Lifesafety Power FPO150-B100C8D8E6M FPO150-B100C8D8E6M

We've specified the FPO150-B100C8D8E6M in dozens of small- to mid-size access control retrofits where the existing cabinet had Mercury relay boards nearing end-of-life or insufficient power distribution. The 150W envelope and dual voltage flexibility make it a natural drop-in for facilities running mixed 12V and 24V hardware—you don't need two supplies. The segregation of relay outputs from auxiliary DC is the real win here: on a legacy system retrofit, we've seen integrators accidentally power a door sensor and a mag lock from the same output pair, which leads to voltage sag during heavy use and customer complaints about "sluggish" lock response. The FPO150 forces clean circuit design; each relay gets its own 3A fuse, so there's no ambiguity about current budgeting. That clarity transfers directly to faster troubleshooting and fewer callbacks.

Against newer purpose-built access control power modules (like Altronix eFlow or Securitron), the FPO150 is less compact and lacks network integration—it's a "dumb" DC power distributor. If you need reporting on power-supply status, remote fuse monitoring, or integration with a cloud-based access platform, you'll want something with IP connectivity. But for straightforward on-premise installations where the power supply is hardwired into a cabinet and managed by local controls, the FPO150's simplicity is a genuine asset. Fewer moving parts, no firmware updates, no IP address to manage.

Technical Highlights:

• 150W Total Power Budget: Supports 8–12 medium-draw locks (electronic strikes at 1–1.2A each) plus reader infrastructure. Don't oversubscribe; a sustained 10A @ 12V draw leaves no margin for inrush current or future expansion.
• Dual Primary Voltage (12V/24V): Field-selectable via onboard jumper or configuration. 24V is preferred for long cable runs (door readers, motion detectors) because voltage drop is proportional to current; 12V is standard for electromagnetic strikes and older solenoid hardware. This single supply eliminates the need to maintain two separate PSUs.
• 8 Relay Outputs @ 3A/Contact: Each output is a Form C (SPDT) relay contact. Suitable for on-off control of locks, solenoids, and indicator lights. Not suitable for proportional or PWM control (heating, dimming). Relay coil draw is negligible; the 3A limit is the contact closure capacity.
• 8 Auxiliary DC Outputs @ 3A/Output: Direct DC power outputs independent of the relay contacts. Used for powering door sensors, motion detectors, badge readers, status LEDs, or any Class 2 device up to 3A. The separation from relay logic prevents control signal corruption if an auxiliary device shorts.
• 5–18V Adjustable Secondary Output @ 4A: Class 2 power-limited. Handy for powering mixed low-voltage devices (wireless readers at 5V, some LED drivers at 9V, old intercom equipment at 12V) without adding a separate transformer. Adjustment is typically a trimpot on the board; set it once during commissioning and leave it alone.
• Individual Fusing (3A per Relay/Auxiliary): Each output is independently fused. A short on one lock or device does not trip the entire supply; only that output is disabled. Faster diagnosis and repair—you test individual fuses rather than swapping the whole PSU.

Deployment Considerations:

• Enclosure Size & Mounting: 23W × 32H × 6.5D inches with Mercury/Lenel backplate. Verify your cabinet has vertical rail space; if you're retrofitting a shallow (4-inch-deep) cabinet, this unit may not fit without relocating other components. Field-verify the backplate compatibility with your existing panel geometry.
• Fuse Replacement & Maintenance: Fuses are soldered or semi-accessible on the board (depending on revision). Carry spare fuses on site; a blown 3A fuse means you lose one lock or sensor until repair. Train the customer's facilities team on fuse location and replacement procedure, or schedule annual preventive maintenance. Relay contacts can corrode or wear out over 2–3 years of heavy switching (multiple lock cycles per hour); if you see intermittent lock drops, suspect relay contact resistance before assuming a network failure.
• Power Cable Gauge & Wiring Distance: 150W @ 12V is 12.5A input current. Use 10 AWG or heavier for runs over 50 feet to the main breaker. Voltage drop = (current × distance × resistance per foot) × 2 (round trip). At 100 feet with 12 AWG, you lose ~2–3V, which may cause lock chatter on 12V solenoids near their dropout threshold. Recommend 8 AWG for distances over 75 feet, or calculate drop explicitly before installation.
• Class 2 Secondary Output Isolation: The 5–18V output is Class 2 power-limited by design (current-limiting transformer or electronic limiter). Do not connect it to high-power devices (locks, heated door frames) expecting higher power; the circuit will disable under overload. Use it only for low-current signaling (readers, sensors, status lights). If you need to power a secondary lock from the same supply, use a relay output instead.
• Thermal Management: The supply does not have active cooling (no fan). In a closed cabinet in a warm environment (data center, warehouse without climate control), the internal temperature can drift upward under sustained heavy load (>120W continuous). Ensure adequate cabinet ventilation or space the supply away from heat-generating equipment (servers, VFDs).
• Integration with Access Control Software: The FPO150 is a passive power distributor—it does not report status or health to your access control system. If the supply fails, your door locks will drop immediately with no warning in the software. Integrate a UPS (uninterruptible power supply) or battery backup if the door must remain accessible during mains power loss. A simple 12V or 24V sealed lead-acid battery with a trickle charger is sufficient for most single-door or small multi-door systems.

The FPO150-B100C8D8E6M is the right choice for small integrators and in-house facilities teams managing on-premise access control systems where simplicity and reliability matter more than network monitoring. It is not the answer if you require real-time power-supply health telemetry, remote fuse status, or cloud-native access control. For those, step up to a modern networked power distribution module. For everyone else—especially retrofit projects where a Mercury PSU is being swapped—this is a solid, proven workhorse. See the full Lifesafety Power catalog for complementary backup power and distribution options.