Choosing a DIN-rail power supply for a control cabinet usually comes down to three questions: what DC voltage do your loads need, how much current will they draw, and how much space do you have? The four industrial power supplies here cover different output voltages and power levels, so the right pick depends less on which is right overall and more on matching the supply to the specific application.
Quick take
The MDR-100-12 is the one to start with for low-voltage control circuits. The EDR-120-24 fits standard automation panels. The SDR-240-48 covers systems that need more power headroom. And the PULS ML50.102 is the choice when panel space is limited.
Listed price comparison
Listed prices for the four units span from USD 28.00 to USD 61.22.
| Product | Output | Power | Price | Price bar |
|---|---|---|---|---|
| Mean Well MDR-100-12 | 12V DC, 7.5A | 90W | USD 29.99 | |
| Mean Well SDR-240-48 | 48V DC, 5A | 240W | USD 52.00 | |
| Mean Well EDR-120-24 | 24V DC, 5A | 120W | USD 28.00 | |
| PULS ML50.102 | 12-15V DC, 4.2A | 50W | USD 61.22 |
Decision matrix
- Low-voltage control circuits: the MDR-100-12.
- Standard automation panels: the EDR-120-24.
- Higher-power systems: the SDR-240-48.
- Compact low-voltage rail: the PULS ML50.102.
Product notes
Mean Well MDR-100-12
The MDR-100-12 is a 12V DIN-rail supply rated for 7.5A and 90W. Its enclosed white housing includes an LED indicator and DC OK signal, which makes it easy to confirm that the rail is powered and to pass that status into your control logic. The output voltage is adjustable, so you can fine-tune the rail to match your load. At USD 29.99, it is the second-lowest price in this group. The limitation is the 90W ceiling: if your 12V loads add up to more than 7.5A, you will need a larger supply or a second unit.
Mean Well SDR-240-48
The SDR-240-48 is the highest-wattage unit here, delivering 48V DC at 5A for 240W. The metal casing is ultra-slim at 63mm, which helps when panel space is tight. Built-in active PFC improves the input power factor, and the output voltage can be adjusted from 48V to 55V, with output current adjustable up to 5A. It is rated to operate from -25 to +70°C case temperature under free air convection. At USD 52.00, it sits between the low and high price points in this comparison. The practical limitation is the 48V output: if your controls run on 12V or 24V, you would need a DC-DC converter to use this supply.
Mean Well EDR-120-24
The EDR-120-24 is the lowest-priced supply in the comparison at USD 28.00, and it provides a 24V DC rail at 5A for 120W. That voltage and current combination suits relays, sensors, and many small automation modules. The input range is 100-240VAC, so it can work with standard line voltages. The main trade-off is the 120W capacity: 5A is fine for modest loads, but a bank of high-current actuators can quickly exceed it. If your 24V equipment is spread across multiple devices, calculate the total current draw before committing to this unit.
PULS ML50.102
At USD 61.22, the PULS ML50.102 is the most expensive option here, and it is aimed at a different kind of use: an adjustable 12-15V DC output at up to 4.2A and 50W. The compact switched-mode design is intended for control cabinets, factory automation, instrumentation, and sensitive electronic equipment where a stable low-voltage rail is needed and space is limited. The adjustable voltage range gives you some flexibility to trim the output. The limitation is power: 50W is not enough for large motors or high-current automation banks. For loads above 4.2A, you will need one of the higher-wattage supplies in this roundup.
Final recommendation by use case
- For a low-voltage control circuit, choose the Mean Well MDR-100-12.
- For a standard automation panel with modest loads, choose the Mean Well EDR-120-24.
- For a system that needs more power headroom, choose the Mean Well SDR-240-48.
- For a low-voltage rail where panel space is tight, choose the PULS ML50.102.
