How to Use 24v 300w 12.5A PSU: Examples, Pinouts, and Specs

The Reylax DT-NT24V-300W is a high-performance power supply unit (PSU) designed to convert standard AC mains voltage into a stable 24V DC output. With a maximum power output of 300 watts and a current capacity of 12.5 amps, this PSU is ideal for powering a wide range of electronic devices, industrial equipment, and DIY projects. Its robust design ensures reliable operation in demanding environments.

• Powering industrial control systems and automation equipment
• Driving high-power DC motors and actuators
• Supplying power to LED lighting systems
• Providing a stable power source for laboratory and testing equipment
• Supporting DIY electronics projects requiring high current

Below are the key technical details of the Reylax DT-NT24V-300W:

The PSU features screw terminal connections for both input and output. Below is the pin configuration:

1. Mounting the PSU: Secure the PSU in a well-ventilated area to ensure proper cooling. Avoid placing it near heat sources or in enclosed spaces without airflow.
2. Connecting the Input:
   • Connect the L terminal to the live wire of the AC mains.
   • Connect the N terminal to the neutral wire of the AC mains.
   • Connect the GND terminal to the earth/ground wire for safety.
3. Connecting the Output:
   • Connect the +V terminal to the positive input of your load or circuit.
   • Connect the -V terminal to the ground or negative input of your load or circuit.
4. Powering On:
   • Ensure all connections are secure and correct.
   • Switch on the AC mains power to activate the PSU.

• Load Requirements: Ensure the total load does not exceed 300W or 12.5A to prevent overloading the PSU.
• Ventilation: Maintain at least 10cm of clearance around the PSU for proper airflow.
• Wiring: Use appropriately rated wires for both input and output connections to handle the current safely.
• Polarity: Double-check the polarity of the output connections to avoid damaging your devices.
• Safety: Always disconnect the PSU from the mains before making any wiring changes.

The Reylax DT-NT24V-300W can be used to power an Arduino UNO via a DC-DC step-down converter (e.g., a buck converter) to step down the 24V output to 5V. Below is an example setup:

1. Connect the PSU's +V and -V terminals to the input of the DC-DC step-down converter.
2. Adjust the step-down converter to output 5V DC.
3. Connect the 5V output of the converter to the Arduino UNO's 5V and GND pins.

// Example code to blink an LED connected to pin 13 of the Arduino UNO
// Ensure the Arduino is powered via the 5V output of the step-down converter

void setup() {
  pinMode(13, OUTPUT); // Set pin 13 as an output
}

void loop() {
  digitalWrite(13, HIGH); // Turn the LED on
  delay(1000);            // Wait for 1 second
  digitalWrite(13, LOW);  // Turn the LED off
  delay(1000);            // Wait for 1 second
}

1. PSU Does Not Power On:

   • Check the AC mains connection and ensure the input voltage is within the specified range (100-240V AC).
   • Verify that the fuse inside the PSU is not blown.

2. No Output Voltage:

   • Ensure the load is connected properly to the output terminals.
   • Check for any overload or short circuit on the output side.

3. Overheating:

   • Ensure the PSU is not overloaded (maximum 300W or 12.5A).
   • Verify that the cooling fan is operational and the PSU is in a well-ventilated area.

4. Output Voltage Fluctuations:

   • Check for loose connections on the input or output terminals.
   • Ensure the input voltage is stable and within the specified range.

Q1: Can I use this PSU to charge a 24V battery?
A1: No, this PSU is not designed for battery charging as it lacks the necessary current regulation and charging profiles. Use a dedicated battery charger for this purpose.

Q2: Is the PSU suitable for outdoor use?
A2: No, the PSU is not weatherproof. It should only be used in dry, indoor environments.

Q3: Can I connect multiple devices to the PSU?
A3: Yes, as long as the total power consumption does not exceed 300W or 12.5A.

Q4: What happens if the PSU is overloaded?
A4: The PSU has built-in overload protection and will shut down to prevent damage. Reduce the load and restart the PSU.