PSU4 Universal 12V Power Supply

About the Product

The BLOCKsignalling PSU4 is a compact, universal-input power supply module designed to provide stable and reliable 12V DC outputs for model railway electronics where only a single AC or DC power source is available. Ideal for powering controllers, signals, accessories, and layout electronics, the PSU4 simplifies power distribution while ensuring consistent performance.

The module automatically adapts to a wide range of input voltages, accepting 5–25V DC or 9–16V AC without the need for configuration or polarity checking. Input power can be connected via screw terminals or a standard 2.1mm barrel jack, making the PSU4 equally suitable for hard-wired installations or plug-top power supplies.

All outputs are protected by an on-board 1A self-resetting thermal fuse, providing automatic protection against short circuits and overloads. In the event of a fault, power is safely disconnected and then restored once the fault is cleared and the fuse has cooled. A built-in LED provides clear visual indication of output status and fault conditions.

Designed for flexibility, safety, and ease of use, the PSU4 is an ideal power solution for both small and complex layouts.

Key Features

• Universal input accepts 5–25V DC or 9–16V AC automatically
  
• Provides multiple stable 12V DC outputs from a single supply
  
• Not sensitive to input polarity — no risk of reverse wiring
  
• Screw terminal input and 2.1mm barrel jack for flexible power connection
  
• Factory-set 12V DC output with high stability (typically ±2%)
  
• 1A total output current across all outputs
  
• On-board self-resetting thermal fuse for overload and short-circuit protection
  
• Automatic power restoration once a fault is cleared
  
• Integrated LED status indicator for normal operation and fault conditions
  
• Compact module ideal for control panels and under-layout mounting

Compatibility Information

• Suitable for powering 12V DC model railway electronics and accessories
  
• Compatible with both AC and DC external power supplies
  
• Requires no configuration or adjustment for different input voltages
  
• Maximum output current: 1A total (shared across all outputs)

Documentation & Support

For detailed installation guidance, wiring diagrams, and troubleshooting advice, please download the latest instruction manual:

User Instruction Manual