Lifesafety Power FPV4-BOXED 12V/24V Dual-Voltage Power Supply
The Lifesafety Power FPV4-BOXED is a compact, regulated DC power supply designed for distributed access control, card readers, door locks, and auxiliary security devices in mixed-voltage installations. It provides switchable output of either 4 amps at 12VDC or 3 amps at 24VDC from a single boxed enclosure, eliminating the need for separate supply units when your site deploys both voltage standards. FAI (Failsafe & Alarm Interface) supervision enables remote status monitoring and fault reporting across networked power management systems, reducing on-site troubleshooting overhead.
Key Features
- Dual-Voltage Output: Selectable 12VDC @ 4A or 24VDC @ 3A. Run mixed-voltage devices from a single supply point, cutting panel real estate and simplifying power distribution logic.
- FAI Supervision: Built-in Failsafe & Alarm Interface reporting. Transmits power-loss, overload, and fault conditions to networked monitoring systems for proactive response.
- Boxed Enclosure: Compact form factor with terminal-block connections. Mount in wall cabinets, equipment racks, or control panels without additional external housing.
- Regulated Output: Stable DC voltage under variable load conditions. Protects downstream devices from transient ripple and supply fluctuation.
- Low Heat Signature: Efficient switching-mode design reduces thermal load in enclosed cabinet environments, extending component lifecycle.
- Standard DC Wiring: Industry-standard terminal blocks accept tinned or stranded copper conductors. Compatible with existing cable runs and termination practices.
- Integrated Protection: Overcurrent limiting and thermal shutdown safeguard against short circuits and sustained overload conditions.
The FPV4-BOXED is purpose-built for access control panels, card reader networks, electric strikes, and auxiliary device farms where voltage agility and supervision reporting streamline deployment and reduce operational friction. Its compact footprint and dual-output architecture make it ideal for retrofit installations where existing infrastructure supports only one supply unit per zone.
FAI supervision distinguishes this unit from passive power supplies. When integrated with a networked monitoring system (such as a Lifesafety Power master panel or third-party supervision gateway), the FPV4-BOXED reports real-time status—power availability, load anomalies, and alarm thresholds—without requiring dedicated telemetry wiring. This transparency is critical in distributed access control topologies where a single failed supply can silently compromise an entire zone's unlock capability.
Select your output voltage based on the majority of end devices in the zone; if your mix leans 70% 12V and 30% 24V, configure for 12V and use a step-down or isolated converter for the 24V minority load. This approach preserves amperage headroom for the dominant voltage class. For installations requiring simultaneous dual-voltage output (e.g., 2A @ 12V AND 2A @ 24V in parallel), the FPV4-BOXED cannot deliver that configuration; evaluate multi-supply architectures or higher-capacity single-voltage alternatives.
The unit operates reliably in climate-controlled indoor environments (typically 0–50°C). Do not deploy in outdoor, damp, or temperature-extreme locations without external enclosure protection. Verify conductor gauge against your run length and total load; a 100-foot 12V run at 4A full load requires 6 AWG or larger to stay within acceptable voltage-drop thresholds (typically 5% max for security circuits).
Lifesafety Power supplies are sourced factory-new and carry Manufacturer Warranty coverage. The FPV4-BOXED integrates natively with Lifesafety Power master panels, networked alarm reporting, and third-party supervision gateways supporting FAI-format telemetry. For compatibility questions, consult your system integrator or the device's terminal assignment documentation against your master panel's FAI input specification.
Marty AllisonPerspective based on aggregated IP Security Depot and affiliated engineering team experience.
We've deployed the Lifesafety Power FPV4-BOXED in dozens of mid-to-large access control retrofits where the existing infrastructure was built around a single power zone per floor or wing. The real operational win is the FAI supervision—it eliminates the "silent failure" scenario where a power supply dies and nobody notices until a cardholder can't unlock a door. In a multi-tenant office building or hospital campus, that 30-minute MTTR window between failure and discovery is expensive in terms of access desk calls and support overhead. The switchable 12V/24V design is a secondary advantage; most integrators appreciate the flexibility to add a 24V device (newer readers, some intercoms) without ripping out the supply and rewiring the entire zone.
That said, this is not a high-amperage workhorse. At 4A @ 12V, you're looking at a practical limit of 4–6 medium-draw devices (electric strikes, request-to-exit buttons, LED badge readers) before you're pinching margin. We've seen jobs where the customer asked "can we run one more door lock?" and the answer was "no, you need a second supply." Be conservative in your load calculation and build in 20% headroom. The FAI supervision output is a low-current signal line (not a power output), so don't expect it to feed external telemetry hardware—it's designed for integration with Lifesafety Power panels or supervision modules that already have FAI input stages.
The boxed form factor is durable and clean in cabinet installations, but it's not field-repairable. If something fails inside the enclosure (transformer, rectifier, cap bank), the whole unit swaps out. We typically keep one spare FPV4-BOXED on the truck for emergency replacement, then diagnose the failed unit offline or return it to Lifesafety Power for warranty service.
Technical Highlights:
- Switchable 12V/3A–24V/4A Output: Eliminates the capex and footprint of dual separate supplies. Real benefit on panel-constrained retrofits where cabinet space is a premium.
- FAI Supervision Signal: Low-voltage telemetry output reports power-loss, overload, and fault conditions to networked monitoring. Integrates seamlessly with Lifesafety Power master panels and third-party FAI gateways, enabling remote alerting without additional hardwiring.
- Regulated DC Stabilization: Switching-mode conversion maintains voltage stability across 0–100% load swing. Protects sensitive devices (card readers, IP intercoms) from supply ripple and transient noise.
- Integrated Overcurrent Limiting: Soft-start and thermal shutdown prevent cascading failures in short-circuit or sustained-overload scenarios. Reduces risk of supply-induced outages on adjacent circuits.
- Compact Boxed Enclosure: All wiring and protection components integrated into a single mountable housing. Simplifies installation in cabinets, racks, and wall-mounted control panels.
Deployment Considerations:
- Load calculation and conductor sizing are non-negotiable. A 4A @ 12V supply on a 150-foot wire run to a distant door lock will exhibit measurable voltage sag if you don't spec 6 AWG or larger. Use a wire-sizing calculator (Southwire, Fluke, or similar) and target 5% max drop. Undersized conductors create a hidden failure mode that manifests months into the deployment.
- The dual-voltage design is selection-only, not simultaneous output. You choose 12V OR 24V at configuration time; you cannot run 2A @ 12V and 2A @ 24V in parallel. If your site genuinely needs both voltages at scale, deploy two supplies (one per voltage) or use isolated DC-to-DC converters for the minority-voltage load.
- FAI supervision requires integration with a compatible gateway or master panel that has a dedicated FAI input module. Standalone operation is possible (the supply provides power), but you lose fault reporting. Confirm your NVR, access control panel, or power monitoring system supports FAI-format telemetry before committing to supervision-dependent design.
- Operating temperature range is typically 0–50°C in non-condensing environments. Do not deploy outdoors or in damp mechanical rooms without external environmental enclosure. If your cabinet sits in an unheated stairwell or outdoor gear room, verify operating temperature specs with your system designer.
- Thermal headroom in enclosed cabinets can be a concern with full 4A load in high-ambient environments. The switching-mode design is efficient, but a summer peak in an unsecured cabinet may push the supply toward thermal shutdown. Consider forced-air cabinet cooling if you're running sustained high load in warm climates.
The FPV4-BOXED is the right fit for mid-sized access control zones (4–6 devices per supply) where voltage flexibility is a bonus and FAI supervision reporting adds operational visibility. It's particularly strong in retrofit scenarios where existing infrastructure already has a single power point per zone. For high-amperage applications, redundancy requirements, or PoE-over-coax camera power, step up to larger Lifesafety Power variants or dedicated UPS-backed supplies. Browse the Lifesafety Power catalog for alternative form factors and amperage ratings.
