When you're selecting an industrial power supply transformer for a control panel, the first question is not the brand. It's whether the transformer's primary voltage, secondary voltage, and VA rating line up with the circuit it will feed. The four transformers in this comparison cover different primary-to-secondary combinations and different power sizes, and their prices range from $44.99 to $175. Before choosing, map your incoming line voltage and your control load; after that, the decision becomes much easier.
Quick take
The lowest-priced unit in this set is the ACME TA-2-81321 at $44.99, and the top-priced unit is the Square D 9070TF100D1 at $175.00. In between, the Acme Transformer TA-2-81210 and the Emerson SolaHD E150 give you two middle options. If your control circuit runs on 24V, the ACME TA-2-81321 deserves attention. If you need 120V and more capacity, the Emerson SolaHD E150 is the 150VA option in the group. The Square D 9070TF100D1 is the one tagged simply as New.
Listed price comparison
| Product | Price | Price bar |
|---|---|---|
| ACME TA-2-81321 Industrial Control Transformer 50VA 208/480V To 24V | USD 44.99 | |
| Acme Transformer TA-2-81210, Industrial Control Transformers, 50VA, 240X480 PRI | USD 50.00 | |
| NEW Emerson SolaHD E150 Industrial Control Transformer 150VA 240x480V to 120V | USD 79.95 | |
| 9070TF100D1 Square D Industrial Control Transformer New USA | USD 175.00 |
Decision matrix
| Product | Choose it when | Trade-off to know |
|---|---|---|
| ACME TA-2-81321 | You want a 24V secondary at 50VA from a 208/480V primary | The 50VA rating sits at the lower end of this set |
| Acme Transformer TA-2-81210 | Your primary is 240x480V and a 50VA unit fits the load | The open core and coil type is not a fully enclosed unit |
| Emerson SolaHD E150 | You want 150VA with 120V secondary from a 240x480V primary | The condition is New - Open box |
| Square D 9070TF100D1 | You want a New-condition Square D unit and can work with the $175 price | The price is the top end of this comparison |
Product notes
ACME TA-2-81321 Industrial Control Transformer 50VA 208/480V To 24V
The ACME TA-2-81321 is the lowest-priced transformer in this group at $44.99. Its 50VA rating makes it suitable for a compact control circuit, and the 208/480V primary with a 24V secondary gives it a clear role: feed a 24V control bus from a common industrial primary. The condition is New - Open box, so the unit may have had the box opened but is still presented as new. The limit to keep in mind is the power size; if your control circuit draws more than 50VA, this transformer is probably not the one to start with.
Acme Transformer TA-2-81210 (50VA, 240x480V Primary)
The Acme Transformer TA-2-81210 gives you a different primary path. It is a 50VA industrial control transformer with a 240x480V primary, a 50/60Hz operating range, and an insulation class of 130. It is specifically an open core and coil unit, so the transformer comes without a surrounding enclosure. That makes it a sensible pick when you are already working inside a panel that provides the mechanical protection. The limitation is the open construction: it is not a fully enclosed transformer, so it relies on the surrounding cabinet for containment.
Emerson SolaHD E150 (150VA, 240x480V to 120V)
For a control circuit that wants 120V, the Emerson SolaHD E150 is the clearest fit in this comparison. The title states 150VA and a 240x480V primary stepping down to 120V, which puts it in a different power class than the two Acme units. It is specified for 50/60 Hz and includes a Class 105 C insulation rating. The condition is New - Open box, so the transformer itself is the focus rather than a sealed retail presentation. The trade-off is the open-box condition; if the originality of the carton matters to you, that is the detail to weigh.
Square D 9070TF100D1 Industrial Control Transformer New USA
The Square D 9070TF100D1 is the top-priced unit in this set at $175.00. Its title pairs the Square D brand with a clean New condition, and the model number is presented as 9070TF100D1. If your concern is getting a transformer whose condition is tagged as new rather than open box, this is the one in the group that stands apart. The trade-off is the price ceiling: at $175.00, it is the highest-priced entry in the $44.99-to-$175 comparison, so it makes sense when your application and budget point to the same model.
Final recommendation by use case
- If you need a 24V secondary from a 208/480V primary, the ACME TA-2-81321 is the natural starting point.
- If your primary is 240x480V and a 50VA open core and coil transformer fits, the Acme Transformer TA-2-81210 is the parallel pick.
- If you want 150VA with a 120V secondary, the Emerson SolaHD E150 is the one to put at the top of your list.
- If your priority is a New-condition Square D transformer and the $175 price is acceptable, the 9070TF100D1 rounds out the matching process.
