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The Emerson FOXBORO P0904AK is a rugged 90W DIN-rail power supply engineered for Emerson’s I/A Series distributed control systems and industrial automation applications. Designed as the predecessor to the IPM2 series, this convection-cooled unit delivers highly stable 24VDC power to critical field devices and control modules under demanding conditions. The FOXBORO P0904AK features universal 85–264VAC input with active PFC (power factor correction), achieving >90% efficiency while minimizing harmonic distortion. Its reinforced isolation (1500VAC input-output) and built-in surge protection (4kV/3kA) safeguard sensitive electronics from grid anomalies.
Optimized for space-constrained panels, the Emerson FOXBORO P0904AK operates across -25°C to +70°C ambient without derating, using aluminum fin heat dissipation instead of fans for silent operation. The module supports parallel operation for N+1 redundancy when paired with FOXBORO’s redundancy controller. With comprehensive certifications for industrial environments, the P0904AK ensures uninterrupted power for safety interlocks, analog I/O cards, and HART field devices in continuous process operations.
FOXBORO P0904AK
Technical Specifications
| Parameter Name | Parameter Value |
| Product Model | P0904AK |
| Manufacturer | Emerson (FOXBORO) |
| Product Type | DIN-Rail Power Supply |
| Output Rating | 24VDC ±1%, 90W (3.75A max) |
| Input Voltage | 85–264VAC / 120–370VDC (auto-ranging) |
| Power Factor | >0.95 at full load |
| Efficiency | 91% typical |
| Ripple Noise | <150mVpp> |
| Isolation | 1500VAC input-output |
| Protections | Overvoltage (135–150%), short-circuit, overtemperature |
| Operating Temp | -25°C to +70°C |
| Cooling | Convection (fanless) |
| MTBF | 300,000 hrs @ 40°C |
| Certifications | UL 508/61010, CE, EN 50155 |
| Connection | Removable screw terminals |
Main Features and Advantages
Robust Power Conditioning: Active PFC circuitry maintains >0.95 power factor even at 115VAC input, reducing harmonic currents. The P0904AK withstands 300ms power dips and delivers 150% peak current (5s) for solenoid actuation.
Extreme Environment Resilience: Aluminum casing with IP20 protection resists dust ingress. Operates at 70°C ambient without derating – critical for electrical rooms lacking climate control. Withstands 5g vibration per IEC 60068-2-6.
Simplified Integration: DIN-rail mounting (TS35/7.5/15) enables tool-free installation. Redundancy diode built into output circuit allows parallel operation without external components. Transparent cover protects terminals while permitting visual inspection.
Enhanced Safety: Reinforced isolation meets EN 50178 standards for industrial control panels. Output floating design eliminates ground loops. Short-circuit protection features auto-recovery upon fault clearance.
Application Field
The Emerson FOXBORO P0904AK powers mission-critical automation across heavy industries. In chemical processing plants, it energizes reactor temperature control loops and agitator VFDs. Oil refineries deploy it for turbine vibration monitoring systems and desalter electrode controls. Power generation facilities rely on its surge immunity for governor controls and exciter fields.
Water/wastewater treatment plants utilize the P0904AK for SCADA RTUs and chlorine analyzer cabinets. In pharmaceutical manufacturing, it maintains cleanroom HVAC damper controls during voltage sags. The module’s railway certification (EN 50155) makes it suitable for rolling stock applications like traction battery monitoring.
FOXBORO P0904AK
Related Products
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P0604AK: 60W variant for low-power applications.
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FBM207: Digital output module requiring 24VDC power.
CPSU-400: Chassis power supply for FBM backplanes.
P0924: 24VDC/100W power supply with active cooling.
FPM1000: Power management controller for redundancy.
