Mean Well Switching Power Supply - 5VDC, 20A

This is a 100W single output switching power supply from Mean Well. This power supply is extremely reliable and able to output 5VDC at 20A. We've been testing this power supply for quite some time and can definitely attest to its durability with its metal casing, short circuit, overload, and overvoltage protections.

Inside the metal case that surrounds the power supply you will find a selector switch to change the voltage range between 85VAC to 132VAC and 176VAC to 264VAC, or 248VDC to 373VDC. This specific model is cooled by free air convection and operates at a temperature of -20°C to +60°C. Mean Well has really outdone themselves with their power supplies, which are high quality and should last for quite some time without issue!

  • Output Voltage: 5VDC
  • Output Current Range: 0--20A
  • Output Rated Power: 100W
  • Input Voltage Range: 85--132VAC/176--264VAC selected by switch, 248--373VDC
  • Protections: short circuit, overload, overvoltage
  • Cooling by free air convection
  • LED indicator for power on
  • 100% full load burn-in test

Mean Well Switching Power Supply - 5VDC, 20A Product Help and Resources

How to Power a Project

February 7, 2013

A tutorial to help figure out the power requirements of your project.

Core Skill: DIY

Whether it's for assembling a kit, hacking an enclosure, or creating your own parts; the DIY skill is all about knowing how to use tools and the techniques associated with them.


Skill Level: Noob - Basic assembly is required. You may need to provide your own basic tools like a screwdriver, hammer or scissors. Power tools or custom parts are not required. Instructions will be included and easy to follow. Sewing may be required, but only with included patterns.
See all skill levels

Core Skill: Electrical Prototyping

If it requires power, you need to know how much, what all the pins do, and how to hook it up. You may need to reference datasheets, schematics, and know the ins and outs of electronics.

3 Electrical Prototyping

Skill Level: Competent - You will be required to reference a datasheet or schematic to know how to use a component. Your knowledge of a datasheet will only require basic features like power requirements, pinouts, or communications type. Also, you may need a power supply that?s greater than 12V or more than 1A worth of current.
See all skill levels


Looking for answers to technical questions?

We welcome your comments and suggestions below. However, if you are looking for solutions to technical questions please see our Technical Assistance page.

  • I've used this power supply and it has issues at low loads. It is impossible to adjust the voltage down below 5.6 volts under low loads. I've had better luck with the MeanWell RS-15-5, which you can adjust down below 5.2 volts under low loads, and is is a fairly constant voltage power supply all the way up to it's rated load. It's only a 3 amp supply though, but it was perfect for my application.

  • alohawild / about 7 years ago / 1

    I would rather have 7 volts as the regulators often drop the power too much on my projects. I find 5V hard to use. Thoughts?

    • Sembazuru / about 7 years ago * / 3

      The 5V supply is very well regulated so you should be able to bypass any 5V regulators on your project with this supply. (For example, use the 5V pin on an arduino instead of the DC jack.)

      The spec power efficiency of the 5V supply is 80%, much better than a linear regulator.

    • alohawild / about 7 years ago / 1

      Or maybe just nine as that is more standard level.

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