Lifesafety Power FPO75-B100C4D8E2S 75W Power Supply
The Lifesafety Power FPO75-B100C4D8E2S is a dedicated access control power supply engineered for mid-scale door control installations, supporting multiple electric lock, strike, and auxiliary device circuits from a single 75W unit. Built around a dual-output architecture (6A/12V or 3A/24V primary output plus independently programmable 5–18V secondary at 4A), this supply integrates lock control relay outputs with fault-isolated auxiliary circuits—eliminating the need for external relay boards in typical deployments. The modular relay and auxiliary architecture allows installers to configure failsafe/failsecure logic and bus allocation on-site without firmware changes, reducing commissioning time and hardware overhead.
Key Features
- Dual Primary Output: 6A/12V or 3A/24V selectable — covers standard electric strike and mag-lock supply ranges without requiring separate supplies for different voltage ecosystems.
- Adjustable Secondary Output: 5–18V DC at 4A max — powers auxiliary sensors, readers, or intercom modules without a separate buck converter.
- 4 Relay Lock Control Outputs: Each fused at 3A, each independently selectable for FAI (Fail As Is), failsafe, or failsecure mode — reduces field wiring complexity for multi-door control logic.
- 8 DC Auxiliary Outputs: Each fused at 3A, each selectable for Bus1 or Bus2 assignment — enables distributed control across two independent circuits without external multiplexing hardware.
- Class 2 Power-Limited Design: Compliant with UL/NEC Class 2 specifications — eliminates NEC Article 300 conduit and separation requirements, lowering installation labor on retrofit jobs.
- Modular Configuration: Relay and auxiliary mode settings configured via on-board jumpers or field-programmable selector switches — no software tools or commissioning ports required.
- Integrated Fusing: Per-output circuit protection (3A fuses on both relay and auxiliary groups) prevents cascading failures when a single lock or device shorts.
The FPO75-B100C4D8E2S addresses a common pain point in mid-scale access control builds: the need to manage multiple voltage domains (12V and 24V lock circuits) and failsafe logic across 4–6 doors without multiplying power supplies and external relay racks. The 75W envelope fits standard electrical enclosures alongside an IP controller or controller-less release logic, and the segregated auxiliary bus (Bus1/Bus2) allows you to isolate high-current lock loads from low-current signal circuits, reducing noise coupling into reader or sensor lines.
Deployment scenarios include corporate office multi-door access clusters (conference rooms, secure floors), apartment building foyer + stairwell + mailroom control, and small retail/warehouse perimeter gate management. The failsafe/failsecure relay configuration is runtime-selectable, allowing a single supply to support mixed security postures (e.g., failsafe egress door + failsecure server room door) without hardware swaps. When paired with a small access control panel or smart lock controller (Salto, Kaba, HID), this supply consolidates power distribution and relay switching into one unit, reducing BOM and panel real estate.
Integration is straightforward for ONVIF-aware or legacy hardwired door control systems. The relay outputs present dry contact closure to standard access control wiring, and the auxiliary outputs accept any 24V DC–compatible sensor or signaling device. No proprietary drivers or middleware are required—the unit operates as a transparent power and relay distribution layer. The modular Bus1/Bus2 split allows you to dedicate one auxiliary bus to reader/sensor signaling and the other to indicator LEDs or remote solenoid drivers, each with independent fuse protection and voltage configuration.
Marty AllisonPerspective based on aggregated IP Security Depot and affiliated engineering team experience.
We've installed hundreds of multi-door access control clusters, and the FPO75-B100C4D8E2S fills a genuine gap: it's a no-frills, hardwired power and relay distribution unit that doesn't require a full-blown networked panel. In environments where a facility manager wants to avoid the complexity of IP-based door logic (older buildings, sites with weak network availability, or cost-sensitive small chains), this supply lets you build a reliable access control backbone using proven relay hardwiring. The dual voltage primary output is the real win—if you've ever had to specify two separate supplies because one building wing runs 12V mag-locks and another runs 24V electric strikes, you know the capex and panel footprint savings immediately. The on-board relay logic selection (failsafe/failsecure per output, not global) is less flexible than a programmable control panel, but for straightforward door-by-door logic, it's honestly all you need, and it eliminates the dependency on firmware updates or controller licensing.
Technical Highlights:
- Dual Selectable Primary Output (6A/12V or 3A/24V): Eliminates the need for separate supplies when mixing voltage-dependent lock technologies. We've seen this reduce panel size by roughly 30% on 4-door builds, and the selector switch means field voltage swaps take seconds, not a supply swap and re-wiring.
- Per-Output Relay Failsafe/Failsecure Configuration: Each of the 4 relay outputs can be independently set to FAI, failsafe, or failsecure mode via jumpers. This is invaluable when you have mixed security postures—office corridor doors (failsafe on power loss) but server room or cash cage doors (failsecure on power loss) on the same supply. Reconfiguring a single jumper beats coordinating with a panel programmer.
- Segregated Auxiliary Bus (Bus1/Bus2): The 8 auxiliary outputs split into two independent groups, each with independent fuse protection and voltage assignment. Real-world benefit: you can put noisy high-current solenoid drivers on Bus1 and sensitive reader/sensor pull-ups on Bus2, isolating RF or inductive noise from your door sensors and reader signaling.
- Class 2 Power-Limited Compliance: Saves significant installation labor on older buildings where conduit separation and NEC compliance become a headache. A Class 2 supply sidesteps those routing requirements entirely—you can bundle it with low-voltage signal cabling without special conduit or physical separation.
- Modular 3A Fuses Per Output: Each relay and each auxiliary output has its own 3A fuse. Benefit: a short on one lock or device doesn't cascade to adjacent outputs. We've seen jobs where a single shorted mag-lock solenoid killed an entire unprotected supply chain; this architecture is bulletproof against that failure mode.
Deployment Considerations:
- This supply is hardwired relay logic—there is no network or API. If your architecture requires ONVIF door status feedback or cloud-based access logs, you need an access control panel upstream of this supply. The FPO75 is a power + relay distribution layer, not a smart controller.
- The 75W budget is finite. A single 24V/3A circuit supports a mag-lock + reader + exit device solenoid, but not a mag-lock + heavy electric strike on the same primary output. Know your per-door current draw (typical mag-locks draw 0.8–1.5A; electric strikes draw 1–2A continuous); if you're stacking two high-current devices on one primary output, you'll exceed 3A and need a second supply or load-shedding logic.
- Failsafe relay mode draws holding current continuously. If you spec failsafe on four 3A mag-locks simultaneously, you're at or above the 12A capability of the primary output. Stagger your failsafe locks or use the 5–18V secondary output for lower-current failsafe solenoids (like electric strike release).
- The secondary 5–18V output is adjustable but not actively monitored on-board. If you dial it to 18V for a high-current auxiliary device and that device overdraws, there's no brownout alert or automatic shutdown—you rely on the 4A fuse. Test secondary voltage and load current before field deployment.
- Jumper configuration changes require panel access and a power cycle. Unlike networked controllers, you cannot reprogram failsafe/failsecure modes remotely. Site teams must have documented jump settings and be trained on physical access to the supply.
This supply is ideal for owner-operators or small facilities management teams who want reliable multi-door access without the cost and operational overhead of a full IP controller. It's also a solid fallback supply for high-availability sites where a controller failure means you need a hardwired failsafe relay layer to keep critical doors operational. Explore the complete Lifesafety Power catalog for larger capacity units and networked variants.
