When you're planning a DIN-rail power layout in an industrial control cabinet, the first question is usually: what voltage do my loads need? In the world of industrial power supplies transformers, two new switching power supplies represent two common answers. The MEAN WELL SDR-240-48 and the NEW NDR-120-24 are both designed for DIN-rail mounting, but their output voltages and feature sets suit different jobs.
Quick Verdict
Go with the MEAN WELL SDR-240-48 if you need adjustable output and active PFC, or if your system uses the higher voltage it provides. Choose the NEW NDR-120-24 if you want a lower-priced supply with a straightforward lower-voltage output.
Comparison Table
| Feature | MEAN WELL SDR-240-48 | NEW NDR-120-24 |
|---|---|---|
| Price | $52.00 | $44.99 |
| Output voltage | 48V DC | 24V DC |
| Output current | 5A | 5A |
| Mounting | DIN Rail | DIN Rail |
| Inrush current | 5A | 5A |
Where Each Wins
The MEAN WELL SDR-240-48 wins for adaptability. The built-in trimmer lets you sweep the output voltage across its range and adjust the current limit, which is handy when a load needs a little more voltage or you want to set a current ceiling. Its high efficiency and active PFC help keep power quality strong, and the slim 63mm metal case fits tight cabinets.
The NEW NDR-120-24 wins on price and simplicity. It offers a direct output for a lower-voltage rail, and it still mounts on the same DIN rail. If your setup doesn't require voltage adjustment or PFC, this unit covers the basic need without extra features.
Product Notes
MEAN WELL SDR-240-48 240W 48V 5A AC to DC DIN-Rail Power Supply
If your cabinet already uses higher-voltage components or you need to fine-tune the output, the SDR-240-48 is the more versatile pick. The built-in trimmer lets you set the voltage anywhere within its adjustment range, and the current limit can be dialed to match your load. That gives you control over how the supply behaves under varying conditions. The metal enclosure is only 63mm wide, which helps when you have breakers and relays competing for rail space. It also has active PFC and is rated up to 94% efficiency, so it runs cooler than a less efficient supply might. The main drawback is the higher price tag, and this unit's output won't help if your system is built around a lower voltage. The operating temperature range is specified as -25 to +70°C, so it can manage warm environments.
NEW NDR-120-24 Industrial DIN Rail Power Supply
If your loads are lower-voltage and you're looking for a lower-priced option, this supply delivers a straightforward DC output. At $44.99, it's $7.01 less than the MEAN WELL. It uses the same DIN-rail mounting method and carries the same 5A inrush current rating, so integration is similar. The blue case makes it easy to identify in a sea of gray components. The output is specified as 24V DC, so it won't power 48V equipment unless you add a DC-DC converter. The wattage in the title differs from what the model name suggests, so we based this recommendation on the consistent 24V specification, which is the practical detail for a lower-voltage system.
Final Choice by Use Case
- For higher-voltage systems that need adjustability: MEAN WELL SDR-240-48. If your equipment needs a higher DC voltage, or you want to adjust toward the upper end of its range, this is the one. You also get a slim metal housing.
- For lower-voltage systems: NEW NDR-120-24. If a straightforward lower-voltage supply is all you need, the lower-priced NDR-120-24 does the job for less.
