Choosing the right power conversion for an industrial control panel comes down to one question: what voltage do your loads actually need? A 24V DC power supply and a 120V AC control transformer solve different problems, though both are common in automation cabinets. We're comparing a compact 120W DIN rail supply with an Emerson SolaHD control transformer to help you match the unit to your application.
Quick verdict
If your PLCs, sensors, and relays run on 24V DC, the 120W DIN rail supply at $22.99 is the direct, low-cost answer. If your contactors, control relays, or panel lighting need 120V AC and your incoming line is 240V or 480V AC, the Emerson SolaHD E150 at $79.95 is the transformer designed for that job. In short: DC loads point to the DIN rail supply; AC control circuits point to the SolaHD.
Comparison table
| Feature | 120W 24VDC DIN Rail Supply | Emerson SolaHD E150 |
| Price | USD 22.99 | USD 79.95 |
| Output | 24V DC, 5A, 120W | 120V AC (also 115V/110V) |
| Input | 100-240V AC, 50/60Hz | 240x480V AC (also 230x460V, 220x440V) |
| Includes | DIN rail mount housing | Mounting hardware kit, shorting clips, fusing instruction sheet |
| Condition | New | New - Open box |
Where each product wins
The 120W DIN rail power supply wins on price, compact size, and its regulated 24V DC output. It's a plug-and-play power source for DC-powered control components. The Emerson SolaHD E150 wins on high-voltage AC flexibility and traditional transformer isolation, providing a clean 120V AC supply from common industrial line voltages. It also includes mounting hardware and shorting clips in the box.
120W 24VDC 5Amp Industrial DIN Rail Power Supply Single Output 1.7 x 4.8 x 5.1in
If your control components are 24V DC, this supply gives you 24V at up to 5A for a total of 120W, converting 100-240V AC line power. Its 1.7 x 4.8 x 5.1-inch footprint is easy to slot into a DIN rail layout, and the new unit is priced at $22.99, making it a budget-friendly way to power a small control panel. Efficiency is rated at 85%, so it runs reasonably cool for a supply in this class. The main limitation is that output is fixed at 24V DC. If any of your loads require 120V AC, you'll need a separate transformer or converter, since this unit won't produce AC.
NEW Emerson SolaHD E150 Industrial Control Transformer 150VA 240x480V to 120V
When your application requires 120V AC from a higher-voltage line, this transformer provides secondary outputs of 120V, 115V, or 110V AC from primary voltages of 240x480V, 230x460V, or 220x440V. Its 150VA rating (0.150 kVA) is specified for single-phase 50/60Hz operation, with Class 105°C (Class A) insulation. The epoxy-encapsulated construction is typical for industrial control transformers, and the included mounting hardware kit, shorting clips, and fusing instruction sheet make installation straightforward. At $79.95, it's a higher investment than the DIN rail supply, but it's the right tool when your loads are AC. The limitation is that it provides AC only, so you'll still need a separate DC supply if your panel also has 24V components.
Final choice by use case
- For a 24V DC control panel (PLCs, sensors, relays): Choose the 120W DIN rail power supply. It's $22.99, compact, and directly outputs 24V DC.
- For a 120V AC control panel fed by 240/480V: Choose the Emerson SolaHD E150 at $79.95. It gives you 120V AC with the flexibility of multiple primary and secondary voltage taps.
- For mixed panels: You may need both. The DIN rail supply handles the DC side, while the SolaHD handles the AC side.
