Isolation transformers and voltage-conversion transformers are easy to confuse: they all sit between your power source and your equipment, but they solve different problems. Some isolate sensitive gear from electrical noise, some step a three-phase feed up to a higher voltage, and some give you a much larger, cleaner three-phase supply for industrial machinery. The four products in this comparison cover all three jobs, with listed prices spanning a very wide range. Before you choose, you need to sort out two things: what voltage and phase your equipment needs, and how much power it actually draws.
Quick take
If you need a small single-phase isolation conditioner for an audio or bench setup, the Xtreme Power JX-200 is the compact option. If you're converting three-phase 220V to 380V, the SFX unit is the only product here that names that exact conversion. If you need a new three-phase industrial isolation transformer, the Sheng Yu unit is the one to focus on. And if you want the highest capacity in this set and can work with used industrial gear, the Hammond 1648061 is the largest-capacity option.
Listed price comparison
The listed price spread runs from $135 to $3,462.89, a difference of more than $3,300 between the compact conditioner and the industrial 30kVA unit.
| Product | Listed Price | Price Bar |
|---|---|---|
| Sheng Yu 30kVA Isolation Transformer | USD 3,462.89 | |
| Xtreme Power JX-200 | USD 135.00 | |
| SFX 10KW 3-Phase 220V to 380V | USD 1,399.00 | |
| Hammond 1648061 75kVA | USD 1,000.00 |
Decision matrix
| Shopper need | Listed product to consider | Why |
|---|---|---|
| Small single-phase isolation with surge protection | Xtreme Power JX-200 | Slim case, passive cooling |
| Three-phase voltage conversion | SFX unit | Matching voltage pair for three-phase equipment |
| New three-phase industrial isolation | Sheng Yu unit | Schaffner filter, new-in-box, wheeled housing |
| Maximum kVA for industrial automation | Hammond 1648061 | Copper windings, NEMA 3R enclosure, high capacity |
Product notes
Sheng Yu 30kVA Isolation Transformer
This new-in-box unit is the highest-priced option here at $3,462.89, and it pairs a 30kVA capacity with a Schaffner industrial EMC filter, a 450V AC primary, and a 40A primary rating inside a wheeled industrial housing. Choose it when you need a large three-phase isolation transformer and clean power delivery is a priority. The limitation is the industrial electrical spec: 450V primary and 40A are not standard wall-outlet numbers, so this is for a dedicated power distribution system rather than a plug-in appliance.
Xtreme Power JX-200
At $135, this is the most compact and least expensive option in the group. The JX-200 is rated 200VA/200W, takes 120V AC in and outputs 120V AC, and includes surge protection, passive cooling, and a slim form factor that can be wall-mounted. The reason to choose it is straightforward: you want a small isolation conditioner for a sensitive low-power component on a standard 120V circuit. The limitation is that 200VA is the smallest rating here, and because input and output are both 120V, it doesn't convert voltages; it only isolates and conditions the existing 120V feed.
SFX 10KW 3-Phase 220V to 380V
Listed at $1,399, the SFX 10KW is the only product in this comparison that specifically advertises a three-phase 220V-to-380V conversion, with a 10kW maximum compatible appliance wattage. Pick it if your incoming supply is three-phase 220V and your equipment wants 380V. The unit works normally with load imbalance up to 25%; beyond that, the voltage becomes unbalanced and current flows in the neutral wire, so you need a reasonably balanced three-phase load. That's the real constraint to plan around.
Hammond 1648061 75kVA
This used Hammond unit is listed at $1,000 and offers the largest nameplate rating in the group at 75kVA. Copper windings, a NEMA 3R enclosure, a 200-480V primary, a 210Y/121 secondary, and an approximate weight of 800 lbs round out the specifications. Choose it when you need substantial three-phase isolation capacity for industrial automation. The limitations are condition and physical scale: it's a used unit, it weighs roughly 800 lbs, and the secondary voltage configuration needs to match your load, so this is not a casual plug-in device.
Final recommendation
For a small single-phase setup on a standard 120V outlet, the Xtreme Power JX-200 gives you isolation in a wall-mountable slim case at the lowest listed price in this comparison. For a three-phase voltage-conversion job, the SFX unit is the direct match. For a new industrial installation with a 450V primary and a need for isolated three-phase power, the Sheng Yu unit is the one to specify. For the highest capacity at the lowest listed price among the three larger units, the used Hammond 1648061 is the industrial choice.
