25A MOSFET module with heatsink

This MOSFET power module is designed to let your 3D printer handle a heated bed (Hot Bed) with higher power demands—supporting currents up to 25A. Most 3D printer mainboards are limited to around 15A, but by using this external module, you can safely drive more powerful beds without overloading your printer's internal electronics.

It supports both 12V and 24V heated beds. For high-current applications, using 24V is recommended, as it draws half the current for the same power output compared to 12V—making it more efficient and reducing cable heating.

This module adds a layer of protection to your printer’s control board while also improving power delivery to the heated bed.

Specifications

• MOSFET Type: High-power N-channel MOSFET
• Max Current Load: Up to 25A (with proper cooling)
• Operating Voltage: 12V / 24V DC
• Control Voltage: 5V (compatible with most 3D printer mainboards)
• Trigger Signal: Low-level active (connects to printer’s heated bed output)
• Voltage Drop: Low RDS(on), minimal heat generation with good cooling
• PCB Size: Approx. 60mm × 50mm
• Connector Type: High-current screw terminals
• Application: Heated bed power expansion for 3D printers

Wiring Diagram