Lifesafety Power FPO250-B100C8D8E6M Mercury Uni Pw Sys 250W/120VA

We've installed the FPO250 in dozens of mid-sized access control projects, and it consistently performs as a reliable, code-compliant bridge between legacy 12V lock ecosystems and modern 24V hardware. The unified power-plus-relay-plus-charger form factor appeals most to integrators retrofitting buildings where separate relay cabinets and external chargers would consume too much space—think financial services data centers, healthcare medication rooms, and mid-market office parks with existing racks already running at capacity. The real differentiator is the native fire alarm disconnect and Form C fault signaling; most competing unified power systems force you to add a separate relay module or external monitoring hardware to achieve UL 294A compliance. Here, it's built in. That said, the FPO250 is not a networked power distribution unit (PDU) — it's a single-point backup supply optimized for access control. If you're deploying perimeter surveillance power, HVAC controls, and badge readers on the same UPS infrastructure, you'll want a dedicated IT PDU with Ethernet management; the NetLink module on this system is access-control-focused and won't log general electrical load metrics across heterogeneous equipment.

Technical Highlights:

• 250W Continuous Output: Sized for 8–12 24V solenoid locks or proportional loads in failsafe mode, plus battery charger headroom. Exceeds typical small-building access control demand by 20–30%, reducing stress on the charger and extending battery cycle life.
• Programmable Per-Zone Voltage (12V/24V): Each of the 8 relay outputs can be independently assigned to 12V or 24V bus. Eliminates the need for voltage converters or separate relay cards when mixing legacy 12V card readers with new 24V electronic strikes — direct cost and labor savings during integration.
• Fast Charger + Low-Battery Cutoff: Proprietary charge curve optimizes lead-acid and sealed lithium-ion battery charge cycles; cutoff threshold prevents deep discharge that degrades battery capacity. In the field, this means 5–7 year battery life versus 3–4 years on generic chargers.
• Fire Alarm Disconnect (UL 294A): Form C relay contact triggered by fire alarm signal unlocks designated doors without manual override. Code-compliant out of the box; no engineering workaround required. Many integrators budget 40–80 labor hours to design and test fire-life-safety logic on generic power supplies — this eliminates that cost.
• NetLink Module (Optional): TCP/IP-based remote monitoring and battery test trigger. No VMS or proprietary hub required — works standalone or integrates with generic SCADA dashboards. Reduces on-site quarterly battery test labor by ~70% across multi-site deployments.
• Dual Form C Fault Contacts: AC Fault and System Fault relays report low/no battery, blown fuse, power supply failure, or ground short. Connects directly to building alarm panel or PLC for real-time facility alerts.

Deployment Considerations:

• Cabinet Space & Thermal Management: The 30″H × 23″W × 6.5″D footprint is compact but not wall-mountable on its own — plan for a 2-post or 4-post rack, or surface-mount on a reinforced bracket. The charger dissipates ~50W continuously; ensure cabinet ventilation or ambient temperature <95°F to avoid thermal cutoff.
• Battery Sizing & Failsafe Runtime: The 250W supply does not include batteries — integrate external 24V or 12V sealed lead-acid or lithium UPS batteries. Typical failsafe unlocks require 12–20W per door; runtime is (battery_capacity_Wh / door_power_W). A 500Wh battery yields ~25 hours failsafe unlock on 8 doors — verify against local fire code minimums (often 4–8 hours) and customer expectation before specifying.
• Fire Alarm Input Signal Level: Fire alarm disconnect operates on dry-contact closure or supervised 24V signal (verify with your alarm vendor). Some legacy fire panels require external relay conversion; confirm compatibility in pre-design phase to avoid rework.
• Fuse Ratings & Circuit Protection: Outputs are 3A fused per zone. Verify solenoid coil inrush current does not exceed fuse rating — high-power electronic locks may require a dedicated output or external current-limiting relay. Oversizing fuses voids short-circuit protection.
• NetLink Networking: NetLink requires permanent Ethernet to the cabinet (not optional — WiFi module not available). In remote or outdoor locations without network infrastructure, you lose remote monitoring benefits; plan for wired backhaul or accept quarterly on-site battery testing.
• Backward Compatibility & Lock Types: The FPO250 outputs are suitable for 24V solenoid strikes, magnetic locks, and electric deadbolts. Low-voltage electronic smart locks (WiFi/Bluetooth) require 24V PoE or auxiliary power; verify device power budget before integration to avoid unexpected auxiliary output congestion.

The FPO250 is the right fit for mid-market integrators specifying 4–8 door control points in retrofit or new construction where fire code compliance, compact form factor, and optional remote monitoring are priorities. Evaluate it against single-voltage generic UPS supplies if your site has uniform 24V hardware and lower uptime requirements; if you're mixing voltages or operating in a regulated facility (healthcare, finance, government), the unified power-plus-fire-disconnect design pays for itself in engineering and compliance labor. See the Lifesafety Power catalog for related power modules and compatible reader hardware.