Introduction: Reliable 24V Power with Built‑in Battery Backup
The Haydon HAY-DC24V5ABBLPSU is a boxed AC→DC power supply designed for installations that require continuous 24 V power with intelligent battery standby. Targeted at security, access control and small CCTV systems, this unit combines a regulated 27.6 V nominal output (for 24 V battery systems) capable of delivering up to 5 A, with an integrated charger for two 12 V lead‑acid batteries. Housed in a robust metal enclosure sized to accept two 7 Ah batteries, the HAY-DC24V5ABBLPSU adds monitored tamper contacts, a mains‑fail volt‑free relay and local LED indicators to simplify installation and diagnostics.
- 27.6 V nominal output (24 V battery system) up to 5 A (120 W)
- Integrated charger for 2 × 12 V lead‑acid batteries (recommended 2 × 7 Ah)
- Mains‑fail volt‑free relay plus lid and rear tamper contacts
- Local LEDs for mains, fault and battery status
- Large clam‑lid metal enclosure sized W360 × H330 × D90 mm
- Universal mains input: 90–264 VAC, 50–60 Hz
Detailed Specifications and Benefits
Understanding the technical specifications helps clarify why this unit is well suited to security and small industrial applications. The HAY-DC24V5ABBLPSU combines stable DC output characteristics and essential monitoring features that installers expect.
- Mains Voltage:90–264 VAC — suitable for international supply ranges and tolerant of wide line variations.
- Frequency:50–60 Hz — compatible with common power systems.
- Mains Fuse:3.0 A, 250 V — accessible protection on the AC side.
- Nominal Output:27.6 V DC for a 24 V battery system — allows correct float charging and device compatibility.
- Max Current:5.0 A (120 W) — suitable for small alarm panels, several access readers or modest CCTV setups.
- Ripple:≤150 mV p‑p — low enough for sensitive electronics commonly used in security systems.
- Protection:Output fuse (5 A model specific) and electronic overload shutdown when mains present, helping to protect connected loads and the supply itself.
- Battery Type:Supports 2 × 12 V lead‑acid in series to provide 24 V standby.
- Recommended Capacity:2 × 7 Ah — common, compact batteries that fit the supplied enclosure dimensions.
- Charge Current:Up to 0.5 A — an appropriate float/standby charge for maintaining SLA batteries without overcharging.
- LEDs:Mains (green), Fault (red), Battery (orange/green/red) — quick visual health checks for installers and maintenance staff.
- Mains‑Fail Relay:Volt‑free COM/N.C./N.O. contacts — enables external alarm panels or building management systems to detect mains loss.
- Tamper Contacts:Lid and rear volt‑free contacts that are closed when mounted and the lid is shut — provides a tamper loop for security systems.
- Terminals:B+, B-, V+, V-, COM, N.O., N.C., Tamper — clearly segregated connections for batteries, loads and monitoring circuits.
- Enclosure:Clam‑lid metal box designed to house two 7 Ah batteries — robust and suitable for secure mounting.
- Dimensions:W360 × H330 × D90 mm — compact enough for equipment cabinets, cupboards or dedicated power boxes.
- Operating Temp:−10 °C to +40 °C; Storage: −20 °C to +60 °C; Humidity: 95% RH non‑condensing — typical environmental tolerances for indoor installations.
Use Cases and Scenarios Where the Unit Excels
The Haydon unit is tailored for environments where monitored standby power and tamper detection are important. Here are common scenarios where it is a strong choice:
- Provides regulated 24 V power and an internal battery charger so alarm panels continue running during mains outages. The mains‑fail relay allows the alarm system to log or report mains loss as an event.
- Access controllers and electric locks often require stable 24 V. The tamper contacts help secure the power enclosure, preventing covert disconnection of critical power.
- For a small cluster of analogue cameras or network devices, the 5 A output can keep devices powered and batteries maintained for short mains interruptions or controlled shutdowns.
- Where a compact, boxed solution is preferred to an open‑frame supply, this product offers tidy installation, security features and monitored status for building management or security teams.
Comparisons with Similar Products
When choosing a power solution for security and access control, buyers typically consider four broad types: boxed supplies with battery backup (like the Haydon), open‑frame industrial power supplies, DIN‑rail power supplies with external battery modules, and full UPS systems.
Open‑frame units are compact and inexpensive but require a separate battery enclosure and lack integrated tamper monitoring. The Haydon boxed approach simplifies wiring, provides built‑in tamper contacts and leaves a neat install footprint — important for security installations where enclosure security and monitored status matter.
DIN‑rail systems with separate chargers can be modular but may need additional cabinet space and wiring. The Haydon unit reduces system complexity by bundling the charger, relay and monitoring inside a single metal box sized for two SLA batteries.
UPS units provide broader surge protection, longer runtime options and graceful shutdown capabilities for sensitive electronics. However, for many alarm and access control applications where runtime needs are modest and cost is a factor, a dedicated 24 V battery‑backed PSU like the HAY-DC24V5ABBLPSU is more cost‑effective and purpose designed.
Customer Feedback and Installer Observations
While we don’t have specific named testimonials in this listing, general feedback from installers and system integrators for boxed power supplies with integrated backup tends to highlight a few consistent points:
- Ease of installation: Having the charger, tamper loops and mains‑fail relay present in one enclosure reduces installation time and wiring errors.
- Reliability: Units with clear LED diagnostic indicators make site commissioning and maintenance quicker, helping teams identify battery or mains issues at a glance.
- Space and fit: Installers appreciate a box sized to accept standard 7 Ah batteries without additional mounting work.
Typical comments from professionals often praise the combination of monitored outputs and tamper protection, especially in retrofit projects where replacing a standalone supply and adding alarm‑grade monitoring would otherwise add time and cost.
Safety, Compliance and Practical Considerations
Installation should be performed by a qualified electrician or competent installer. Refer to the manufacturer datasheet for correct wiring, battery selection and any applicable CE/UKCA marking or local regulations. The HAY-DC24V5ABBLPSU includes fusing and electronic overload protection, but correct cable sizing, battery venting (where applicable) and secure mounting remain the responsibility of the installer.
Price and Value
With a suggested price of 99.99 (cost price 82.31), the unit sits in a segment aimed at installers seeking a balance of capability and cost. Compared with buying a separate power supply, charger and enclosure, the integrated approach typically reduces total installed cost and labour.
Conclusion: Why Choose the HAY-DC24V5ABBLPSU?
The Haydon HAY-DC24V5ABBLPSU is a pragmatic, purpose‑built solution for small to medium security and access control installations. It combines a reliable 27.6 V nominal output capable of delivering 5 A with an integrated charger for two 12 V batteries, plus essential monitoring features such as a mains‑fail relay and tamper contacts. For installers who value tidy installs, monitored standby power and straightforward diagnostics, this boxed power supply offers a cost‑effective and compact option. Always ensure proper installation by a qualified person and follow the datasheet for battery selection and wiring best practice.
