In the world of electronic security and access control, power failures are more than just an inconvenience, they are a direct risk to safety and system integrity. No matter how advanced your access control system is, it is only as reliable as the power supply that operates it. Door controllers, maglocks, readers, and intercoms all rely on stable DC power. If that power drops, even momentarily, access control can fail, leaving buildings exposed.
For almost two decades, the Powerbox PB256 Series has been the trusted choice for installers, integrators, and consultants across New Zealand and Australia. With more than 70,000 units deployed in the field, the PB256 has earned its reputation as the benchmark for reliability in security installations. Other manufacturers have tried to copy it, but none have matched its proven performance and long-term support.
Long-Term Commitment to the Industry
One of the PB256’s strengths is not just its reliability in the field, but Powerbox’s long-term support strategy. We have kept the PB256 in continuous production by:
- Redesigning key components as semiconductors, I/Cs, capacitors, and other parts have reached end-of-life.
- Managing obsolescence to maintain form, fit, and function for backwards compatibility in legacy systems.
- Maintaining a stable price point with only modest gains to reflect changes in cost, ensuring integrators can continue to deploy the PB256 without unexpected budget impact.
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Ensuring continuity of supply so integrators can standardise on the PB256 without concern for discontinuation.
This lifecycle management demonstrates a long-term commitment to the security industry. Customers can specify the PB256 today with confidence that Powerbox will continue to support and evolve the product in line with industry requirements well into the future.
Proven Reliability at Scale
The PB256 is the workhorse of the market. Security integrators know that when a PB256 is specified, they are deploying a DC-UPS that will deliver regulated output, intelligent battery management, and reliable switchover every time.
Reliability in this context means more than just uptime. It also includes:
- Regulated 13.8 Vdc and 27.6 Vdc outputs that remain stable under both mains and battery-backed conditions.
- Built-in battery charge current limiting to extend standby battery life.
- Low voltage disconnect (LVD) to prevent deep discharge and protect batteries from irreversible damage.
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Relay alarm outputs (DC OK, Battery Fault, Battery Low) for proactive fault detection.
Enduring Value in the Field
The PB256’s longevity in the market reflects the balance it strikes between technical performance and practical deployment. Installers continue to specify it because:
- It is familiar and trusted – technicians know how to wire, configure, and maintain it.
- It is serviceable – battery connections, fusing, and alarm integration follow best-practice layouts.
- It is cost-effective over the lifecycle – with fewer site callouts, longer battery life, and proven compliance with New Zealand standards including RCM.
- It has maintained a stable and predictable price point, with only modest gains to reflect changes in cost, protecting integrators and end-users from sudden increases.
Frequently Asked Questions - Powerbox PB256 Series
Q: Why has the PB256 lasted so long in the market?
Because it was designed for the security industry from day one. By focusing on reliability, backwards compatibility, and stable pricing with only modest gains over time, the PB256 has avoided the short product lifecycles common in IT and consumer power products.
Q: Is the PB256 suitable for both 12Vdc and 24Vdc systems?
Yes. The PB256 Series is available in both 13.8Vdc and 27.6Vdc versions, supporting a wide range of access control, locking, and intercom equipment.
Q: How does Powerbox handle component obsolescence?
Our engineering team re-designs around end-of-life parts such as semiconductors, I/Cs, and capacitors while maintaining form, fit, and function. This means PB256 units supplied today are fully compatible with installations from years ago.
Q: What if I need more advanced diagnostics?
For higher-dependency sites such as data centres or government facilities, Powerbox offers the PB356 and PB358 with enhanced alarms, battery testing, and remote monitoring. For most access control systems, the PB256 remains the ideal balance of function, cost, and proven performance.
Q: Can the PB256 be utilised for applications outside of security?
Yes. The PB256 Series is also widely used in water utilities to provide reliable DC backup for RTUs and telemetry systems. In telecommunications, it is commonly deployed to power small DC loads such as 4G/5G range extenders within building networks and compact radio repeaters, where backup continuity is essential.
Q: Where can I buy a PB256?
PB256 units are sold across New Zealand via a network of Powerbox resellers.
Q: I’ve disconnected the battery in my system, but an alarm has not been triggered. Is there a problem with my power supply?
No. The PB256 Series does not have a dedicated battery disconnection alarm. If you require this functionality, please consider the use of the Powerbox PB356 Series or PB251A Series, both of which include this capability.
Moving Forward
While newer Powerbox platforms introduce advanced diagnostics and DIN-rail options, the PB256 remains a cornerstone of our DC-UPS range. Its installed base of more than 70,000 units across New Zealand and Australia is a testament to the confidence the security industry places in it.
Other manufacturers have tried to copy the PB256, but none have matched its field performance, lifecycle support, and industry trust. It is often copied, but never replaced.
Why Powerbox?
At Powerbox, we continue to invest in the PB256 Series as the backbone of electronic security power. Whether you are designing a new access control system, refreshing existing infrastructure, or managing large-scale rollouts, you can rely on the PB256 for long-term stability.
Contact Powerbox today to discuss your access control power requirements, or to learn how the PB256 and our broader DC-UPS range can support your projects.
