When you're comparing industrial power supplies transformers for a DIN-rail cabinet, the output voltage is the first decision. Get it wrong and your loads will not run properly, so the choice deserves a careful look. The MEAN WELL SDR-240-48 is built for 48V loads, while the NDR-120-24 delivers the 24V that many PLCs and sensors expect. Both are new DIN-rail supplies and both can deliver 5A, but they are not interchangeable. This head-to-head helps you choose the right one for your control panel.
Quick verdict
If your equipment runs on 48V DC, the MEAN WELL SDR-240-48 is the more capable unit. It offers a 48V 5A output with adjustable voltage (48-55V) and adjustable current (0-5A), along with active PFC and up to 94% efficiency. If your loads are standard 24V, the NDR-120-24 provides 5A with a simpler 24V output. It costs $44.99 versus $52.00 for the SDR-240-48.
Comparison
| Feature | MEAN WELL SDR-240-48 | NDR-120-24 |
|---|---|---|
| Output voltage | 48V DC | 24V DC |
| Output current | 5A | 5A |
| Mounting | DIN rail | DIN rail |
| Price | $52.00 | $44.99 |
Where each product wins
- The SDR-240-48 wins when you need 48V DC and want to tune the output voltage or current, with active power factor correction and high efficiency.
- The NDR-120-24 wins when your control scheme runs on standard 24V and you need a direct, no-conversion supply rated for 5A.
Product notes
MEAN WELL SDR-240-48 240W 48V 5A AC to DC DIN-Rail Power Supply
The MEAN WELL SDR-240-48 is a 240W industrial DIN-rail power supply with a 48V DC output at 5A. The metal enclosure is ultra slim at 63mm, which helps in crowded cabinets. It accepts 88-264VAC input, covering the usual 100-240V nominal ranges, and with active PFC the power factor reaches about 0.93. Efficiency is high at up to 94%, and the unit is rated to operate from -25°C to +70°C under free air convection. You can adjust the output from 48V to 55V and current from 0 to 5A, allowing you to fine-tune performance for your load. The inrush current rating is 5A. The tradeoff is that this is strictly a 48V supply; if your sensors and logic run on 24V, you will need a converter. For 48V buses, this is the more feature-rich option.
5A Industrial DIN Rail Power Supply NDR-120-24
The NDR-120-24 is a dedicated 24V DIN-rail supply rated for 5A of continuous output, which suits PLCs, relay panels, and many industrial sensors. The blue unit mounts directly on a standard DIN rail, and its inrush current rating is listed at 5A. The listing also notes indoor/outdoor installation areas, which adds placement flexibility. If your control cabinet operates on 24V, this supply connects without extra conversion. The clear tradeoff is that it only puts out 24V, so it cannot serve a 48V bus or any loads that expect higher voltage. For a 24V control circuit, it is a straightforward, no-conversion option.
Final choice by use case
In practice, the choice is dictated by your installed devices. A 48V bus needs the SDR-240-48; a 24V control panel will be happy with the NDR-120-24. Choose the MEAN WELL SDR-240-48 when you need 48V DC and want adjustable output plus high efficiency. Choose the NDR-120-24 when your system is built around 24V and you want a simple 5A DIN-rail supply.
