When you need voltage regulation on an industrial line, the transformer you choose has to match the load, the mounting, and the price you can justify. This lineup spans a small refurbished component, two Noratel control units, and a 75kVA three-phase power transformer, so the real decision is scale: board-level work, panel-mounted control, or plant-floor power.
Quick take
If you are working on a circuit board, the seller-refurbished ST-6358 is the inexpensive multi-pin option. For a 230V-output control transformer with a terminal block and IP20 enclosure, the Noratel EFA AAA suits panel mounting. If you prefer a factory-new 90 VA isolating transformer, the Noratel FR78B-400230 is the straightforward choice. And if you need heavy three-phase step-up/step-down conversion at 480V to 400V, the XING Laser 75kVA unit is the one to plan around.
Listed price comparison
| Product | Listed price | Price bar |
|---|---|---|
| ST-6358 Multi-Pin Tested Refurb | USD 28.95 | |
| Noratel EFA AAA 230V Output Control | USD 210.00 | |
| Noratel FR78B-400230 90VA | USD 279.15 | |
| XING Laser 75kVA 3-Phase | USD 1,800.00 |
Decision matrix
| Product | Consider it if you need... | Keep in mind... |
|---|---|---|
| ST-6358 | a low-priced, multi-pin component for soldered board assembly | seller-refurbished; component-level part |
| Noratel EFA AAA | a 230V-output control transformer with terminal block mounting | open-box condition; conflicting VA figures in the listing |
| Noratel FR78B-400230 | a new 90 VA isolating transformer | listed details center on VA rating and isolating type |
| XING Laser 75kVA | three-phase 480V-to-400V industrial conversion | load capacity is limited to 65% of rated draw |
Product notes
Small Industrial Component Isolation Transformer ST-6358 Multi-Pin Tested Refurb
At USD 28.95, this seller-refurbished German component sits at the bottom of the listed price range. Its multi-pin layout and MPN ST-6358 reference make it a candidate for board-level isolation or gate-drive circuits where a drop-in soldered part is needed. The refurbishment and continuity testing are the selling points, and the German origin gives a specific manufacturing footprint. The trade-off is scale: this is a component rather than a standalone panel transformer, so it will not drive a machine load or replace a control transformer. If your project is a repair or prototype board, this is the entry-level pick; if you need a mounted power transformer, keep reading.
Noratel 850VA Isolation Transformer EFA AAA 230V Output Industrial Control 3.69A
This Noratel unit from Ocean Spares Tech is aimed at industrial control panels. It carries a 3.69A primary current rating, a 230V output reference in the title, and the listed frequency range covers both 50 Hz and 60 Hz. The IP20 rating and terminal-type screw terminal block point to enclosed or panel-base mounting. It is new open-box, so the price of USD 210 reflects a unit that may not be factory-sealed. The title and attribute list disagree on VA (850VA vs. 230 VA), so the consistent anchor points are the 3.69A primary rating and 230V output. Choose it for a control application where those current and voltage figures fit.
Noratel Industrial Isolation Transformer - FR78B-400230 90VA
This Noratel isolating transformer is listed as new and rated 90 VA, and it comes through RF Waves Australia. The FR78B-400230 model number in the title pairs 400 and 230 designations, and the description places Noratel transformers in systems from ships and trains to wind turbines and medical devices. If your design is built around a specific 90 VA isolation requirement, this is the only unit in this comparison with a clean VA rating and factory-new condition. The listed details focus on the isolating type and VA rating rather than enclosure specifics, so it suits control-cabinet installation where the transformer itself does not need an external rated housing. At USD 279.15 it is the mid-priced item in this group.
75kVA Isolation Transformer 3 Phase - 3 Phase Step Up Step Down Industrial Power
The highest-listed-price product is also the largest: USD 1,800 for a 75kVA three-phase transformer with a 480V-to-400V designation, built by XING Laser in China. The description notes a heavy-duty steel enclosure, built-in ventilation, AC-to-AC conversion, 60 Hz operation, and a gross weight of 310 kg. It also states that maximum resistive and inductive load capacity should be limited to 65 percent of the rating, so this is not a unit to run at full nameplate draw. Choose it for industrial three-phase power conversion, and plan the electrical budget around the 65% load guidance. For anything smaller, the Noratel or ST-6358 units cover lower-voltage control work.
Final recommendation by use case
- Board-level repair or prototyping: the ST-6358 multi-pin component is the right tool at the lowest listed price.
- Industrial control panel with 230V output and terminal connection: the Noratel EFA AAA provides a panel-mount form factor with IP20 enclosure and 50/60 Hz support.
- New 90 VA isolating transformer with clean ratings: the Noratel FR78B-400230 gives you a factory-new isolating design.
- Large three-phase 480V-to-400V conversion: the XING Laser 75kVA unit handles the heavy end, with the 65% load-capacity limit factored into system sizing.
