Rigol DL3021
A well-supported programmable load for testing power supplies and batteries in an electronics lab.
Amazon $549$549
The Rigol DL3021 is the better bench power supply overall, rated 3.8 to 3.5. The Rigol DL3021 leads on output quality and PC control. The Korad KEL2010 wins on resolution, value and protection & features. The Korad KEL2010 costs $24 less ($525 vs $549).
Prices were last checked November 9, 2026. Product prices and availability are accurate as of that date and are subject to change; the price and availability shown on Amazon or the retailer's site at the time of purchase apply. As an Amazon Associate we earn from qualifying purchases.
Korad KEL2010
A 300 W programmable load with fine low-range resolution, for battery and supply testing past 200 W.
Amazon $525$525
Which should you buy?
- Choose the Rigol DL3021 for output quality (15 kHz dynamic mode vs 10 kHz dynamic mode) and PC control (USB, RS232 with SCPI vs USB, RS232, LAN).
- Choose the Korad KEL2010 for resolution (0.1 mV / 0.1 mA setting resolution vs 1 mV / 1 mA setting resolution), value ($1.75 per watt ($525, 300 W rated) vs $2.75 per watt ($549, 200 W rated)) and protection & features (over-voltage protection, over-current protection, remote sense, stored setups vs over-voltage protection, over-current protection, remote sense).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every electronic loads bench power supply; a clear win is highlighted. How we rank explains each one.
| Factor weight | Rigol DL3021 | Korad KEL2010 |
|---|---|---|
| Overall rating | 3.8/5 | 3.5/5 |
| Value 25% | 17 $2.75 per watt ($549, 200 W rated) | 30 $1.75 per watt ($525, 300 W rated) |
| Output quality 20% | 80 15 kHz dynamic mode | 68 10 kHz dynamic mode |
| Resolution 15% | 75 1 mV / 1 mA setting resolution | 100 0.1 mV / 0.1 mA setting resolution |
| PC control 15% | 80 USB, RS232 with SCPI | 70 USB, RS232, LAN |
| Protection & features 10% | 80 over-voltage protection, over-current protection, remote sense | 100 over-voltage protection, over-current protection, remote sense, stored setups |
| Warranty 15% | 100 3-year warranty | 0 warranty not published, scored as none |
Specifications
| Rigol DL3021 | Korad KEL2010 | |
|---|---|---|
| Output | ||
| Type | Electronic load | Electronic load |
| Channels | 1 | 1 |
| Channel ratings | 150 V/40 A, 200 W | 150 V/40 A, 300 W |
| Max voltage | 150 V | 150 V |
| Max current | 40 A | 40 A |
| Rated power | 200 W | 300 W |
| Dynamic mode | 15 kHz | 10 kHz |
| Load modes | CC, CV, CR, CP | CC, CV, CR, CP |
| Precision | ||
| Setting resolution | 1 mV / 1 mA | 0.1 mV / 0.1 mA |
| Readback resolution | 1 mV / 1 mA | 0.1 mV / 0.1 mA |
| Remote sense | Yes | Yes |
| Control | ||
| PC interfaces | USB, RS232 | USB, RS232, LAN |
| SCPI | Yes | - |
| Stored setups | - | 100 |
| Over-voltage protection | Yes | Yes |
| Over-current protection | Yes | Yes |
| Build | ||
| Weight | 16.7 lb | - |
| Warranty | 3 years | - |