The Best 12V 40A Power Supply of 2022 – Reviewed and Top Rated

After hours researching and comparing all models on the market, we find out the Best 12V 40A Power Supply of 2022. Check our ranking below.

2,136 Reviews Scanned

Rank No. #1

REALSUN 12V 40A Universal Switching Power Converter Adapter Transformer Regulated Supply AC to DC LED Driver 480w for CCTV, Radio, Computer Project, 215mm * 115mm *50mm

The Model of LED Driver:Input Voltage: AC110V/220V, Output Voltage:DC 12V, Output Current: 0~40A
Wide Range of LED Power Supply: Widely used in Industrial automation, LED display, CCTV, Radio, Computer Project, LED Strip Lights, 3D Printer etc.
It comes with built-in cooling fan and many holes on the metal case, which makes heat dissipation more efficient.and high efficiency, high reliability and stable performance.
Protection Function: over load protection, over voltage protection, short circuit protection, this protection will protect your load well. NOTE: before using, please select the input voltage according to your local voltage, to avoid damaging.
Service: If you have any problem of our product, you can contact us. we would be delighted to help you and reply you as soon as we can.

SaleRank No. #2

DC 12V 50A 600W Power Supply Adapter Transformer Switch AC 110V / 220V to DC 12V 20amp Switching Converter LED Driver for LED Strip Light CCTV Camera Security System Radio,Computer Project,3D Printer

Switch Power Supply Convert AC 110V/220V to DC 12V 50A 600W: The default input voltage is 110V, Output voltage is adjustable 10% , Metal case with many holes makes heat dissipation more efficient.
AC 110V/220V Input Voltage: We have already adjusted the switcher to 110V/115V for our US customers, if you want to use AC220V,don't forget to adjust the switch to the 220V side before use.★AC 110V/220V.Wide voltage input adjusted automatically to SMPS Model (12V 1A-5A, 12W-60W). As for Model (12V 10A-60A 120W-600W), there is a voltage selector switch located on the side of the switcher is used to set the input voltage to the power supply to either 110V/115V or 220V/230V.
High Efficiency and Reliability: Smart device surge protection for Short-circuit Protection, Overload Protection, Over Voltage, Over Temperature Protection. Low Temperature Rise.★Voltage consistency:There is no voltage fluctuations to speak of at power on, during transmit, receive, or at power off.★Built-in EMI filter, low output ripple, noise, Rugged heavy duty enclosure, 100% Full load burn-in Tested. Parallel/Redundancy Operation is possible.
Widely used in: Wide input voltage range, steady and precise output voltage.Great power transformer for Led Lighting and CCTV Camera Security System, communications & home appliance electronic equipment etc.
After-Sales Guarantee: Enjoy a 30-day refund policy and a 2-year warranty. We strive to provide an exceptional shopping experience for our customers. If you have any questions about our product, our support team is available 24/7 to assist you.

Rank No. #3

DIGISHUO DC 12V 40A 480W Power Supply Adapter Transformer Switch AC 110V/220V to DC 12V 40Amp Switching Converter LED Driver for LED Strip Light | CCTV| Camera Security System| 3D Printer

[12V 40A Power Supply] Input: AC 110V/220V 50/60Hz Output:DC 12V Max 40A 480W. Two output ports. Each port outputs 0~40A automatically to match your device, 40A max in total for 2 ports. The default output voltage is 12V, but it can be regulated by 5%, from 11.9V to 12.1V
[Supply less than 40A such as 1A,5A,10A,20A,30A] For example, if your device draws 7.5A, then 7.5A will be supplied. If draws more than 10A, only 10A will be supplied and power supply will be damaged soon. NEVER OVERLOAD
[Widely Application]Great for LED Strips,3D Printer,ham radio transceiver,CCTV cameras,car subwoofer amp,audio amplifier,wireless router,ADSL Cats,HUB,audio/ video power supply etc
[Protection]Shortage Protection, Overload Protection, Over Voltage Protection
[Metal Case Protection]Maximum protection but IN-DOOR USE ONLY!

Rank No. #4

BOSYTRO 12V DC Power Supply 480W 40A AC to DC Converter Switching Power Supply for Led Strip, Motor Pump, CCTV, 3D Printer, Electronic Instruments, Lab Computer

【Upgrade ac to dc converter】Compared with the old power supply, we have retained 3 sets of output channels, but upgraded the input channels. The old power supply needs to be connected to the input through wiring. We have upgraded the input method, greatly improving the connection efficiency. In addition, we have added a safety switch, which can more conveniently start or turn off the power supply. On the other hand, the safety switch can also be used to quickly determine whether the power supply is normal
【12 Volt Power Supply】Input voltage 110v-240v ac, output voltage 12v dc, adjustable range: ±10%; Output current Mainly depends on your decive, such as DC 10A/120W, 20A/240W, 40A/480W, max current up to 40A, max output power 480W, For more efficient and secure use, recommended for equipment below 384w
【Intelligent Cooling System】The 12v 480w power supply with aluminum alloy shell and designed with multiple holes for better heat dissipation, Built-in intelligent Cooling Fan to prevent overheating and burning of circuit boards, when the working temperature is more than 122℉(45℃), the power supply will automatically run to dissipate【Intelligent Cooling System】The 12v 480w power supply with aluminum alloy shell and designed with multiple holes for better heat dissipation, Built-in intelligent Cooling Fan to prevent overheating and burning of circuit boards, when the working temperature is more than 122℉(45℃), the power supply will automatically run to dissipate
【Multiple Protection】BOSYTRO switching power supply features a overload protection, over-current protection, over-temperature protection, short circuit protection which can protect your device from damage. Safe and stable working, suitable for newer and experienced electrician
【Wide Application】This 12v power supply widely used in industrial equipment, RV, radio/car stereos, led strip, cctv, computer project, 3d printer, motor pump(for Motor device, the peak power of the SMPS needs to be more than 2 times the power of the Motor), security camera, lcd monitor, lab computer and more 12 volt device

SaleRank No. #5

Henxlco AC 110V/220V to DC 12V 40A 480W Universal Regulated Switching Power Supply Adapter Transformer Driver Converter for LED Strip Light, CCTV Security Camera System, Computer Project, black

Dual input voltage: AC 110V/220V. Output: DC 12V 40A max, Output voltage is adjustable ±15%. IN-DOOR USE ONLY!
Two sets of output Channel. With two independent output channels, it can power more devices. The maximum output of each channel can reach 40A 480W. Total output power of the two channels is 40A 480W.
Works with device that draws less than 40A, such as DC 12V 1A~30A. The max use of power should be no more than 80% of the full loads 32A 384W.
Over Voltage Protection, Overload Protection，Over Current Protection, Over Temperature Protection， Short Circuit Protection
High quality Widely used in Industrial automation, electronic equipment, LED display, LED Lighting, LED Strip, CCTV cameras Security System, Computer Project, home appliance etc.

SaleRank No. #6

EAGWELL AC to DC Converter 12V Power Supply,Universal SMPS 120V AC to 12V 50A 600W DC Converter Power Supply Transformer Driver Adapter for RV,Pump,LED Strip, LCD Monitor

Dual Voltage Input + Auto-Adjust Power Smartness .Supports Input voltage: AC 110V / 220V (85-145V / 185-265V); Output current depends on the device, e.g.DC 12V 10A 120W, 20A 240W, 35A 420W, and the peak current is 50A, peak power 600W. Recommended for equipment below 40A 480W. For resistive device, SMPS peak power ≥ device power × 1.25 times. For Motor device, the peak power of the SMPS needs to be more than 2 times the power of the Motor
One Key Operate .Eagwell ac to dc converter built-in Wire Integrated Design,You can clamp directly the "+" and "- "rod with battery clips, It is US patent. This 12v power supply with on/off switch , more safe and convenient power start/stop operation
Plug-and-Play Setup with All-Inclusive Kit .Eagwell ac to dc Converter Includes UL-listed power cord, 12v power supply 600w, cigarette lighter socket, wire lugs, metal clips, and screws—everything you need for clamp-style device connections. Dual wiring options (direct wire + terminal clamps) fit DIY projects, RVs, or industrial setups. No extra tools required
Built-In Smart Cooling System .This 110V to 12V Converter Aluminum alloy shell with integrated heat-dissipation holes + dust-proof fan net. Fan kicks in automatically when temps rise, keeping the converter cool under load—extends lifespan and prevents burnout. No noisy overheating like generic models
5-Layer Safety Protection .Eagwell 12V 50A 600W Power Supply Converter Overload, overvoltage, short circuit, overheat, and leakage protection—built into the heavy-duty copper-nickel terminals. Built-in EMI filter reduces interference for clean power.UL, CE, RoHS certified for worry-free use. Ideal for sensitive equipment (CCTV, medical devices) and harsh environments (boats, workshops)

Rank No. #7

MEISHILE 12V 50A 600W DC Switching Power Supply Adapter PSU AC to DC Industrial Transformer Converter for LED Drive Light Lamp Meter 3D Printer Semiconductor Pump Motor Drive 220V 110V to 12Volt

Universal input voltage: AC 110V/220V, Output 12V, Rated power 50A 600W, Portable, Small, Compact:21.5×11.5×5cm/8.5×4.5×2 inch, weight 0.75 kg SAFETY: Use must derating: max load cannot exceed 80%
PSU(SMPS) convert AC to DC, output current depends on the requirements of the power consuming equipment, Power multiple devices with different Currents/ Watts
Used for DC 12V oxygen/water Pump-semiconductor drive-Atomizer-Winch-Car Jack-Car Stereos-Amplifier-Radios-Air Compressor-LED Light Strip-CCTV Security Camera-Brushless type motor drive (non-variable speed)-Household Appliances-Electronic Devices-Automation Equipment-Computer Project-Servos-City street light sand table toy model drive, etc
PROPRIETARY Circuit solutions: High EFC, Low-loss, Long Service Life: More than 6,000 hours of service life; Aluminum shell, Low standby power consumption, High efficiency
SAFE STABLE: Power Supply has over/under voltage, over heat protection, Strictly tested before leaving the factory

Rank No. #8

DC 12V 50A 600W Switching Power Supply Adapter 110V AC to 12V DC Converter Power Supply Transformer PSU for 12Volt Motor Pump LCD Monitor CCTV Security Camera Car Stereo 3D Printer and More 12V Device

12V Power Supplyr: Input AC 110V/220V, Output 12V, Rated power 50A 600W, PSU(SMPS) convert AC to DC, output current depends on the requirements of the power consuming equipment, Power multiple devices with different Currents/ Watts
Intelligent Cooling: 12V 600W power converter with aluminum alloy shell, built-in cooling fan, metal shell with multiple holes for more efficient cooling, more stable work, high efficiency
【USED WIDELY】DC 12V Power Supply for industrial automation equipment, radio,Amplifier,Radios,LED drive, CCTV Camera System, 3D Printer, Car Stereos, water Pump and more 12V Device. NOTE:Not suitable for charging Battery,Speed Control Motors.
Safe stable: long service life, power supply with over/under voltage, overheating protection,Compact:21.5×11.5×5cm/8.5×4.5×2 inch, weight 0.75 kg
Note: SMPS peak power is 50A 600W, avoid overload, For resistive equipment, Recommended for equipment under 40A 480W. For motor equipment, the starting current will be much higher than the rated power and the peak power of the SMPS needs to exceed 2 times the motor power.

Rank No. #9

EXENWING 12V 40A丨480W Power Supply Adapter AC to DC Universal Converter 110/220V to 12Volt Regulated Switching Transformer PSU for LED Strip Light 3D Printer Car Stereo CCTV Camera Diesel Heater

【AC TO DC CONVERTER 12V POWER SUPPLY】-Input: AC 110/220V 50 / 60Hz; Output: Default DC 12V,Adjustable range: ±10%,form 10.8V-13.2V, which greatly expand its application range. Maximum 40A 480watt power.Please select a power supply at least 20% larger than your device's rated power,good for safety.Three sets of output channels available,it can power more devices. Net weight: 1.65 lbs. Dimension: 8.46 X 4.52 X 1.96 inch
【Good Heat Dissipation】-This AC to DC universal power supply transformer 110V to 12V is made of metal material with many holes,which makes heat dissipation more effictive and ensures stability.Built-in cooling fan will keep running all the time with a little noise once it is powered to protect the converter against overheating.🔺Non-waterproof, In-Door Use Only!
【Switchable Dual Input Regulated Voltage Converter】-There is a voltage switch located on the side of the convetert,our factory setting for US customers is 110V.If you want to use AC 220V,please don't forget to adjust the switch to the 230V(220V) side before use to avoid damaging.AC 110V/220V is just according to your local voltage.
【SAFETY PERFORMANCE】-100% full load burn-in tested,guaranteed security. With smart chips provide automatic overload cut-off / over Voltage cut-off / automatic thermal cut-off / short circuit protection.protect your electronic products from destruction.There is no voltage fluctuations at power on, during transmit, receive, or at power off.Built-in EMI filter, low output ripple.
【HOW TO CHOOSE？】This unit convert AC mains power to DC 12Volt,peak power is 40A 480watts, work perfectly with most 12V devices under 600W, such as LED strips light,3D printer, diesel heater,ham radio,etc. It will automatically outputs 0~40A current to match your device, the actual current is depended on the load,such as 10A(120W), 20A(240W), 30A(360W)....Make sure your device match the 12V voltage and current less than 40Amper.Please DON'T run it overload.

SaleRank No. #10

DROK 12V Power Supply, AC 110V 220V to DC 0-12V 40A 480W Buck Converter, Adjustable Variable LED Adapter Regulated 5V 6V 9V 12Volt Voltage Transformer 10A 20A 30A 40Amp Charger for Lab CCTV

【Volt Adjustment】 Input Voltage can be 110V or 220V. Wide adjustable output Voltage range: DC 0-12V. This supply is suitable for 3V 5V 6V 9V 12Vdevices. The voltage precision is 0.1V. Note——The maximum current is 40A. But the actual current is depended on the load. No matter how many voltage is adjusted, the current is 40A and can not be regulated. It can be used to device of 5A 10A 20A 40A. Make sure to use the devices which is below 40A.
【Hareware】 This Buck Converter is equipped with LED screen, heat sink and cooling fan. The LED screen can clearly display the output voltage. Heat sink and cooling fan can control the temperature in a safe range. During the running power is high, the cooling fan will automatically activate with little noise.
【Easy Operation】 This supply is no need to install, after connecting wire, it can be used to adjust output, which is convenient. The potentiometer is inset into the supply. Only to rotate the potentiometer can adjust output parameter.
【Protection】 Over Load Protection, Over Voltage Protection, Short Circuit Protection, which can protect your device from damage. Note: the default input voltage is 220V, before using, please switching the input voltage to 110V/220V according to your city voltage.
【Wide Application】 This power supply has variable application. It can be used as a 2V 3V 5V 6V 12V 40Apower supply for RV, Car, Labtop, Computer, Lab, CCTV, etc. All of our item has 1 year long time warranty guarantee.

Last update on 2025-03-13 / Affiliate links / Images from Amazon Product Advertising API

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FAQ:

Q: What is a 40A power supply used for?

A: The 40A DC Power Supply provides a wide input voltage range (9-32V) and optional voltage output for higher efficiency and improved functionality. Without a fan, the noise level is reduced and enables the unit to power hi-tech radio systems without interference.

Q: What is a dps1240 power supply?

A: The REDARC DPS1240 is a 12V, 40A DC Power Supply that provides regulated power for sensitive load requirements, including lamps, radios, communications equipment, pumps, TVs, and more from a 12V automotive power system.

Q: Which power supply should I choose for my control box?

A: Power supplies with basic functionality are the perfect solution for compact control boxes. With their flat design, the STEP POWER power supplies are particularly suitable for use in distribution boards. Additional adapters are available for the power supply units, as well as extra fans and electronic fuses.

Q: Why choose trio power power supplies?

A: In the power range below 100 W, even the smallest QUINT POWER power supplies combine preventive function monitoring and a powerful power reserve to deliver superior system availability. The TRIO POWER power supplies combine standard functionality with high quality and reliability, making them ideal for use in machine building.