When you're building or upgrading an industrial control panel, one of the first decisions is how to get reliable 48V DC power to your PLC, sensors, or field devices. The challenge is finding a supply that fits neatly on a DIN rail, doesn't overcrowd the cabinet, and still delivers clean, adjustable power. The MEAN WELL SDR-240-48 aims to solve that with a 240W output in a remarkably slim package, and at USD 52.00 it sits in a practical spot for panel builders and maintenance teams.
Quick verdict
The MEAN WELL SDR-240-48 is a 240W single-channel DIN-rail power supply that takes 100-240V AC input and delivers 48V DC at 5A. Its standout trait is the ultra-slim 63mm width, which makes it a strong candidate if cabinet space is tight. The metal casing and screw-terminal style are typical for industrial gear, but the efficiency rating of up to 94% and the wide operating temperature range of -25°C to +70°C are the kind of details that matter on the plant floor.
If you need a straightforward 48V rail without paying for extra features you won't use, this supply is worth a close look. It also has an active PFC function, which helps with power factor in installations where that matters.
Who it suits
This supply is a natural fit for control cabinets that need a single 48V DC rail. Because it's DIN-rail mountable and slim, it's easy to slot into a crowded enclosure. The adjustable voltage (48 to 55V) and adjustable current (0 to 5A) give you a bit of tuning flexibility if your load has specific requirements or you need to compensate for voltage drop on longer cable runs.
It's also a good match for environments where temperature swings are a concern. The -25°C to +70°C operating range (at case temperature, under free air convection) means it can handle less-than-ideal ventilation, though you'd still want to keep airflow in mind.
What stands out from the listed details
The combination of 240W output and 63mm width is the headline. Many industrial supplies with this power level are noticeably wider, so the SDR-240-48 helps you use vertical space more efficiently. The 94% efficiency is another strong point-less energy lost as heat means a cooler cabinet and lower operating cost over time.
Input flexibility is practical too: the supply accepts 88 to 264VAC, covering common single-phase industrial voltages without needing to change units when you're working across different sites. The active PFC function brings the power factor to 0.93, which can be a useful feature in facilities that track power quality.
Meaningful trade-offs
There's no display or digital monitoring, and the output adjustments are made via onboard trimmers rather than a software interface. That's not a drawback for many panel applications, but if you need remote monitoring or programmable curves, this isn't that kind of supply.
Also, note the current rating: 5A at 48V. If your loads pull more than that or you need redundant power, you'd want a larger or paralleled solution. And while the wide temperature range is attractive, the power supply depends on free air convection, so mounting orientation and clearance-especially with the 63mm narrow footprint-still matter for full output.
Bottom line
For a 48V DIN-rail power supply that balances space efficiency, efficiency, and adjustability, the MEAN WELL SDR-240-48 at USD 52.00 is a sensible choice. It gives you the core features an industrial panel needs without unnecessary complexity. If you're outfitting a cabinet and want a slim, capable 48V rail, put this one on your shortlist.
MEAN WELL SDR-240-48 240W 48V 5A AC to DC DIN-Rail Power Supply 100-240v input
This is the only supply under consideration here, and it's a coherent package: 240W nominal power, 48V DC output at a rated 5A, and input accepted from 100-240V AC. The metal casing and ultra-slim 63mm width help with heat dissipation and panel layout. One particular detail to keep in mind is that the voltage output is adjustable from 48 to 55V, and current from 0 to 5A-useful when your load isn't exactly at the nominal point. The listed price of USD 52.00 makes it a low-risk pick for a dedicated 48V bus, but if you needed a higher current or a different voltage, this specific model's fixed 5A output would be a limit to weigh before buying.
