For anyone choosing industrial power supplies transformers, the first decision is usually input voltage and output voltage. The Mean Well MDR-100-12 and the PULS QT20.241 sit on different sides of that decision: one is an AC/DC converter, the other a specialist industrial supply. Most projects don't need both. You pick one based on the bus voltage and the feed coming into the cabinet, and the two units represent very different budgets for the same rail-mounted format.
Quick verdict
Choose the Mean Well MDR-100-12 if you want a 12V converter with adjustable voltage, an LED indicator, and a DC OK signal at the USD 29.99 price. Choose the PULS QT20.241 if you need a 24VDC output from a 480VAC feed at the USD 225.00 price. That price gap is the real trade-off, and it makes the voltage question the deciding factor.
Comparison
| Product | Output | Input | Price | Condition |
|---|---|---|---|---|
| Mean Well MDR-100-12 | 12V DC, 7.5A, 90W | AC/DC converter | USD 29.99 | New |
| PULS QT20.241 | 24V DC | 480V AC | USD 225.00 | New open box |
The price difference between the two units is USD 195.01, and that spread is the cost of moving up to a specialist industrial supply. The Mean Well sits at the more accessible end of the DIN rail category.
Where each product wins
The Mean Well MDR-100-12 wins the value side of the comparison and is the easier fit for a lower-voltage control bus. The PULS QT20.241 wins when the job calls for a specialist DIN rail supply with the input and output ratings specified for the panel.
Product notes
Mean Well MDR-100-12 DIN Rail Power Supply
The Mean Well MDR-100-12 is a practical, enclosed DIN rail converter in a white plastic housing. It provides 90W for modest control loads and includes an adjustable voltage control plus LED and DC OK indicators, so you can confirm the supply is operating at a glance. The adjustable feature set makes it useful when a load needs a little fine-tuning rather than a fixed rail voltage. Its main limitation is on the output side: if your loads run on the higher DC voltage, this unit won't drive them directly. For the lower-voltage control bus, it is a straightforward fit at a much lower entry price than the PULS.
PULS QT20.241 DIN Rail Power Supply
The PULS QT20.241 is a DIN rail supply in new open-box condition. The QT20.241 model number is a clear reference point, and the design follows a standard industrial form factor for panel mounting. This unit is the one to choose when the project calls for a PULS supply with the input and output ratings that match the job. The trade-off is the price: it sits at the higher end of the comparison, so you are paying for the input rating and the PULS designation. If your control bus is on the lower-voltage side, the output rating won't match your loads, and the Mean Well is the better fit.
Final choice by use case
Let the panel's input and output voltage make the call. On the lower-voltage side, the Mean Well MDR-100-12 is the value pick. On the high-line side, the PULS QT20.241 is the specialist match. If you are still torn, the comparison table gives you the matching details to make the decision.
