Model Number P0903ZN Product Line Foxboro I/A Series Module Type Power Supply Module (PSU) Key Function Provides regulated DC power to all other modules (CPs, FBMs, IDPs, etc.) in an I/A Series rack. Input Specifications Input Voltage 85 - 264 VAC (Universal input, compatible with standard 120VAC and 240VAC networks). The "N" in the model code typically denotes AC input. Input Frequency 47 - 63 Hz (Compatible with both 50Hz and 60Hz power grids). Inrush Current Limit Yes, to prevent tripping circuit breakers during power-up. Output Specifications Output Voltages Provides the standard DC voltages required by the I/A Series backplane: • +5 VDC (for digital logic circuits) • ±15 VDC and/or +24 VDC (for analog circuits and field I/O power) Total Output Power Approximately 300 Watts (The "03" in the model code often indicates this power level). The exact rating must be verified. Efficiency Typically > 80%. Protections Overload (current limit), over-voltage, and over-temperature protection. Physical & Environmental Mounting Installs into a dedicated slot in a Foxboro PSS (Power Supply System) rack. Hot-Swappable Yes. In a redundant configuration, it can be replaced without powering down the entire system. Operating Temperature 0°C to +60°C (standard industrial range). Status Indicators (LEDs) Includes LED indicators for Power Good (PWR OK), Fault (FAIL), and Load Sharing status. Safety & Compliance Safety Standards Complies with UL, cUL, CE, and other international safety standards. EMC Immunity Designed to meet electromagnetic compatibility requirements for industrial environments.

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