When you're choosing a replacement or new control transformer in the industrial power supplies transformers aisle, the decision usually comes down to what voltage your controls need and how much capacity they draw. The ACME TA-2-81321 and the HPS PH100MQMJ split those priorities cleanly.
Quick verdict
Choose the ACME TA-2-81321 if the connected load is modest and you want the lower-cost option. Choose the HPS PH100MQMJ if you need more capacity or want extra margin for future loads.
Side-by-side comparison
| Product | Price | Power rating |
|---|---|---|
| ACME TA-2-81321 Industrial Control Transformer 50VA 208/480V To 24V | USD 44.99 | 50 VA |
| 1 Unit ~ HPS PH100MQMJ 100VA Industrial Control Transformer 240x480V | USD 76.82 | 100 VA |
What matters most
The main difference is capacity per dollar. The ACME keeps the cost down for simple, low-voltage control circuits. The HPS gives roughly twice the load capacity for a higher price. If your control load is small and fixed, the extra capacity is wasted. If the load is large or likely to grow, the extra capacity is the point.
Where the ACME wins
- Lower price: at $44.99, the ACME is 41% below the HPS PH100MQMJ's price.
- Straightforward secondary output: the ACME is the easier match when controls need a low-voltage secondary.
Where the HPS wins
- Higher capacity: the HPS doubles the available VA for larger control loads.
- Expansion headroom: the extra capacity means you are less likely to replace the transformer after adding devices.
Product notes
ACME TA-2-81321 Industrial Control Transformer 50VA 208/480V To 24V
The ACME TA-2-81321 makes sense when your controls all run on 24V and the load is modest. Its 50VA rating is enough for a small group of relays, contactors, pilot lights, and PLC inputs, and the 208/480V primary means you can feed it from either a 208V or 480V line. That straightforward 24V secondary is why many panels start here. The limitation is headroom: 50VA disappears quickly as you add devices, so you need to total up your load before buying. If the total is close to or above 50VA, this unit will be undersized. If it stays comfortably under that figure, the ACME is the cheaper, cleaner option.
1 Unit ~ HPS PH100MQMJ 100VA Industrial Control Transformer 240x480V
The HPS PH100MQMJ is for panels that need more breathing room. With a 100VA rating, it doubles the capacity of the 50VA ACME and can handle a larger collection of control components without forcing you to upgrade later. The 100VA rating is the main reason to step up. The main limitation is the higher price; if your actual load never passes 50VA, you are paying for capacity you may not use. That is the classic overbuying trap, so be honest about today's load before choosing it. For a panel that is already near its limit or likely to gain loads, the extra VA gives you room to grow.
Final choice by use case
Before ordering, total up every device on the secondary and leave some margin. A good rule is to match the transformer to the load you have today, with enough headroom for the next change you can already see coming. If the sum fits comfortably within the ACME's rating, the ACME TA-2-81321 is the natural fit. For heavier loads, an existing load near the limit, or any plan to add devices later, the HPS PH100MQMJ is the more practical choice. There is no universal winner; the right choice depends on the load.
