Lifesafety Power FPO250-B1002C82D8E8M1 250W Power Supply Board
The Lifesafety Power FPO250-B1002C82D8E8M1 is a dedicated 250W power supply board designed for distributed access-control installations, electric-strike systems, and door-lock clusters. The board delivers dual primary voltage outputs (20A @ 12V or 10A @ 24V selectable) plus a class 2 limited-power auxiliary channel, eliminating the need for separate transformer chains in mid-scale deployments. Integrators deploy this board to centralize lock power and control signaling on a single enclosure, reducing panel congestion and troubleshooting time on multi-door Mercury or Lenel access-control backplates.
Key Features
- Primary Output Options: 20A @ 12V or 10A @ 24V (field-selectable). Accommodates both legacy 12V strike systems and modern 24V access controllers without dual power supplies.
- Auxiliary Class 2 Output: 5-18V adjustable @ 4A maximum. Powers sensors, proximity readers, and low-draw peripherals on a separate, fault-isolated rail.
- 16 Relay Lock Control Outputs: Each fused at 3A. Direct lock-driving capacity without requiring intermediate relay modules; simplifies wiring on systems with 8+ doors.
- 16 Auxiliary DC Outputs: Each fused at 3A independently. Isolated power for door sensors, tamper switches, and request-to-exit (REX) buttons without load crosstalk.
- Integrated Enclosure: 30W × 36H × 4.5D steel housing with Mercury/Lenel backplate mounting and pre-drilled door-mount kit. Field-installable on standard rack rails or DIN-rail cabinets.
- Class 2 Power Limitation: Compliant with NEC/UL Class 2 power-limited output design; reduces wire gauge requirements and simplifies conduit routing for auxiliary circuits.
- Fused Distribution: 32 independent 3A fuses (16 relay + 16 auxiliary) minimize impact of downstream short circuits; a failed strike or sensor doesn't cascade into full system loss.
The FPO250-B1002C82D8E8M1 consolidates lock power distribution that would otherwise require three or four separate power supplies and relay modules in a typical 12-door facility. The dual primary voltage selection handles retrofit projects where legacy 12V strike hardware coexists with newer 24V controllers on the same backplate. Field adjustability of the auxiliary output (5–18V) supports mixed-voltage sensor networks — door contacts, motion detectors, and wireless transmitters all on one isolated rail.
Integrators specify this board into Mercury- or Lenel-based access-control systems where the primary controller lacks sufficient lock-drive capacity or where distributed power nodes are preferred over centralized 8–16 output relay banks. The pre-fitted enclosure eliminates assembly labor on site; most installations are terminated and powered within 2–3 hours. The 3A per-output fuse design is critical in high-density door clusters: a stuck solenoid or short on one lock doesn't black out the remaining 15 circuits, and field isolation troubleshooting becomes a matter of testing individual fuses rather than power-cycling the entire board.
Mercury and Lenel integrators will recognize the backplate form factor immediately; this board drops onto existing wiring harnesses without adapter panels. The class 2 auxiliary output is particularly valuable in facilities mixing line-voltage door sensors (older installations) with low-voltage proximity readers and REX buttons (modern expansions). No external transformers needed for sensor power — the board's internal isolation and current limiting eliminate nuisance breaker trips and ground-loop faults that plague improvised transformer chains.
Marty AllisonPerspective based on aggregated IP Security Depot and affiliated engineering team experience.
We've deployed the Lifesafety Power FPO250-B1002C82D8E8M1 across dozens of Mercury and Lenel access-control installations, and it consistently solves a specific integrator pain point: the need for affordable, space-efficient lock power distribution on mid-scale door clusters (8–16 doors) without redesigning the entire control backplate. The real differentiator is the independent fusing. In our experience, when you pack 16 lock circuits into a single enclosure, you need electrical isolation between circuits — not just circuit breakers. A stuck electric strike on door 5 shouldn't take down the sensor power feeding doors 1–4 and 9–16. This board's 32 independent 3A fuses (one per relay, one per auxiliary output) mean that a fault on a single circuit pops only that fuse. We've seen field technicians waste hours troubleshooting intermittent lock failures on systems where all 16 circuits shared a single 30A breaker; fuse-per-output design eliminates that problem entirely.
Technical Highlights:
- Dual Primary Voltage (12V/24V selectable): Retrofit compatibility in one board. Facilities migrating from 12V strike hardware to 24V controllers can phase in new locks incrementally without staging two separate power supplies or rewiring the backplate.
- 5–18V Adjustable Auxiliary Rail (4A max): Not all sensors operate at 12V or 24V; door motion detectors, some proximity readers, and wireless transmitters run 12–15V. Field-adjustable auxiliary voltage eliminates the need for step-down converters or external regulators, reducing BOM and field failures.
- 16 Relay Outputs + 16 Auxiliary Outputs (independent fusing): Relay outputs drive lock solenoids directly (3A per output = 48A total lock capacity). Auxiliary outputs power sensors and low-draw peripherals on a separate, isolated rail. Total of 32 independently fused circuits means granular fault isolation — a short on one lock doesn't cascade.
- Mercury/Lenel Backplate Mount: Direct form-factor compatibility eliminates adapter panels and reduces wiring complexity. The board terminates onto existing harnesses; no intermediate relay modules needed for most 8–16 door layouts.
- Class 2 Power Limitation Compliance: NEC/UL Class 2 design allows lighter-gauge (18 AWG) wiring for auxiliary circuits and sensors, reducing conduit fill and labor cost in retrofits where existing conduit is at capacity.
Deployment Considerations:
- Primary voltage selection is field-jumper configurable but not switch-selectable; audit the backplate specification sheet before ordering to confirm whether your locks are 12V or 24V. Mixing lock voltages on the same board requires external relay modules, which defeats the consolidation benefit.
- The 250W rating assumes balanced loading across primary and auxiliary outputs. If you're driving eight 24V locks at full strike current (8A each = 192W just for locks), you have only 58W left for auxiliary circuits. Size the load carefully on high-lock-count installations; if you need more than 20A of primary current, migrate to a larger Lifesafety Power platform (e.g., FPO500-series).
- The 3A per-output fuse is appropriate for a single electric strike (typical draw 1–2A continuous, 3–5A inrush). Door sensors and REX buttons are typically <0.5A. Monitor inrush current on strike testing; if inrush exceeds 5A, substitute a slightly higher fuse rating or stagger power-on sequencing.
- Enclosure mounting: the 4.5-inch depth is snug on older Mercury panels with limited back space. Verify cabinet dimensions before ordering; if space is constrained, consider wall-mount or DIN-rail configuration using the included mounting kit.
- The board does not include battery backup or UPS integration. If backup power is required for emergency unlock on power loss, you'll need to integrate an external battery backup module; factor that into system architecture and total cost of ownership.
The Lifesafety Power FPO250-B1002C82D8E8M1 is the right fit for integrators managing mid-scale Mercury or Lenel deployments where consolidation, fault isolation, and retrofit speed are the top priorities. For a detailed spec review and integration questions, see the Lifesafety Power catalog.
