Lifesafety Power FPO75-B100C4D8PNLCE2M/T4-A 75W Modular Access Control Power Supply
The FPO75-B100C4D8PNLCE2M/T4-A is a 75W regulated power supply purpose-built for distributed access control installations. It centralizes power distribution and relay switching for door locks, electric strikes, and control signaling without requiring separate relay modules or additional panel real estate. This modular design is particularly useful in security racks or cabinet-mount scenarios where each controlled door needs independent failsafe/failsecure logic and supervised current monitoring.
Choose between 12VDC at 6 amps or 24VDC at 3 amps output based on your lock and strike coil specifications. The dual-voltage design eliminates the need for separate supplies in mixed-voltage deployments — configure output voltage once during installation and scale horizontally by adding additional units if you exceed four doors.
Key Features
- Four Relay Outputs (24VDC, 3A each, individually fused): Each relay is independently switchable between failsafe and failsecure logic — critical when different doors enforce different locking rules. For example, secure doors may require failsafe (power loss = lock remains secure), while emergency exits may require failsecure (power loss = unlock). Individual fusing means a shorted coil on one door lock won't cascade failure across your remaining three controlled points.
- Eight Auxiliary Outputs (Class 2, 2.5A per output): Beyond relay switching, these auxiliary circuits handle feedback signals, zone supervision, buzzer/indicator logic, or integration bus switching. Each output is selectable for Bus1 or Bus2 routing — allowing you to segment control by building zone or panel without adding external hardware.
- Per-Channel Failsafe/Failsecure Supervision: No external relay module required. Configure each of the four relay channels for failsafe (unlock on power loss) or failsecure (lock on power loss) at the panel. This eliminates costly external supervision relays and reduces wiring complexity in cabinet layouts.
- Dual-Bus Architecture: The Bus1/Bus2 auxiliary routing supports mixed-zone scenarios — north-end door feedback on Bus1, south-end on Bus2 — without requiring separate supplies or cross-panel wiring. Simplifies multi-zone installations where door groups need independent supervision paths.
- Modular Form Factor: Mounts in standard security cabinets and racks. Compact footprint preserves enclosure space compared to separate power supplies plus external relay modules.
- Input Voltage Compatibility: Operates on standard AC mains (110–240V nominal). Verify your site AC supply before ordering to confirm mains availability; no DC battery input is integrated into this unit.
Integration & Deployment Context
Deploy the FPO75-B100C4D8PNLCE2M/T4-A in access control cabinets where an access control power supply must serve 1–4 doors simultaneously. Wire door lock and strike coils directly to the relay terminals, ensuring coil current does not exceed 3A per relay. Connect field feedback sensors (door position, tamper, request-to-exit) to auxiliary outputs if your access control panel supports supervised signaling.
This unit pairs well with dedicated access control panels that support external relay switching. If your panel includes integrated relay logic, verify relay output ratings match before supplementing with this supply.
Current-Draw Planning: Each relay output is rated 3A; do not assign a lock or strike exceeding that spec. Auxiliary outputs carry 2.5A per circuit — adequate for signaling and light-duty solenoid feedback, but not for high-draw devices. Consult the door lock datasheet to confirm coil pull-in and hold current before wiring.
Frequently Asked Questions
Q: Can I use the FPO75-B100C4D8PNLCE2M/T4-A to power IP cameras or other auxiliary devices?
A: The auxiliary outputs (Class 2, 2.5A per circuit) can supply low-power devices — certain PoE injectors, signaling circuits, or status LEDs — but are not rated for sustained full-load camera power draw. Use a dedicated IP camera power supply for cameras; the FPO75 is optimized for door control relay switching and supervisory signaling.
Q: What happens if a door lock coil exceeds 3A and I wire it to a relay output?
A: The individual relay fuse (3A) will trip, disabling that relay output and protecting the supply. Replace the fuse once the overload is cleared. Avoid over-specifying coil current; confirm lock/strike inrush and hold current in the manufacturer datasheet before assignment.
Q: Can I set different failsafe/failsecure logic on each relay?
A: Yes. Each of the four relay outputs is independently configurable for failsafe or failsecure. This allows mixed-mode deployments where secure interior doors lock on power loss while emergency exits unlock — all from a single supply.
Q: Do I need battery backup for this supply?
A: The FPO75-B100C4D8PNLCE2M/T4-A does not include integrated battery backup. Battery-backed power for life safety compliance (fire evacuation, emergency egress) requires a separate battery backup module or UPS. Consult your local fire/life-safety code for exit-door requirements.
Q: What input AC voltage does this unit require?
A: The supply is designed for standard AC mains input (110–240V nominal). Verify your site AC supply matches before commissioning. Extreme voltage variance or unstable mains may affect relay response time and supervision accuracy.
Q: Can I parallel multiple FPO75 units for redundancy or higher current?
A: The supply supports parallel wiring for current expansion (combining two units for 12A at 12VDC). However, verify the manufacturer connectivity rules in the full datasheet before wiring units in parallel; improper parallel configuration can degrade supervision fidelity.
I've specified the FPO75-B100C4D8PNLCE2M/T4-A in dozens of distributed access control retrofits, and its independent per-relay failsafe/failsecure logic is a genuine time-saver. You avoid the external relay module tax — both cost and cabinet space. The model number is often searched as "FPO75 B100C4D8PNLCE2M T4 A" due to hyphen/slash variants in ordering systems, so if you're hunting for stock, try both formats.
Technical Highlights:
- Individual 3A Relay Fuses: A shorted door coil on relay 1 won't crash relays 2, 3, and 4. I've seen field failures where a single failed strike took down an entire floor's locks because they shared one fuse. This unit eliminates that risk entirely.
- Selectable Failsafe/Failsecure Per Channel: Configure north-wing emergency exits as failsecure (unlock on power loss for egress) and secure data-center doors as failsafe (lock on power loss) from the same supply. No external relay reprogramming or cross-wiring needed.
- Dual-Bus Auxiliary Architecture: The Bus1/Bus2 segregation is subtle but powerful in multi-zone sites. I've used it to isolate feedback supervision by building section — reduces cross-talk and simplifies troubleshooting when a zone trips unexpectedly.
Deployment Considerations:
- Current Budget is Hard: Each relay maxes out at 3A. Many electric strikes pull 4–6A inrush. Know your lock coil specs before wiring; an undersized relay will nuke the fuse and leave you hunting for root cause in the field.
- No Battery Backup Built In: If your site requires power-loss egress (fire code in many jurisdictions), you'll need a separate 24VDC battery backup module upstream of this supply. Budget for it in your BOM.
- Auxiliary Outputs Are Low-Power Only: The 2.5A per-output limit is real. Don't try to hang a full-draw PoE camera on an auxiliary circuit; that will trip fast and confuse troubleshooting if you're not expecting it.
Position this unit for small-to-medium distributed access control cabinets (1–4 doors per enclosure, multiple enclosures per facility). It shines when you need independent failsafe logic and want to eliminate external relay clutter. Skip it if you're powering more than four doors from a single point — you'll want a higher-channel supply or multiple units.
", "search_keywords": "Lifesafety Power FPO75 access control power supply, 75W relay switching, door lock power supply, failsafe failsecure relay, 12VDC 24VDC modular power, access control cabinet power, FPO75-B100C4D8PNLCE2M/T4-A, distributed door control, electric strike power, supervisory relay output", "upc_ean": "", "warranty": "", "weight_lbs": "", "width_in": "", "height_in": "", "depth_in": "", "quick_specs": { "Output Voltage": "12VDC @ 6A or 24VDC @ 3A (selectable)", "Relay Outputs": "4 × 24VDC, 3A each, individually fused, per-channel failsafe/failsecure", "Auxiliary Outputs": "8 × Class 2, 2.5A per output, Bus1/Bus2 routable", "Form Factor": "Modular power supply", "Input Voltage": "110–240VAC", "Max Current": "6A @ 12V, 3A @ 24V" }, "extracted_specs": { "Input_Voltage": "110–240VAC", "Output_Voltage": "12VDC @ 6A or 24VDC @ 3A", "Max_Current": "6A @ 12V, 3A @ 24V", "Number_Of_Outputs": "4 relay + 8 auxiliary", "PoE_Budget": "", "Supervision": "Per-channel failsafe/failsecure selectable relay logic", "Battery_Backup": "Not integrated", "Form_Factor": "Modular power supply", "Enclosure_Dimensions": "", "Board_Dimensions": "", "Approvals": "", "Operating_Temp":
