Power Supply PSMU-350-3 DIN-Rail Mountable Switching Power Supply

Description

1. Key Features & Functions

• Wide 3-Phase Input Range:​ Typically accepts 340-550V AC, 3-phase + Neutral​ (or a similar wide range), making it suitable for global industrial voltage standards without manual tapping.
• Regulated 24V DC Output:​ Provides a single, well-regulated 24V DC output at up to ~14.6A (350W / 24V ≈ 14.6A).
• High Efficiency:​ Modern switching designs offer high efficiency (>90%), reducing heat generation and energy costs.
• Active Power Factor Correction (PFC):​ Standard on units of this class to meet harmonic current emission standards (e.g., IEC 61000-3-2) and improve utilization of the supply network.
• Robust Protection:
  • Output:​ Overload, overvoltage, and short-circuit protection.
  • Input:​ Surge and overvoltage protection.
• Status Indication:​ LEDs for power (AC input present) and output status (DC OK).
• Cooling:​ Typically convection-cooled​ (fanless) for reliability, relying on a metal housing and heatsink design.
• Mounting:​ Standard DIN-rail (TS35/7.5 or 15)​ mounting for easy installation in control panels.

2. Common Technical Specifications (Generalized)

• Input Voltage:​ 3 AC 340-550V​ (or 380-480V), 45-65 Hz.
• Output:
  • Voltage:​ 24 V DC (adjustable within a small range, e.g., 24-28V).
  • Current:​ 14.6 A​ continuous at 40°C.
  • Power:​ 350 W​ continuous.
• Efficiency:​ Typically >92%.
• Power Factor (PF):​ >0.95 (with active PFC).
• Protection Class:​ IP20 (for mounting inside an enclosure).
• Operating Temperature:​ 0 to +60°C (or +70°C) with derating above 40-50°C.
• Safety & EMC Standards:​ Compliant with UL 508, IEC/EN 62368-1, IEC/EN 61000-6-2, IEC/EN 61000-6-4.

3. System Integration & Design Considerations

• Upstream Protection:​ Requires appropriately rated 3-phase circuit breaker or fuse​ on the input side.
• Downstream Distribution:​ The 24V DC output is typically connected to a DC distribution block​ or a fuse/terminal block assembly​ to branch power to various loads (PLCs, I/O cards, sensors, actuators).
• Parallel Operation:​ Some models support redundant or current-sharing parallel operation​ using a dedicated interface cable to increase system availability or total current capacity.
• Derating:​ Always check the derating curve in the manual. Output current capacity decreases as ambient temperature increases. At 60°C, it may only deliver 60-70% of its rated current.
• Load Calculation:​ Ensure the total connected load (including inrush currents of solenoids and contactors) does not exceed the power supply’s rated capacity, accounting for derating.

4. Typical Applications

• Industrial Control Panels:​ Primary power source for PLC systems, motor starters, HMI panels, and network equipment.
• Factory Automation Lines:​ Powering distributed I/O stations, robotic controllers, and vision systems.
• Process Control Systems:​ Supplying power to valve positioners, transmitters, and process controllers.
• Packaging & Material Handling Machinery.