When you're shopping for industrial power supplies transformers, the first fork in the road is usually output voltage and current. The MEAN WELL SDR-240-48 produces 48V at 5A, for a rated 240W, while the 10A Industrial DIN Rail Power Supply (NDR-120-12) produces 12V at 10A, for a rated 120W. Both are new DIN rail mount units, but they are aimed at different loads. Matching the rail voltage to your equipment keeps the panel simple and avoids an extra converter.
Quick verdict
If your system needs the higher-voltage, higher-wattage rail, pick the MEAN WELL SDR-240-48. If your equipment runs on the 12V bus, pick the NDR-120-12. The right choice depends on the bus voltage and how much current your devices actually draw.
At a glance
| Feature | MEAN WELL SDR-240-48 | 10A Industrial DIN Rail Power Supply (NDR-120-12) |
| Listed price | USD 52.00 | USD 39.99 |
| DC output | 48V | 12V |
| Rated current | 5A | 10A |
| Rated power | 240W | 120W |
| Mounting style | DIN Rail Mount | DIN Rail Mount |
| Condition | New | New |
Where each wins
MEAN WELL SDR-240-48
The output voltage adjusts from 48V to 55V and the current from 0 to 5A, which gives you room to fine-tune the rail. The unit reaches up to 94% efficiency, meaning less heat inside the enclosure, and the 63mm slim width frees up space next to breakers. This is the model to choose for a higher-voltage bus and larger loads.
NDR-120-12
The 10A output on a 12V rail suits control circuits, relays, and indicators that need more current than a small brick can provide. Its blue housing makes it easy to spot, and the listed indoor/outdoor installation area gives flexibility for enclosure location. For typical 12V panels, it covers the job cleanly.
Product notes
MEAN WELL SDR-240-48 240W 48V 5A AC to DC DIN-Rail Power Supply 100-240v input
Choose this MEAN WELL when your device bus runs at 48V and needs up to 240W. The adjustable 48-55V output and 0-5A current range let you set the rail closer to the actual load, and the 94% efficiency cuts wasted heat in a sealed cabinet. The metal casing and 63mm slim profile are practical for crowded industrial enclosures. The trade-off is on the current side: at 5A, it is not the supply for high-current 12V circuits, so if your panel is built around 12V devices, this unit will not be a natural fit.
10A Industrial DIN Rail Power Supply,NDR-120-12 Output 12V Power Supply
Pick this NDR-120-12 when the control voltage is 12V and the devices draw a healthy current. The 10A output supports a 120W rail for sensors, relays, and indicator lights, and the blue housing helps you identify it quickly in a mixed panel. The listing for indoor/outdoor installation areas adds flexibility if the enclosure sits in a semi-protected spot. The main limit is the 120W ceiling: it cannot feed 48V equipment or loads that need the 240W capacity of the MEAN WELL, so keep it on 12V duty.
Final choice by use case
Choose the MEAN WELL SDR-240-48 for a 48V bus with larger loads; its adjustable output and high efficiency justify its position in this pair. Choose the NDR-120-12 for a 12V control system; it gives you the current you need without paying for more wattage than you'll use.
