S-300-12 250W 12V 25A LED Small Switching Power Supply AC 110V/220V5

S-300-12 300W 12V 25A LED Small Switching Power Supply AC 110V/220V To DC12V Transformer
 
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The S-300-12 LED Switching Power Supply is a highly popular AC-to-DC step-down transformer designed to convert high-voltage alternating current (110V/220V AC) into a stable 12V DC output with a maximum current of 25A, delivering a total of 300W of power. It is widely used for powering dense LED strip installations, 3D printers, CCTV security cameras, and various industrial automation hardware. 
 
A variety of verified manufacturers and global trading companies offer this exact power supply model in bulk or sample quantities directly on the Alibaba Platform.
 
Core Specifications & Key Attributes
Model Designation: S-300-12
Total Output Power: 300 Watts
DC Output Voltage: 12V DC (typically features a ±10% adjustable potentiometer screw)
Max Output Current: 25 Amperes
Input Voltage Range: Dual-input functionality via a manual toggle switch (85–132V AC / 170–264V AC)
Safety Protections: Built-in automatic recovery mechanisms shielding against short circuits, overloads, and overvoltage conditions. 
 
Typical Terminal Wiring Connections
When wiring the screw terminal block, ensure the mains power is disconnected and configure according to the marked labels: 
AC Input: Line (L), Neutral (N), and Ground/Earth (\(\triangleq \)).
DC Output: Negative Common (COM / -V) and Positive (+V) lines. 
 
⚠️ Safety Warning: Ensure the mains power is completely disconnected before touching any terminal screws. Always double-check that the manual input voltage switch (110V vs 220V) matches your wall outlet voltage before powering the unit up to avoid immediate component damage.