Choosing between a compact 240VA control-circuit transformer and a 30kVA industrial three-phase unit is not really about which is better overall - it's about matching the transformer to the voltage-regulation job at hand. Both the Nunome Electric NES240TUV and the Sheng Yu 30kVA isolation transformer solve voltage-isolation needs, but at opposite ends of the size, price, and power spectrum. Here's how to decide.
Quick verdict: If your load is a single-phase control panel or small machinery, the Nunome NES240TUV at $152 gives you a compact 240VA dry-type isolation transformer with selectable primary taps for 200/220/230/240 VAC and a 22/24 VAC secondary. If you need three-phase isolation for industrial machinery, labs, or sensitive distribution systems, the Sheng Yu 30kVA unit at $3462.89 is a new, unused transformer with an integrated Schaffner EMC filter, rated for 30kVA, 450V primary, and 40A primary current. The right choice depends entirely on your voltage and capacity demands.
| Feature | Nunome NES240TUV | Sheng Yu 30kVA |
|---|---|---|
| Listed price | USD 152.00 | USD 3,462.89 |
| Price bar | ||
| Condition | Used | New |
| Phase | Single-phase | 3-phase |
| Capacity | 240 VA | 30 kVA |
| Primary voltage | 200/220/230/240 VAC | 450 V |
Where each product wins:
- Nunome NES240TUV wins on lower listed price, compact single-phase footprint, and multi-tap primary voltage flexibility for control circuits.
- Sheng Yu 30kVA wins on massive capacity, three-phase input, new condition, and the integrated Schaffner EMC filter for clean industrial power.
Nunome Electric NES240TUV Single-Phase Dry Isolation Transformer 240VA
This used, single-phase dry-type transformer from Nunome Electric is rated at 240VA and offers selectable primary voltages of 200, 220, 230, or 240 VAC, with a secondary of 22 or 24 VAC at 50/60 Hz. It measures just 8 x 8 x 8 inches and weighs 18 pounds, making it a tidy fit inside control panel enclosures. The main reason to pick it is the combination of a very modest listed price and the ability to tap different primary voltages without reconfiguring the whole system. The limitation is its small capacity: 240VA will only handle light control loads, and the used condition means you're buying pre-owned gear. It's also strictly single-phase, so it cannot serve three-phase equipment.
30kVA Isolation Transformer | 3-Phase Industrial Power Converter | New in BOX
This Sheng Yu unit is a brand-new, unused three-phase isolation transformer delivering 30kVA of capacity with a 450V primary and 40A primary current. It includes an integrated Schaffner FN3270H-55-34 industrial EMC filter, and its metal housing features integrated wheels for easier handling in an industrial setting. The reason to choose it is the scale and noise protection it provides: 30kVA of three-phase isolation with active filtering is well suited to industrial machinery, laboratories, or sensitive electrical distribution. The trade-off is the much higher listed price and the fact that 30kVA three-phase is far more than a small single-phase control circuit needs. Make sure your site can support 450V three-phase input before committing.
Final choice by use case:
- Choose the Nunome NES240TUV if you need a small, lower-priced, single-phase isolation transformer for control circuits, with flexible primary taps and a 22/24 VAC secondary. It's a used unit but priced accordingly.
- Choose the Sheng Yu 30kVA if you need a new, high-capacity three-phase isolation transformer with built-in EMI filtering for heavy industrial loads or sensitive electronic systems.
