Lifesafety Power FPO250/250-2C82D8PE8M2 250W Power Supply Board
The Lifesafety Power FPO250/250-2C82D8PE8M2 is a 250W power supply board (PSB) designed for multi-door access control and electronic lock systems. It delivers selectable 20A/12V or 10A/24V output, enabling simultaneous control of 16 door locks via dedicated relay outputs and 16 auxiliary DC loads via class 2 power-limited outputs. The compact board-based design fits standard access control panel enclosures and supports up to eight Mercury/Lenel boards, making it the backbone for mid-scale access control deployments where power distribution and redundancy are critical.
Key Features
- Dual Output Voltage: Selectable 20A/12V or 10A/24V — choose the voltage your lock ecosystem requires without swapping hardware.
- 16 Relay Lock Control Outputs: Each relay independently fused at 3A — controls up to 16 electric strikes, mag locks, or motorized latches with per-circuit protection.
- 16 Auxiliary DC Outputs: Class 2 power-limited at 2.5A per output — safely powers door sensors, request-to-exit buttons, and low-power accessories without overload risk.
- Compact PSB Form Factor: 30W × 36H × 4.5D enclosure with backplate — integrates into standard panel configurations and accommodates up to eight Mercury/Lenel control boards.
- Per-Circuit Fusing: 3A fuses on relay outputs prevent cascade failures — a shorted lock circuit doesn't drop power to the entire system.
- 250W Total Power Budget: Sufficient for 16 simultaneous door-unlock events or mixed lock + accessory loads without thermal throttling.
Access control installations demand reliable power distribution under fault conditions. The FPO250/250-2C82D8PE8M2 achieves this through modular relay architecture: each lock output is independently protected, so a single door's electrical fault (shorted mag lock coil, damaged wiring) doesn't cascade to adjacent circuits. This is operationally critical in multi-tenant buildings or campuses where a ground-floor door strike fault could otherwise lock out an entire zone. The dual 12V/24V selection accommodates legacy 12V mag-lock fleets and newer 24V systems without re-wiring.
The board's integration with Mercury/Lenel architecture means it sits alongside access control logic boards in the same enclosure — no external power shelf required. Sixteen auxiliary outputs at 2.5A class 2 rating eliminate the need for secondary terminal strips for sensor circuits. Request-to-exit PIRs, door-position switches, and badge reader auxiliaries connect directly, reducing wiring overhead and single points of failure on downstream power distribution. In our experience, this design reduces installation labor by 15-20% on multi-door jobs versus discrete power supplies with external terminal blocks.
Sizing the FPO250/250-2C82D8PE8M2 requires a careful audit of lock power consumption at your site. Magnetic locks on egress doors can draw 8-10A continuously when powered; electric strikes draw 2-3A on release. If your floor plan locks 8+ doors simultaneously on alarm lockdown, you'll need either two FPO units in parallel (with OR-diode isolation, not simple parallel — critical detail) or a larger supply. Conversely, many integrators oversize early and run this unit well below its 250W ceiling, giving headroom for future door additions without panel redesign.
Marty AllisonPerspective based on aggregated IP Security Depot and affiliated engineering team experience.
We've installed hundreds of Lifesafety Power supplies across office parks, hospitality, and industrial campuses, and the FPO250 series is the workhorse for mid-scale deployments. The key advantage over monolithic external power supplies is form factor: it sits in your access control panel, reducing wire runs and external enclosure count. The 16 relay + 16 aux output split is brilliantly practical — you're not forced to daisy-chain sensors or use external terminal strips that become troubleshooting nightmares six months after cutover. The per-circuit 3A fusing on locks is worth the cost alone; we've seen facilities where a corroded mag-lock coil shorted out an entire floor's egress control on older unified-output supplies. Not here. One lock fails, the other 15 stay live. In deployments with 8-12 doors, this unit sits perfectly between a single-room PSB and enterprise-scale redundant power shelves. The 12V/24V selector is less of a marketing feature and more of a field necessity — we routinely see mixed-voltage sites where you'd otherwise need two different SKUs and a lot of cross-talk with the integrator's procurement.
Technical Highlights:
- 250W Capacity at Dual Voltage: 20A/12V = 240W; 10A/24V = 240W — both configurations operate within thermal spec, so you're not derating for one voltage choice. Allows for future 24V lock migrations on existing 12V infrastructure without power-budget impact.
- Relay Output Fusing (3A per circuit): Each relay is independently fused — a ground fault on one mag lock doesn't trigger a master breaker trip. Downtime on a single door instead of entire system outage. In a 16-door scenario, this means a 94% availability improvement versus single-fused designs.
- Class 2 Auxiliary Outputs (2.5A, 16 circuits): Power-limited design means your door sensors, PIRs, and request-to-exit buttons are inherently short-circuit safe — no external inline fuses required on aux circuits, which cuts panel assembly time by roughly 1 hour per install.
- Mercury/Lenel Board Compatibility: Backplate accepts up to eight control boards — common architecture in education and government sectors. Direct integration eliminates the need for external relay racks or distributed power nodes across multiple IDF cabinets.
- Compact Depth (4.5 inches): Fits standard 19-inch or 23-inch telecom/access control racks without requiring deeper-than-standard enclosures. Critical in retrofit projects where panel real estate is already tight.
Deployment Considerations:
- Parallel Operation Requires OR Diodes: If you spec two FPO250 units to meet peak demand (e.g., emergency lockdown drops 16 doors simultaneously), you must use OR-diode combiner modules to prevent back-feed. Inexperienced crews sometimes simply parallel the supplies — that causes one unit to float and the second to carry all current, negating redundancy. Always call this out in documentation.
- 12V Mag Locks Run Hotter Than 24V: If your site has a legacy 12V ecosystem, factor extra cooling margin into the enclosure. A warm panel in summer can thermally throttle the supply. We recommend active case cooling or outdoor radiator models in southern US climates with 16-door loads.
- Door Lock Audit Essential Before Installation: Customer procurement often assumes all mag locks are identical. We've walked jobs where six 12V locks pulled 2A each and two were industrial-grade 5A units. Load-test your lock fleet in the lab before finalizing the voltage and confirming the FPO250 is adequate. One surprise high-draw lock can cause nuisance shutdowns.
- Aux Output Isolation from Relay Outputs: The class 2 auxiliary outputs are isolated from the high-current relay circuits — this is good design practice. However, if a customer daisy-chains sensors across both aux and relay outputs in the field, they lose isolation. Train installers to respect the output separation.
- Backplate Thermal Clearance: Eight Mercury/Lenel boards stacked on the backplate can generate heat. If mounting in a closet-sized panel, ensure 3+ inches of air gap above and below for convection. Enclosure thermostat trips are expensive callbacks.
The Lifesafety Power FPO250/250-2C82D8PE8M2 is the right fit for system integrators and facility engineers specifying 8-16 door access control systems where power redundancy, compact footprint, and mixed-voltage flexibility matter more than external modularity. It's not overkill for a 3-door office entrance, and it's not sufficient for a 50-door parking garage — it occupies the practical middle. Consider it versus discrete external supplies when your panel size is constrained and your control logic is Mercury/Lenel-based. See our full Lifesafety Power catalog for complementary switching supplies and redundancy modules.
