Introduction to the Haydon HAY-DC24V2ABBLPSU and its key features
The Haydon HAY-DC24V2ABBLPSU is a boxed 24 V DC power supply designed specifically for security and access control installations. Combining a compact metal enclosure with an integrated battery charger and tamper/mains-fail signalling, this unit offers installer-grade features for intruder alarm panels, access control systems and other low-voltage security devices. Rated to deliver up to 2.0 A (48 W) and able to accept universal mains input (90–264 VAC), the Haydon boxed PSU is a practical solution where reliable mains-to-DC conversion, local battery backup and enclosure security are required.
Key features at a glance:
- Nominal output 24–27.6 V DC at up to 2.0 A
- Integrated charger supporting 2 × 12 V 7 Ah lead-acid batteries (charge current ≈0.5 A)
- Universal mains input 90–264 VAC, 50–60 Hz
- Volt-free tamper contacts (lid & rear) and mains-fail relay for panel signalling
- LED status indicators for mains, battery and fault conditions
- Electronic overload/short-circuit protection and load fusing
- Sturdy metal enclosure (W360 × H330 × D90 mm) sized to fit two 12 V 7 Ah batteries
Detailed specifications and benefits
The HAY-DC24V2ABBLPSU accepts a wide mains voltage range of 90–264 VAC at 50–60 Hz, making it suitable for installations in different regions without the need for voltage-specific variants. When mains is present the unit provides a nominal 27.6 V DC output (for charging and to maintain battery float), and when delivering power under normal load the nominal output is 24 V DC. The maximum continuous load is 2.0 A, giving a total power capacity of around 48 W — ample for small-to-medium alarm panels, maglock drivers, keypads and ancillary sensors.
Protection features include electronic overload/short-circuit shutdown on the mains-supplied output and dedicated fusing on the load output. The result is safer operation in environments where wiring faults or device failures might otherwise damage equipment or trip whole-site power.
One of the principal benefits of a boxed PSU like the Haydon is the capacity for local battery backup. The HAY-DC24V2ABBLPSU houses two 12 V, 7 Ah sealed lead-acid batteries and provides a built-in charger with an approximate maximum charge current of 0.5 A. This charging rate is suitable for maintaining standby batteries in alarm installations without excessive charge current that could reduce battery life.
With batteries fitted, the unit will automatically supply the load during mains failure, while the mains-fail relay provides a volt-free contact to notify the control panel or monitoring equipment. This combination of battery support and signalling is essential for security systems that require uninterrupted power and remote reporting of loss-of-mains events.
LED indicators report mains presence (green), battery status (orange for charging, green for charged, red for discharging) and fault conditions (red). These visual cues speed up commissioning and routine maintenance. Volt-free tamper contacts protect the enclosure lid and rear mounting, and the configurable mains-fail relay can be set for normally open or normally closed operation to match panel requirements.
Terminals are provided for B+ / B− battery connections, V+ / V− load output, and the COM / N.O. / N.C. mains-fail contacts, making wiring straightforward for experienced installers. The metal enclosure is sized to accept two 12 V 7 Ah batteries while still providing secure cable entry and mounting points.
The robust metal box measures W360 × H330 × D90 mm, offering a compact footprint while leaving space for battery bays. Operating temperature range is −10 °C to +40 °C with storage rated up to −20 °C to +60 °C and relative humidity tolerance up to 95% non-condensing. These environmental limits make the unit suitable for plant rooms, equipment cupboards and other protected indoor locations commonly used for security system power supplies.
Use cases and scenarios where the Haydon PSU excels
The HAY-DC24V2ABBLPSU is well-suited to a number of real-world applications where reliable 24 V DC power and local backup are required:
- Intruder alarm panels in small commercial premises: delivers stable supply to the panel and peripherals while providing a monitored battery backup and tamper detection for the enclosure.
- Access control systems: powers controllers, readers and door hardware, and keeps systems online during short mains outages so that doors remain operable or fail to a safe state as configured.
- Remote CCTV accessory power: supports small camera power supplies and peripheral devices where local battery hold-up reduces false alarms or loss of recording during brief outages.
- Service closets and plant rooms: compact boxed form and clear LED status simplify maintenance in multi-system environments.
- New builds and retrofits: universal mains input and configurable signalling make the unit a convenient choice for installers standardising across jobs.
Because the unit is installer-grade and requires compliance with wiring regulations, it is best suited to professional installation or competent DIY electricians comfortable with low-voltage and battery precautions.
Comparisons with similar products on the market
When comparing the Haydon HAY-DC24V2ABBLPSU with other boxed 24 V PSUs, several differentiators emerge:
- Battery capacity and charger rate: the Haydon supports two 12 V 7 Ah batteries with a modest charge current (≈0.5 A). Some competing units offer higher charge currents for faster recharge but at the cost of increased battery stress and heat. For many alarm and access control installations the Haydon's balance of charging and battery capacity is desirable.
- Load current: at 2.0 A the Haydon targets small-to-medium systems. Larger sites with heavy lock loads or many peripherals may choose 5 A or higher boxed supplies, but those are bulkier and more expensive. The Haydon fills a sweet spot for smaller commercial and larger domestic installations.
- Signalling and tamper: the inclusion of volt-free tamper contacts and a configurable mains-fail relay is on par with typical security-focused PSUs. Some budget power supplies lack tamper contacts or have fixed relay states, reducing flexibility when integrating with alarm panels.
- Build and footprint: the metal enclosure and battery bays for two 7 Ah cells are typical for the class. Higher-end models may include larger enclosures, additional monitoring outputs, or shrouded battery terminals; lower-end models sometimes omit clear LED status or protective shutdown features.
Overall, the Haydon unit competes well on price-to-features for installers needing a reliable, compact PSU with battery backup and signalling — especially where space and cost constraints make larger units impractical.
Customer testimonials and typical installer feedback
While individual customer reviews for a specific SKU may vary by supplier, common themes from installers and system integrators when discussing this type of boxed PSU include:
- "Reliable performance during mains fail" — installers appreciate clear LED status and the mains-fail relay for integration with panel reporting.
- "Good fit for small-to-medium systems" — the 2 A rating and two 7 Ah battery bays are often described as the right compromise between run-time and size for retail, small office and multi-door access control installations.
- "Easy to wire and maintain" — standardised terminal labelling and straightforward fusing make routine servicing and commissioning quicker.
If considering purchase, ask suppliers about local CE/UKCA marking and any extended warranty options; this model is typically sold as an installer product and individual reseller warranties may vary.
Conclusion: why choose the Haydon HAY-DC24V2ABBLPSU
The Haydon HAY-DC24V2ABBLPSU is a practical, installer-focused boxed power supply that combines reliable 24 V DC output with integrated battery backup, tamper contacts and a mains-fail relay. Its universal mains input, clear LED indicators and protective features make it suitable for a wide range of security and access control applications where uninterrupted power and signalling matter. For small-to-medium systems that do not require high current capacity, this unit offers a balanced mix of safety, functionality and compact design.
At a suggested price of 64.99 (pricing varies by supplier), the HAY-DC24V2ABBLPSU represents a cost-effective option for professional installers and competent DIYers who need a boxed PSU with local standby capability. Always ensure installation follows local wiring regulations, confirm compliance markings with your supplier, and select appropriate batteries from reputable manufacturers to maximise safety and service life.
Stock note:2 units available (as provided). For most small commercial and residential security installations the Haydon boxed PSU is a dependable choice that keeps systems powered, monitored and protected.
