When a control cabinet needs 24V DC at 5A, the first question is usually whether the power supply can fit and protect the rail. The Mean Well NDR-120-24 is an AC/DC single-output industrial power supply rated at 120W, sized at 4.5 x 1.6 x 4.9 inches, and built for DIN rail mounting.
Quick verdict
At USD 31.64, this DIN rail supply is a practical candidate when the panel matches its design. Review the trade-offs below before committing.
Who it suits
Panel builders who want a simple supply for a dedicated DC bus will find the NDR-120-24 easy to integrate. The unit includes short-circuit, overvoltage, overload, and overtemperature protection, which is the safety net you want when a fault in one branch should not take down the whole control circuit.
What stands out
Rated efficiency is 88%, ripple and noise are 120mV p-p, load regulation is ±1%, and line regulation is ±0.5%. Those numbers give a practical sense of output stability under changing load and line conditions. The screw-terminal output connector removes the need for a special plug, and the unit accepts 90-264V AC at 47-63Hz, covering common single-phase line voltages. The specification also includes a 100% full load burn-in test, so the unit is meant to be exercised at full load before it reaches you. Approvals include UL, CUL, TUV, CB, CE, EN, and EAC, useful when the panel has to meet multiple regional standards.
Meaningful trade-offs
The practical limitations matter just as much. The NDR-120-24 has no PFC function, so a power-factor-correction requirement rules it out. It is a single-output unit, so plan for exactly one rail. Cooling is by free-air convection, which is silent but depends on air moving through the enclosure. In a sealed or tightly packed cabinet, that can be a real constraint.
Bottom line
At USD 31.64, this is a sensible match for a control cabinet that lines up with the unit's defined scope.
Product note
Mean Well NDR-120-24 AC/DC Single Output Industrial DIN Rail Power Supply
This is the unit under review: a 24V DC, 5A, 120W DIN rail supply with a 90-264V AC input and a screw-terminal output connector. The reason to choose it is the combination of a compact 4.5 x 1.6 x 4.9 inch footprint and the protection set. The limitation is that it is strictly a single-output supply without PFC, so match it to a panel that expects exactly one 24V rail.
