When you're choosing between industrial power supplies transformers, the first fork in the road is the output voltage. These two DIN-rail units both output 5A and are designed for cabinet mounting, but they target different parts of the control panel. The 120W 24VDC Industrial DIN Rail Power Supply sells for $22.99, while the MEAN WELL SDR-240-48 is priced at $52.00. That $29.01 difference buys you more than just twice the wattage: the MEAN WELL delivers 48V, adjustable output, and a higher efficiency rating.
Quick Verdict
If your control load runs on 24VDC and stays under 120W, the 120W 24VDC DIN Rail Power Supply keeps the purchase simple for $22.99. If you need 240W at 48V, or want the ability to trim the output voltage and current, the MEAN WELL SDR-240-48 is the one to mount.
Comparison at a Glance
| Product | Price | Output | Power | Efficiency | Notable spec |
|---|---|---|---|---|---|
| 120W 24VDC DIN Rail Power Supply | $22.99 | 24VDC, 5A | 120W | ≥85% | Dimensions: 1.7 x 4.8 x 5.1 in |
| MEAN WELL SDR-240-48 | $52.00 | 48VDC, 5A | 240W | Up to 94% | Adjustable 48-55V; active PFC; 63mm width |
Where Each Product Wins
- The 120W 24VDC unit wins on price and compact size. You get a 24V, 5A supply for just over twenty dollars, and the listed dimensions make it a reasonable fit for smaller panels.
- The MEAN WELL SDR-240-48 wins on power and adjustability. It doubles the wattage, adds active PFC, pushes efficiency up to 94%, and lets you adjust the output from 48 to 55V while the current is adjustable from 0 to 5A.
Product Notes
120W 24VDC Industrial DIN Rail Power Supply
Priced at $22.99, this 120W unit is the lower-cost option in this pairing and the one to consider when your circuit is built around 24VDC. The output is listed at 24V and 5A, and the input accepts 100-240VAC, so it can be fed from standard mains. The enclosure measures 1.7 x 4.8 x 5.1 inches, which is a compact footprint for a DIN-rail supply. At 120W, it is the lighter-duty choice, so the limitation shows up quickly if your load climbs past that level or if your equipment expects 48V. For a straightforward 24V, 5A supply at a low price, this is the practical pick.
MEAN WELL SDR-240-48
The MEAN WELL SDR-240-48 costs $52.00 and is built around 48VDC at 5A, with a rated power of 240W. The description gives you constant-voltage mode, an output voltage adjustable from 48 to 55V, and an output current adjustable from 0 to 5A, which is useful when you need to match the supply to a specific load. Active PFC and efficiency up to 94% are also part of the package, along with a metal casing and an ultra-slim width of 63mm. The input range is listed from 88 to 264VAC. The trade-off is the higher price tag and the 48V output: if your controls are wired for 24V, you'll need to use the adjustment range only if it can reach a compatible voltage-and here it bottoms out at 48V, so it is not a direct substitute for a 24V supply.
Final Choice by Use Case
- 24V control loads below 120W: The 120W 24VDC DIN Rail Power Supply at $22.99 is the direct match for 24V circuits.
- 240W loads or 48V equipment: The MEAN WELL SDR-240-48 at $52.00 gives you 240W, a 48V output, and higher efficiency.
- Adjustable output: If you want to dial the output voltage and current to your application, the MEAN WELL's adjustable range is the feature to use.
Both supplies are new DIN-rail units, so the final decision comes down to the voltage your system needs and how much headroom you want.
