---
product_id: 339109805
title: "LONGWEI DC Power Supply Variable,30V 10A 4 Digital LED Display Adjustable Regulated Switching Power Supply Digital with Leads Power Cord Used for Spectrophotometer and lab Equipment Repair (Black)"
brand: "longwei"
price: "£58.52"
currency: GBP
in_stock: true
reviews_count: 13
category: "Longwei"
url: https://www.desertcart.co.uk/products/339109805-longwei-dc-power-supply-variable-30v-10a-4-digital-led
store_origin: GB
region: United Kingdom
---

# 30V max output voltage 4-digit LED precision display 10A max output current LONGWEI DC Power Supply Variable,30V 10A 4 Digital LED Display Adjustable Regulated Switching Power Supply Digital with Leads Power Cord Used for Spectrophotometer and lab Equipment Repair (Black)

**Brand:** longwei
**Price:** £58.52
**Availability:** ✅ In Stock

## Summary

> ⚡ Power Precision Meets Lab-Grade Reliability — Own the Voltage, Own the Moment!

## Quick Answers

- **What is this?** LONGWEI DC Power Supply Variable,30V 10A 4 Digital LED Display Adjustable Regulated Switching Power Supply Digital with Leads Power Cord Used for Spectrophotometer and lab Equipment Repair (Black) by longwei
- **How much does it cost?** £58.52 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/339109805-longwei-dc-power-supply-variable-30v-10a-4-digital-led)

## Best For

- longwei enthusiasts

## Why This Product

- Trusted longwei brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Compact Powerhouse:** Sleek, lightweight aluminum chassis (under 2kg) fits effortlessly on any bench or workspace without sacrificing durability or style.
- • **Built to Last & Protect:** Advanced multi-layer safety features including over-voltage, over-current, over-temperature, and power limit protections—engineered for peace of mind.
- • **Ready for Every Challenge:** Complete with premium insulated leads and alligator clips, perfect for lab research, DIY electronics, battery charging, and professional repairs.
- • **Smart Cooling, Silent Power:** Intelligent temperature-controlled fan and heat dissipation grooves keep your device cool and whisper-quiet during intense workloads.
- • **Precision at Your Fingertips:** Ultra-fine 0.01V/0.01A resolution with backlit 4-digit LED display for crystal-clear readings, even in dim labs.

## Overview

The LONGWEI K3010D is a compact, high-precision 30V/10A DC regulated power supply featuring a crisp 4-digit LED display, multi-layer safety protections, and intelligent cooling. Its durable aluminum body and included premium leads make it an essential tool for labs, R&D, and electronics professionals seeking reliable, noise-free power delivery in a sleek footprint.

## Description

Product description LONGWEI K3010D Black Series is an DC regulated bench power supply.The maximum output voltage is up to 30V and the current is up to 10A. Black frosted metal body and more compact size, looks more cool and dirt resistant.And at the same time,we still see quality reliability as the top priority for DC regulated power supply. The series is equiped with a better materials and upgraded structure which makes it higher reliable and accurate, lower ripple and noise.The new circuit design also makes it perform better in over-voltage, over-current, over power, over heat and protection.Its reliability and versatility make it an indispensable and valuable tool for testing, research projects, etc, and the ideal choice for laboratories, research institutes, and R&D organizations. In the Box 1 x DC Power Supply 1 x Output Power Cord 1 x Input Power Cord 1 x Test probes 1 x User Manual Lightweight, Compact and Portable Weight: 3 lb (1.4kg) Size: 8.6 x 2.7 x 6.3 inch The front area is as small as the cell phone This power supply is light and compact enough to save a lot of space for you. The large 4 LED digital display provides more accurate voltage and current readings. Even in the low-light conditions, you also can easily and accurately read value. Easy to Operate Knob with two functions of coarse and fine adjustment, you can adjust the voltage and current data bit by bit, which allows you to set the desired output resolution quickly and easily in 30V 10A. Black frosted metal body and more compact size, looks more cool and dirt resistant. Multiple protection The safety of our customers is our most important thing! K3010DDC power supply can provide a variety of protection, because •Constant current protection •Over temperature protection • Overvoltage protection •Current limit protection Intelligent Cooling Fan Cooling fan will intelligently turn on when the working temperature is more than 122℉/50℃, giving the device longer service life Compared with other competitors, Safety is our priority.We provide a high quality set of jumper or tester lines. Please refer to the main figure for detailed parameters. These are good sturdy leads with nice rubber insulation cover and the alligator clips made of copper.The clips had insulators to reduce the possibility of accidental shorting. Good quality leads that work great for moderate to low current testing. These wire are good for up to 15 amps maximum. They are fine for basic electrical testing for things like automotive accessories, as long as whatever you are testing uses a fuse of 15 amps or smaller.

Review: An EXCELLENT quality (but inexpensive) power supply! - FINAL UPDATE (Hopefully!: I have now been using these 2 supplies for around 4 years and have not had a lick of trouble with either of them. They run very quietly, are very accurate and hold their settings perfectly. I would still recommend swapping out the amperage potentiometer for multi-turn (as long as you are OK with soldering) but it's still a great power supply without it. ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ I really like this power supply. One of the main reasons i bought it was of course its price, but the reason i chose this over the other cheap ones was that, from the reviews i saw on YouTube, the others often seemed to have trouble with the Volt/Amp potentiometers (control knobs). They always seemed to be cheap single-turn ones that failed pretty soon.....and that's why i liked this one, because i knew that the Voltage control pot was multi-turn, and hence was definitely better quality. I am only a real newbie at electronics, but i had learned at least enough to know that. The Voltage pot IS multi-turn and it is easy to get it tuned in very easily. I have seen other guys struggling to tune in the Coarse/Fine pots on other supplies. The Current pot on this one, however, is NOT multi-turn and i wish it was....but it's still smooth and easy to work with. The calibration seems spot-on out of the box, but i know that i can fine tune it if need be from the trimmers inside, so no worries. UPDATE: I just purchased a second one of these and checked it out internally.....it is VERY easy to upgrade the current (amps) control to multi-turn also. I see they are 10K pots (WXD3-13 2W 10K...Google it) and i just purchased ten of these for $13 from Ebay and will be installing one in each of my power supplies' current contol. It's not a big deal but for $1 or so then why not? The other main reason i chose this one was that i saw how the other cheap supplies have the BIG flat heat sink aluminum plate slapped straight across the air flow towards the rear of the case, so all the other components get fried at the expense of the main chip staying cool! That seemed awful design to me. This chip has plenty of cooling (on nice proper finned heat sinks) but so does everything else because the main board is set parallel to the case so gets plenty of air flow. The fan cuts in and out under thermal control, except it does a quick self test upon power-up. The only thing i would wish here is that the speed could also be thermally controlled, but that is nit-picking and i could modify it myself anyway later if needed. The fan does NOT seem unduly noisy when it does come on and is not annoying to me. The voltage actually runs up to 31.9 volts and the current to 11.4 amps, so you get plenty for your money here. For newbies (like me!) to set the current, you have to short out the croc clips while at a low (4 to 7) voltage. After that, upon applying your load, the current will gradually increase as you increase the voltage....until you hit your set current and then it will switch to constant current mode and only the voltage will increase. OK, i will quit teaching the experts how to suck eggs here and leave it at that. In my view, this is an EXCELLENT power supply. The only reason i have taken off one star is because 5 stars would be "perfect" and since that doesn't exist, i have taken one off for the above nit-picky points. There aren't many reviews online of this power supply so i wanted to help correct that. My supply has worked faultlessly since purchase but that has only been a week, although i have tested it pretty rigorously in that time. If anything should change regarding my review, i will make an update here to let people know. I was going to purchase this on Ebay but then noticed it on desertcart for only a couple of dollars more, so i thought it was worth that to get the better "returns" peace of mind because with my Prime membership they will pay the return for me and i can also try it free for a month and, if i don't like it, i can return it for any reason. And no, desertcart don't pay me for this! Lol! UPDATE OK It has now been around 10 months since my purchase (just bought a second one!) and just wanted to say that there has been no change to my assessment. This power supply has been great in use and has never given me a problem. Just for those (like me) that worry that the thing might blow up after a month or two, it has never given any hint of a problem, and some of my usage has fairly put it to the test. OK...that's it. I will update again if this changes, also. UPDATE2 I have now swapped out the current pot in my supply for a 10K multi-turn pot and it is now a SUPERB power supply! It really has made a huge difference for the cost of $1.30 per supply. I highly recommend this modification AND the supply. UPDATE4 (3 was at the beginning) Six years now and counting. This thing is now perfect with no issues at all. I have now updated the stars here to 5 stars....it's perfect.
Review: Would definitely recommend - I've been using this supply daily since I've received it. I've charged sla batteries, used it to test a suspected faulty truck blower motor, charge lithium ion and phosphate batteries, and power a few high power led lights for testing, along with anodizing some titanium parts for fun (large and small). I have to say I'm more than satisfied. The voltage display is adequate, though the voltage is in 0.01 increments (if you're gentle and patient), to overcome the limitations of the display I simply piggy back a trusted digital volt meter no big issue there. Ive observed the voltage is satisfactorily stable all the way up to its 10 amp limit. I believe the unit is actually pretty well overbuilt as well, as I've had no issues drawing the full 10 amps, and a bit more with no overheating issues. The fan is temperature or load responsive and only runs when necessary, so no constant noise, and when it does run its not annoying at all. I haven't opened it up yet to observe the build quality, but only because I've been satisfied and impressed so far. The included test leads are also a surprise, I was fully prepared to build my own to replace them, but once again I've been adequately impressed by them as well. So, all of that to say its a solid little unit for the money and does everything its supposed to, and does it well.

## Features

- 【High Precision with 4-Digit and Power Display】LONGWEI 30V 10A DC benchtop power supply is a professional power supply regulation device that has a high resolution of 0.01V and 0.01A. You can easily tune it within 0-30V and 0-10A. The backlit 4-digit LED display provides a more accurate readout for the voltage and current value, visible easily even in the low-light conditions.
- 【High Quality with Essential Safety】Safety is our priority. Grounding wire, The power supply takes the function of limited flow protection, overpower protection, over temperature protection, voltage overload protection. greatly improving its working efficiency and lifespan!
- 【Excellent Heat Dissipation】Equipped with a big fan controlled by intelligent temperature control sensor and multiple heat radiation grooves on both sides, Intelligent fan offers excellent heat dissipation effect, which reduces the noise and prolongs the life of product effectively.( When the internal power supply reaches a certain temperature, the fan will automatically turn on for heat dissipation)
- 【Compact and Various Application】This one weighs less than 2kgs and measures only 2.7*8.6*6.3inches, Applies for laboratory, school, home, electronic repair DIY, aging test and other requirements thanks to complete test probes and output cable with alligator clips.
- 【What You Get & SERVICE】1 x K3010D DC power supply, 1 x output power cord, 1 x Input power cord, 1 x test probes, 1 x User manual. (Buy Now Risk-Free with 30 days Free Of Return,we provide 12-Month after sale service, lifetime technical support.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B092DCM46L |
| Amperage | 10 Amps |
| Best Sellers Rank | #37,897 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #22 in Lab Power Supplies #39 in Life Science Supplies |
| Brand | LONGWEI |
| Color | Black |
| Connector Type | Barrel Connector |
| Connector Type Used on Cable | Barrel Connector |
| Customer Reviews | 4.4 out of 5 stars 1,141 Reviews |
| Enclosure Material | Aluminum |
| Form Factor | Box-shaped |
| Input Voltage | 240 Volts (AC) |
| Item Dimensions | 8.66 x 2.76 x 6.3 inches |
| Manufacturer | LongWei Ltd. |
| Material | Aluminum |
| Maximum Power | 300 Watts |
| Mfr Part Number | K3010D Black US |
| Model Number | K3010D |
| Output Current | 10 Amps |
| Output Voltage | 30 Volts |
| Output Wattage | 300 Watts |

## Product Details

- **Brand:** LONGWEI
- **Color:** Black
- **Connector Type:** Barrel Connector
- **Input Voltage:** 240 Volts (AC)
- **Material:** Aluminum

## Images

![LONGWEI DC Power Supply Variable,30V 10A 4 Digital LED Display Adjustable Regulated Switching Power Supply Digital with Leads Power Cord Used for Spectrophotometer and lab Equipment Repair (Black) - Image 1](https://m.media-amazon.com/images/I/61Nnzxs4BgL.jpg)

## Available Options

This product comes in different **Color** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ An EXCELLENT quality (but inexpensive) power supply!
*by E***1 on June 17, 2018*

FINAL UPDATE (Hopefully!: I have now been using these 2 supplies for around 4 years and have not had a lick of trouble with either of them. They run very quietly, are very accurate and hold their settings perfectly. I would still recommend swapping out the amperage potentiometer for multi-turn (as long as you are OK with soldering) but it's still a great power supply without it. ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ I really like this power supply. One of the main reasons i bought it was of course its price, but the reason i chose this over the other cheap ones was that, from the reviews i saw on YouTube, the others often seemed to have trouble with the Volt/Amp potentiometers (control knobs). They always seemed to be cheap single-turn ones that failed pretty soon.....and that's why i liked this one, because i knew that the Voltage control pot was multi-turn, and hence was definitely better quality. I am only a real newbie at electronics, but i had learned at least enough to know that. The Voltage pot IS multi-turn and it is easy to get it tuned in very easily. I have seen other guys struggling to tune in the Coarse/Fine pots on other supplies. The Current pot on this one, however, is NOT multi-turn and i wish it was....but it's still smooth and easy to work with. The calibration seems spot-on out of the box, but i know that i can fine tune it if need be from the trimmers inside, so no worries. UPDATE: I just purchased a second one of these and checked it out internally.....it is VERY easy to upgrade the current (amps) control to multi-turn also. I see they are 10K pots (WXD3-13 2W 10K...Google it) and i just purchased ten of these for $13 from Ebay and will be installing one in each of my power supplies' current contol. It's not a big deal but for $1 or so then why not? The other main reason i chose this one was that i saw how the other cheap supplies have the BIG flat heat sink aluminum plate slapped straight across the air flow towards the rear of the case, so all the other components get fried at the expense of the main chip staying cool! That seemed awful design to me. This chip has plenty of cooling (on nice proper finned heat sinks) but so does everything else because the main board is set parallel to the case so gets plenty of air flow. The fan cuts in and out under thermal control, except it does a quick self test upon power-up. The only thing i would wish here is that the speed could also be thermally controlled, but that is nit-picking and i could modify it myself anyway later if needed. The fan does NOT seem unduly noisy when it does come on and is not annoying to me. The voltage actually runs up to 31.9 volts and the current to 11.4 amps, so you get plenty for your money here. For newbies (like me!) to set the current, you have to short out the croc clips while at a low (4 to 7) voltage. After that, upon applying your load, the current will gradually increase as you increase the voltage....until you hit your set current and then it will switch to constant current mode and only the voltage will increase. OK, i will quit teaching the experts how to suck eggs here and leave it at that. In my view, this is an EXCELLENT power supply. The only reason i have taken off one star is because 5 stars would be "perfect" and since that doesn't exist, i have taken one off for the above nit-picky points. There aren't many reviews online of this power supply so i wanted to help correct that. My supply has worked faultlessly since purchase but that has only been a week, although i have tested it pretty rigorously in that time. If anything should change regarding my review, i will make an update here to let people know. I was going to purchase this on Ebay but then noticed it on Amazon for only a couple of dollars more, so i thought it was worth that to get the better "returns" peace of mind because with my Prime membership they will pay the return for me and i can also try it free for a month and, if i don't like it, i can return it for any reason. And no, Amazon don't pay me for this! Lol! UPDATE OK It has now been around 10 months since my purchase (just bought a second one!) and just wanted to say that there has been no change to my assessment. This power supply has been great in use and has never given me a problem. Just for those (like me) that worry that the thing might blow up after a month or two, it has never given any hint of a problem, and some of my usage has fairly put it to the test. OK...that's it. I will update again if this changes, also. UPDATE2 I have now swapped out the current pot in my supply for a 10K multi-turn pot and it is now a SUPERB power supply! It really has made a huge difference for the cost of $1.30 per supply. I highly recommend this modification AND the supply. UPDATE4 (3 was at the beginning) Six years now and counting. This thing is now perfect with no issues at all. I have now updated the stars here to 5 stars....it's perfect.

### ⭐⭐⭐⭐⭐ Would definitely recommend
*by P***S on December 28, 2020*

I've been using this supply daily since I've received it. I've charged sla batteries, used it to test a suspected faulty truck blower motor, charge lithium ion and phosphate batteries, and power a few high power led lights for testing, along with anodizing some titanium parts for fun (large and small). I have to say I'm more than satisfied. The voltage display is adequate, though the voltage is in 0.01 increments (if you're gentle and patient), to overcome the limitations of the display I simply piggy back a trusted digital volt meter no big issue there. Ive observed the voltage is satisfactorily stable all the way up to its 10 amp limit. I believe the unit is actually pretty well overbuilt as well, as I've had no issues drawing the full 10 amps, and a bit more with no overheating issues. The fan is temperature or load responsive and only runs when necessary, so no constant noise, and when it does run its not annoying at all. I haven't opened it up yet to observe the build quality, but only because I've been satisfied and impressed so far. The included test leads are also a surprise, I was fully prepared to build my own to replace them, but once again I've been adequately impressed by them as well. So, all of that to say its a solid little unit for the money and does everything its supposed to, and does it well.

### ⭐⭐⭐⭐ Power Supply
*by M***5 on January 30, 2025*

The only reason I am giving this four instead of five stars is because I thought you would be able to set the amperage and it would remain there. This seems to require you to set the voltage and then it varies the amperage. This is my first power supply so I am definitely not an expert at how these things work. With that being said, I am using this with my DIY nickel plating setup and it seems to work well, especially considering the price point. It seems to do the job just fine!!!

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*Product available on Desertcart United Kingdom*
*Store origin: GB*
*Last updated: 2026-06-25*