Shopping for an industrial power supplies transformer means matching capacity, input voltage, and output voltage to your control panel. The two units here take different approaches: the HPS PH250MQMJ is built for higher VA needs on a 480V primary, while the ACME TA-2-81321 covers 208/480V inputs and delivers a stepped-down output for small circuits. The right choice comes down to how much load you need to carry and how flexible your incoming supply is.
Before diving into the comparison, think about what the transformer will feed. A single relay or pilot light draws little power, while a control cabinet with several contactors and indicators can easily exceed the capacity of a small transformer. Matching the VA rating to the load is the single most important step.
Quick Verdict
If your control panel needs generous power headroom, the HPS PH250MQMJ is the stronger candidate. If you're powering a small control load and want input flexibility, the ACME TA-2-81321 gets the job done with a more modest footprint.
Comparison
| Feature | HPS PH250MQMJ | ACME TA-2-81321 |
|---|---|---|
| Price | $149.99 | $44.99 |
| VA Rating | 250VA | 50VA |
| Primary Voltage | 480V | 208/480V |
| Notable Spec | 2.08A current rating | 24V secondary output |
Where Each Product Wins
The HPS PH250MQMJ wins when you need higher capacity. With a larger VA rating and a defined current spec, it has the muscle for control circuits that power multiple contactors or relays. Its single-voltage primary is straightforward to wire for plants that standardize on one supply. If you're building a panel with room to expand, the extra VA headroom saves you from replacing the transformer later.
The ACME TA-2-81321 wins on flexibility and output voltage. Its dual primary accepts two common line voltages, and its low-voltage secondary is a direct match for many PLC and relay control circuits. For smaller loads, it offers a compact alternative. When the job is simple and the load is small, this transformer gets you up and running without over-specifying the hardware.
Product Notes
HPS PH250MQMJ
The HPS PH250MQMJ is the higher-capacity transformer in this pair, rated at 250VA with a 2.08A current spec. That makes it a solid choice for control panels that power multiple contactors, relays, and indicator devices from a single source. The unit is new open-box. Because it is built around a single-voltage primary, it's best matched to a plant that already runs that supply voltage. The 250VA rating gives you headroom to add control devices later, and the 2.08A spec gives you a concrete figure to estimate whether it can handle your load. If you need a transformer that can carry more than a small relay circuit, this is the one to reach for. The limitation is that a single-voltage primary cuts down on flexibility if your facility uses multiple supply voltages. For a panel that is likely to grow, the extra VA headroom means you won't have to recalculate your power budget as you add devices. If your control power requirements are already close to the smaller unit's rating, stepping up to the 250VA unit gives you a safety margin.
ACME TA-2-81321
The ACME TA-2-81321 is the compact 50VA option with a dual-rated primary and a 24V secondary. The dual primary means it can connect to either of the two line voltages shown in its name, which makes it useful for facilities that have mixed supply voltages in different areas. The 24V output is a common control voltage for relays, PLC I/O, and small pilot devices, so it fits many existing control schemes. It is in new open-box condition. The limitation is capacity: at 50VA, it won't support larger banks of control equipment, so it's best reserved for low-power circuits. For a small control transformer that offers voltage flexibility and a straightforward wiring path, this is the practical pick. If you only need to power a few small devices, buying the smaller unit keeps the cost down and simplifies wiring. The dual primary also reduces the need to stock two separate transformers in multi-voltage facilities.
Final Choice by Use Case
Choose the HPS PH250MQMJ when your control panel needs extra VA headroom and you want a transformer that can handle more than a minimal control load. Choose the ACME TA-2-81321 when you need low-voltage control power, have a dual-primary supply, and your load is modest.
