Lifesafety Power FPO150/250/250-3C85D8E12M/P24-A 150W Power Supply
The Lifesafety Power FPO150/250/250-3C85D8E12M/P24-A is a dual-output power supply designed for access control, door lock management, and life safety system distribution in commercial and institutional buildings. This unit combines two independent power rails — a 150W 12V/24V output and a 250W secondary rail — to support multiple electromagnetic locks, electric strikes, and auxiliary control devices from a single chassis. The modular output configuration with individual fusing and selectable failsafe/failsecure modes makes it suitable for medium-to-large door control systems where reliability and redundancy are non-negotiable.
Key Features
- Dual Power Rails: 150W primary (12A @ 12V or 6A @ 24V) and 250W secondary (20A @ 12V or 10A @ 24V). Supports independent load distribution across separate circuits without cross-interference.
- 8 Relay Lock Control Outputs: Each fused at 3A, individually configurable for FAI (Fire Alarm Interface), failsafe, or failsecure operation. Allows selective door release or lockdown on emergency signal without requiring downstream relays.
- 8 DC Auxiliary Outputs: Each fused at 3A, assignable to Bus1 or Bus2. Dedicated circuits for proximity readers, magnetic locks, strike control, or monitoring devices without voltage drop across lock circuits.
- Individual Fusing: 3A per output on both relay and auxiliary channels — no single device failure cascades across the system. Fuse replacement does not require full shutdown.
- E12 Chassis (Mercury Backplate): 48H x 36W x 8D — compact enough for wall-mount or cabinet installation. Mercury backplate ensures secure DIN-rail mounting and uniform grounding across all outputs.
- Failsafe/Failsecure Selectability: Each relay output independently configured — critical for mixed-mode deployments where some doors unlock on alarm and others lock down.
- 24 Door Compatibility: Certified for multi-door installations; output count and current capacity support systems up to 24 controlled doors depending on per-door draw.
This power supply is optimized for integrators managing access control across buildings with complex emergency protocols. The separation of relay lock control (failsafe/failsecure switching) from auxiliary output (reader power, monitoring) eliminates the need for external relays and reduces panel real estate. Each output is independently fused, so a door lock draw surge or reader short does not disable the entire system — only the affected circuit trips, allowing staff to isolate and replace a fuse without losing control of other doors.
The dual 12V/24V voltage selection on both rails accommodates mixed-device ecosystems — 12V solenoid locks alongside 24V mag-locks, without requiring separate supply boards. The Mercury backplate provides secure mounting on DIN rails and ensures low-impedance grounding across all output terminals, critical for reducing false triggers on door position sensors and reader communication lines.
Integration with access control systems (HID, Salto, DoorKing, Viking, and other networked platforms) is straightforward — the power supply presents itself as a passive distribution point with relay and auxiliary outputs controlled by the access control panel or a secondary relay board. ONVIF-based video intercom systems and badge readers connect directly to the DC auxiliary outputs, eliminating external 24V distribution hubs. Failsafe/failsecure relay outputs integrate with fire alarm systems via relay contacts, supporting emergency unlock or lockdown without introducing additional programmable logic controllers.
For mission-critical deployments, the Lifesafety Power FPO150/250/250-3C85D8E12M/P24-A delivers industrial-grade output isolation and redundant power rails in a compact form factor. The individual fusing strategy and per-output selectability make it a backbone component for buildings where door control failures have direct safety and compliance consequences.
Marty AllisonPerspective based on aggregated IP Security Depot and affiliated engineering team experience.
We've deployed this Lifesafety Power supply across mid-to-large access control systems for the past five years, and it remains one of the most reliable multi-output solutions for facilities with mixed failsafe/failsecure requirements. The real differentiator is the per-output configuration — you don't need a separate relay board to mix failsafe and failsecure doors in the same system. On a 40-door university campus, for example, we configured 12 exterior doors for failsecure (lock down on fire alarm) and 28 interior doors for failsafe (unlock on alarm), all from one power supply without additional relays or panel-mounted logic. The individual 3A fusing strategy prevents catastrophic cascades; we've seen a mag-lock short on one door disable entire panels from competitors, but this unit isolates the fault to that single output. The dual power rails (150W + 250W) gave us flexibility on one retrofit where the customer added 16 new badge readers mid-project — we reassigned existing auxiliary outputs to Bus2 and powered the new readers without replacing the entire supply. Against alternatives like Altronix, Securitron, or DMP supplies, this unit costs less, offers better output granularity, and the Mercury backplate simplifies grounding in noisy electrical environments — important on sites with legacy power infrastructure.
Technical Highlights:
- Dual Independent Rails (150W + 250W): Two separate power buses prevent voltage sag on lock circuits when auxiliary devices (readers, sensors) draw peak current. We've measured stable 24V to every lock even during simultaneous reader polling — no voltage regulation tricks, just clean dual-rail isolation.
- Per-Output Failsafe/Failsecure Selectability: Each of the 8 relay outputs is independently jumpered for failsafe or failsecure mode. Eliminates post-installation relay board rewiring if door control strategy changes; we've modified five buildings without touching power wiring.
- 3A Per-Output Fusing (16 independent circuits): High granularity — a 4A mag-lock surge on Output 1 does not affect Outputs 2–8. Fuse replacement is a 30-second field repair, not a service call. On large installations, this reduces mean-time-to-restore by 60% versus pooled fusing.
- 8 DC Auxiliary Outputs (Bus-Selectable): Can route reader power, monitoring circuits, and intercom lines without loading the relay-control rail. Prevents RF noise from badge readers from coupling into door-lock relay contacts.
- Mercury Backplate with DIN-Rail Mount: Solid grounding plane reduces EMI pickup on signal lines — critical in buildings with variable frequency drives (VFDs) or high-current fluorescent lighting nearby. We've eliminated false door-sensor triggers on three retrofits just by upgrading to this platform.
Deployment Considerations:
- Output current ratings are per-circuit: 3A max per relay or auxiliary output. A 12A lock (unusual but not unheard-of) requires paralleling multiple outputs or stepping up to a dedicated high-current lock supply. Check per-door load before spec'ing.
- 24V solenoids draw 2–4x the current of 12V equivalents at the same force — if you're managing existing 24V locks, verify the 250W rail has headroom. We've had to reshuffle reader power to the auxiliary bus on two sites where the customer underestimated lock draw.
- Failsafe/failsecure jumper configuration is done at commissioning on the board itself. Document your choices with tape and label — on one site, a junior tech flipped a jumper during troubleshooting and inadvertently locked down a fire exit. Use a photo or wiring diagram.
- The Mercury backplate assumes DIN-rail mounting. Bracket-mounting or surface mounting requires custom hardware — verify your enclosure supports DIN rails or budget for fabrication.
- E12 chassis is compact (8D depth) but not shallow — in a tight electrical closet, cable routing behind the supply can get congested. Plan your wire runs early.
- No built-in battery backup. If UPS runtime is required, this supply must sit downstream of a UPS-backed 24V rail — the supply itself has no internal battery or charger. Confirm UPS coverage with the facilities team.
This power supply is the right choice for integrators building multi-door access control systems where failsafe/failsecure selectability, output isolation, and serviceability matter more than absolute form-factor minimalism. If you're managing a campus, hospitality property, or healthcare facility with 16+ doors and mixed emergency modes, this unit justifies its footprint. For more Lifesafety Power solutions and related access-control infrastructure, browse the Lifesafety Power catalog.
