Choosing between the HPS PH100MQMJ and the NDR-120-24 is really a question of what your control panel needs: AC control voltage or DC logic power. In the industrial power supplies and transformers world, these two units sit on opposite sides of that split. The HPS is an industrial control transformer with a 100VA rating and a 240/480V primary, while the NDR-120-24 is a DIN rail-mounted power supply that puts out 24V DC at 5A. Which one belongs in your panel depends on your loads and your rail layout.
Quick verdict
If your panel uses 120/240V AC control circuits and you want a panel-mount transformer with screw terminals, the HPS PH100MQMJ is the unit to build around. If you need low-voltage DC for sensors, PLCs, or relays, the NDR-120-24 is the practical choice.
At a glance
| Feature | HPS PH100MQMJ | NDR-120-24 |
|---|---|---|
| Role | 100VA control transformer | DIN rail DC power supply |
| Voltage side | 240/480V AC primary, 120/240V AC secondary | 24V DC output at 5A |
| Mounting | Panel mount, screw terminals | DIN rail mount |
| Condition | New - Open box | New |
| Listed price | $76.82 | $44.99 |
Where each product wins
- HPS PH100MQMJ wins for AC control circuits. It steps line voltage down for 120/240V control loads, which is the classic transformer job in a panel.
- NDR-120-24 wins for DC loads. Its 24V DC output is well suited to the low-voltage devices that many control panels use.
HPS PH100MQMJ 100VA Industrial Control Transformer
The HPS is a workhorse for traditional control voltage. Its 100VA rating and panel-mount design are well matched to control circuits that need 120/240V AC from a 240/480V primary. The screw terminals make wiring straightforward, and the single-phase construction covers common industrial control loads. Choose it when your panel's logic circuits run on AC rather than a DC bus. The limitation here is the packaging: it arrives as a new open-box unit, so treat it as surplus stock and inspect the terminal labels before installation.
NDR-120-24 Industrial DIN Rail Power Supply
The NDR-120-24 takes the opposite approach. It's a DIN rail power supply that delivers 24V DC at 5A, which is useful for sensors, relays, and other low-voltage control equipment. The DIN rail mount is the big advantage here: you can snap it onto a standard rail without extra hardware. It's listed as new, so there's no open-box concern. On the flip side, it won't produce AC control voltage. If your panel is loaded with 120V AC contactors or timers, this supply won't drive those circuits, and you'd still need the transformer or another AC source.
Final choice by use case
Pick the HPS PH100MQMJ when you need a panel-mount transformer to create 120/240V AC control power from a 240/480V line. Pick the NDR-120-24 when your panel is built around 24V DC. The listed prices are $44.99 for the NDR and $76.82 for the HPS, a spread of about $32, so the DIN supply is the lighter hit on the budget-but only if your loads can live on DC. If your controls are AC-based, the HPS transformer is the one that matches the job.
