When you are comparing industrial power supplies transformers for a panel, the first thing to sort out is which line voltage you actually have. Control transformers are simple in theory: step a higher voltage down to a level control circuits can use. The hard part is matching the input range and price point. That's the trade-off with the Eaton C5000K2A and Hammond PT50MLI. One is described as new, the other as used, and their voltage options don't line up exactly. The Eaton is the higher-priced new option; the Hammond is the lower-priced used option. Here's how to decide.
Quick verdict
The Hammond PT50MLI is the better choice when you only need a 115V control transformer; the Eaton C5000K2A is the better choice when you want a more fully specified unit. Your input voltage will point you in the right direction faster than any other single detail. If you are still unsure, let price and input voltage drive the choice.
At a glance
| Feature | Eaton C5000K2A | Hammond PT50MLI |
|---|---|---|
| Listed price | USD 450.00 | USD 44.99 |
| Condition | New | Used |
| Primary voltage | 220-240V and 440-480V | 208/230/460V |
| Secondary voltage | 110-120V | 115V |
Both output voltages are close enough that the primary side is usually the deciding factor. In this price range, the differences are practical, not cosmetic.
Where the Eaton C5000K2A wins
- It lists 2A primary and secondary current ratings, giving you more electrical detail.
- It is rated for 50/60Hz operation, so it fits panels that need that frequency flexibility.
Where the Hammond PT50MLI wins
- It is the more economical option by a clear margin.
- It includes 208V on the primary side, which the Eaton's listed input does not cover.
Product notes
Eaton C5000K2A
The Eaton C5000K2A is the option to pick when you want a new unit and a higher level of specification. It lists 2A primary and secondary current ratings and 50/60Hz operation, and its $450.00 price is the trade-off: for a basic control-transformer job, that is a lot more than the $44.99 Hammond. If you need a new component and can use the listed current ratings and frequency range, the Eaton gives you that detail. In an industrial panel, having current ratings written out can save you from guessing whether the transformer matches the load. The new condition is a real advantage, but the price is hard to justify unless you specifically need those extras. It is also the more expensive route, so this is a purchase you make when you want the extra specification and the new condition.
Hammond PT50MLI
The Hammond PT50MLI is the practical pick when price is the main concern. At $44.99 it is far less expensive than the Eaton, and its 50VA design is clearly labeled in the title and specification. The limitation is condition: it is described as used, so it is not factory-new like the Eaton. If you can accept a used unit and want a straightforward control transformer without a larger outlay, this Hammond is the sensible choice. It is a straightforward unit with a clear model number and a clear 50VA rating, which is useful when you are matching a replacement part. That makes it a candidate for a one-off control panel where a 50VA transformer is enough.
Final choice by use case
- For a lower-cost replacement: Choose the Hammond PT50MLI.
- For a more fully specified new-build option: Choose the Eaton C5000K2A.
