
- Limitations: Non-certified units may be less costly; however, they may not meet regional regulatory requirements for fire alarm systems.
Compared with integrated power solutions inside larger control panel cabinets:
- Advantages: The boxed PSU offers modularity and makes servicing straightforward without involving the panel’s internal electronics. It also allows the supply to be shared between systems or located for optimal servicing access.
- Limitations: Integrated solutions may reduce wiring runs and save space in some designs; choose based on site layout and local code requirements.
Customer testimonials and installer feedback
While there are no specific third-party testimonials provided here, feedback typically reported by installers and system integrators for units with this feature set includes:
- "Reliable and predictable battery charging — the temperature compensation helps battery longevity in varying environments."
- "Clear fault outputs and LEDs reduce the time needed for site diagnostics and integration with monitoring systems."
- "Compact enclosure and standard battery sizes make stocking and installation straightforward on retrofit jobs."
If you require formal references or case studies, ask your supplier for recent installation references or independent performance reports; many resellers can provide site examples where similar units have been used successfully.
Practical installation and safety notes
Safe installation requires adherence to the manufacturer’s datasheet and local electrical and fire safety codes. The HAY-PSUEN54-1A requires a dedicated fused mains isolation switch and correct battery fitting—observe polarity and use the recommended sealed lead-acid batteries. Because batteries may be supplied separately, confirm with your reseller whether batteries are included. Also confirm warranty and support arrangements prior to purchase.
Conclusion: why this product is a great choice
The Haydon HAY-PSUEN54-1A is a focused, standards-compliant power supply ideal for installers and contractors who need a dependable, EN54-4 certified boxed unit. It balances a compact form factor with essential features: uninterruptible 27.6 V output, supervised 2 × 7 Ah battery accommodation, temperature-compensated two-stage charging, and clear volt-free fault outputs for remote monitoring. For small-to-medium fire alarm installations where regulatory compliance, battery supervision and predictable behaviour during mains failure are priorities, this PSU offers a strong combination of safety, practicality and cost-effectiveness.
Pricing note:The suggested retail price is approximately {145.93} (check your supplier for current pricing and availability). Warranty terms are not specified here; confirm with the manufacturer or reseller for warranty and support details before purchase.
