The Maxcom 12V 40A 480W Industrial Switch Mode Power Supply (SMPS Metal Casing) is a high-capacity, regulated DC power supply engineered for continuous heavy-duty power delivery in industrial automation, LED lighting arrays, 3D printing farms, and high-power electronics projects. Operating across a wide switch-selectable AC mains input (110V/220V AC), it delivers a stable, low-ripple 12V DC output with continuous current capability up to 40A (480W total power). Housed in an extruded, perforated honeycomb aluminum chassis equipped with an integrated high-efficiency active cooling fan, it features built-in multi-stage protection circuitry against overloads, overvoltage, short circuits, and thermal runaway. The Maxcom 12V 40A SMPS is widely utilized in large-scale LED strip installations, CCTV central security systems, 3D printers and CNC machines, automotive 12V test benches, thermoelectric Peltier cooling rigs, and multi-channel DC motor drivers.

Specifications

• Brand / Series: Maxcom Industrial High-Power Switching Power Supply
• Power Supply Type: Enclosed Constant-Voltage Switch-Mode Power Supply (SMPS)
• Rated DC Output Voltage: 12.0 V DC (Nominal)
• Output Voltage Adjustable Range: 10.8 V to 13.2 V DC (±10% via onboard trimpot)
• Rated Output Current: 40.0 A Max. (Continuous output capability)
• Rated Output Power: 480 W Max.
• AC Input Voltage Range: 100V–120V AC / 200V–240V AC (Selectable via side slide switch, 50/60 Hz)
• Output Voltage Ripple & Noise: ≤ 120 mVp-p
• Line Regulation: ± 0.5%
• Load Regulation: ± 1.0%
• Efficiency: ≥ 82% to 85% (at full rated load)
• Cooling Method: Forced Air Cooling via Built-in DC Brushless Exhaust Fan (Auto-thermal / Continuous operation)
• Housing / Chassis Material: Heavy-Duty Perforated Aluminum Honeycomb Enclosure (Corrosion & oxidation resistant)
• Terminal Block Interface: 9-Terminal Heavy-Duty Barrier Screw Strip with Clear Protective Cover:
  • Terminals 1, 2, 3: DC Output Negative (-V / -V / -V / Common GND)
  • Terminals 4, 5, 6: DC Output Positive (+V / +V / +V / +12V DC Rail)
  • Terminal 7: Earth Ground (⏚ / FG - Frame Ground)
  • Terminal 8: AC Neutral (N)
  • Terminal 9: AC Line / Live (L)
• Voltage Trimmer: Integrated ADJ precision potentiometer adjacent to terminal block
• Built-in Protections:
  • Short-Circuit Protection (Hiccup mode, automatic recovery after fault clearance)
  • Overload Protection (105% to 150% rated load current foldback/shut-off)
  • Overvoltage Protection (13.8V to 15.0V clamping / shut-down)
  • Over-Temperature Thermal Shut-Off Protection
• Dielectric Withstand Voltage (Hi-pot): 1500V AC (Input to Output, 1 min)
• Insulation Resistance: ≥ 100 MΩ (at 500V DC)
• Operating Ambient Temperature: -10°C to +60°C (Derate output power above 50°C)
• Storage Temperature: -20°C to +85°C
• Dimensions: Approx. 215 mm × 115 mm × 50 mm (L × W × H)
• Net Weight: Approx. 750 g to 850 g

Features

• High 40A / 480W Power Output: Easily powers multiple high-draw DC loads, large LED installations, or high-torque stepper/servo arrays from a single unified supply.
• Active Forced-Air Cooling: Integrated exhaust fan and ventilated honeycomb aluminum shell efficiently remove heat from internal power MOSFETs, magnetic transformers, and Schottky rectifiers.
• Triple Output Terminals: Three parallel pairs of +V and -V terminals allow multi-branch wiring without overcrowding individual terminal screws.
• Onboard Voltage Fine-Tuning (+V ADJ): Front-accessible potentiometer allows voltage trimming from ~10.8V to ~13.2V to compensate for voltage drops over long wire runs.
• Robust Metal Enclosure: Perforated aluminum chassis provides exceptional mechanical protection, electromagnetic interference (EMI) shielding, and passive convection airflow.
• Comprehensive Protection Architecture: Automatic short-circuit, overload, and thermal safeguards protect both the power supply and connected equipment from catastrophic damage.

Common Applications

• High-Density LED Lighting: Powering extensive runs of 12V SMD 5050 / SMD 2835 / COB LED strips, architectural neon flex, and outdoor billboard lighting.
• 3D Printers & CNC Routers: Supplying high-current power for heated beds (12V MK2B/MK3), hotends, stepper motor drivers, and spindle controllers.
• CCTV & Surveillance Systems: Centralized 12V DC power distribution box for multi-camera installations, PTZ cameras, DVRs, and NVRs.
• Automotive Audio & Bench Testing: Testing 12V car amplifiers, head units, 12V DC winches, horns, and automotive accessories indoors.
• Peltier & Thermoelectric Cooling: Driving heavy current into TEC1-12706 / TEC1-12710 Peltier cooling modules for DIY mini refrigerators and cold plates.
• Robotics & DC Motor Drives: High-current power rails for high-power DC brushed and brushless motor controllers (H-bridges, BTS7960 drivers).

Usage Tips

• Input Voltage Selector Switch (CRITICAL): Before applying AC mains power, check the 110V / 220V selector switch on the side of the metal casing. Ensure it is set to match your local mains voltage (220V/230V or 110V/115V) to prevent permanent internal component failure.
• Earth Grounding for Safety: Always connect the Earth Ground terminal (FG) to a genuine mains earth connection to discharge EMI filter currents and prevent mild capacitive chassis tingling.
• Load Balancing Across Terminals: When drawing currents above 15A–20A, distribute your wiring across the three separate +V and -V screw terminals rather than running the full 40A through a single terminal pair, preventing localized terminal heating.
• Proper Wire Gauge Selection: Use thick, heavy-gauge copper wiring (such as 10 AWG to 12 AWG stranded wire or multi-strand 4.0 mm²–6.0 mm² copper) for the DC output lines to minimize I^2R resistive heating and voltage drops.
• De-rating for Continuous Longevity: For continuous, 24/7 operation (e.g., commercial LED signage or 3D printer farms), design within the 80% rule (approx.32A / 380W continuous draw) to maintain low internal temperatures and extend the lifespan of the filter electrolytic capacitors.
• Airflow Clearance: Mount the unit with at least 50 mm (2 inches)** of unobstructed space around the perforated casing and fan vent to ensure unrestricted cooling airflow.