Choosing between an industrial control transformer and a DIN rail power supply comes down to the kind of power your equipment needs: AC or DC. The Hammond PT50MLI delivers 115V AC from a high-voltage primary, while the MW NDR-120-12 provides 12V DC to low-voltage controls. Here's how they compare.
Quick verdict
If you need a step-down transformer to run 115V control circuits from a 208/230/460V line, the Hammond PT50MLI is the one to pick. If you need a regulated 12V DC supply for sensors, PLCs, or other low-voltage components, the MW NDR-120-12 gives you more usable power for $5 less.
Comparison table
| Feature | Hammond PT50MLI | MW NDR-120-12 |
|---|---|---|
| Price | $44.99 | $39.99 |
| Output | 115V AC | 12V DC |
| Power rating | 50 VA | 120 W |
| Condition | Used | New |
| Mounting | - | DIN Rail |
| Installation area | - | Indoor/Outdoor |
Where each product wins
- Hammond PT50MLI wins if your circuit runs on AC. It steps down 208/230/460V to 115V, making it a direct fit for traditional control transformers in motor starters and relay panels.
- MW NDR-120-12 wins if you need DC. It outputs 12V at up to 10A, which is more current than most low-voltage control systems require, and it's built to mount on a DIN rail.
- MW also wins on condition and price. It's a new unit at $39.99, while the Hammond is used at $44.99.
Hammond PT50MLI
This is a straightforward control transformer rated at 50VA with a secondary output of 115V AC. The primary side accepts 208, 230, or 460V, so it can handle a range of industrial line voltages. If you're replacing a burnt-out transformer in an older panel, the Hammond PT50MLI's job is simple: convert high-voltage AC down to a usable 115V for control circuits. The used condition may be a concern if you prefer new components, and the price is a bit higher than the DIN rail supply. But for AC-to-AC step-down duty, this transformer is the one. Keep in mind that its power rating is only 50VA, so it's best for small control loads, not large motors.
MW NDR-120-12
The MW NDR-120-12 is a 12V DC power supply capable of delivering 10A, which works out to 120W. It's brand new, mounts directly onto a DIN rail, and is rated for indoor or outdoor installation. That makes it an easy fit inside a control cabinet or in a weatherproof enclosure. The 12V DC output is ideal for LED indicators, small relays, sensors, and other low-voltage gear that runs on DC. With a price of $39.99, it's slightly less expensive than the Hammond transformer, and it gives you clean, regulated DC power rather than raw AC. The only downside: it won't help if your equipment expects 115V AC, and its output is fixed at 12V, so it can't be adjusted for other voltages.
Final choice by use case
Choose the Hammond PT50MLI when you need 115V AC for control transformers, contactors, or legacy panels. Its multi-tap primary gives you flexibility, but the used condition and higher price make it a more targeted buy.
Choose the MW NDR-120-12 when you're building a new control cabinet with DC controls. It's cheaper, new, DIN rail mountable, and delivers 10A of stable 12V power. For most modern low-voltage control systems, the MW is the better value.
