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2.5 kVA Buck-Boost Base Transformer, 120/240V × 12/24V, Single Phase
$788.25
Sanzo Power 2.5 kVA single-phase buck-boost base transformer — 120/240V × 12/24V dual windings. Resin-encapsulated, NEMA 3R, wall mount, 115°C rise, cETLus. For small voltage corrections in single- or three-phase buck-boost banks.
Ships in 5-6 weeks
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| Item | This item — Sanzo Power TX-B3-025K-124202 | Sanzo Power TX-B3-020K-124202 | Sanzo Power TX-B3-030K-124202 | Sanzo Power TX-B3-015K-124202 |
| Price | $788.25 | $647.57 | $920.00 | $500.19 |
| Availability | Ships in 5-6 weeks | ✔ In Stock: 8 | ✔ In Stock: 4 | ✔ In Stock: 10 |
| Add to Cart | Add to Cart | Add to Cart | Add to Cart | |
| Brand | Sanzo Power | Sanzo Power | Sanzo Power | Sanzo Power |
| Capacity | 2.5 kVA | 2 kVA | 3 kVA | 1.5 kVA |
| Primary Voltage | 120/240V | 120/240V | 120/240V | 120/240V |
| Secondary Voltage | 12/24V | 12/24V | 12/24V | 12/24V |
| Phase | Single Phase | Single Phase | Single Phase | Single Phase |
| Enclosure | NEMA 3R | NEMA 3R | NEMA 3R | NEMA 3R |
| Listing | cETLus Listed | cETLus Listed | cETLus Listed | cETLus Listed |
| Max Primary OCP | 30A | 25A | 35A | 20A |
| Frequency | 50/60 Hz | 50/60 Hz | 50/60 Hz | 50/60 Hz |
| Temperature Rise | 115°C | 115°C | 115°C | 115°C |
| Insulation | 180°C | 180°C | 180°C | 180°C |
| Configuration | Resin-Encapsulated | Resin-Encapsulated | Resin-Encapsulated | Resin-Encapsulated |
| Taps | None | None | None | None |
| Mount | Wall | Wall | Wall | Wall |
| Transformer Type | Buck/Boost | Buck/Boost | Buck/Boost | Buck/Boost |
Specifications
| Brand | Sanzo Power |
| Capacity | 2.5 kVA |
| Primary Voltage | 120/240V |
| Secondary Voltage | 12/24V |
| Phase | Single Phase |
| Max Primary OCP | 30A |
| Conduit Knockout | 3/4" NPT |
| Frequency | 50/60 Hz |
| Temperature Rise | 115°C |
| Insulation | 180°C |
| Configuration | Resin-Encapsulated |
| Part # | TX-B3-025K-124202 |
| Taps | None |
| Winding Material | Aluminum |
| Weatherproof Rating | NEMA 3R |
| Enclosure Material | Steel |
| Finish Color | ANSI 70 Light Grey |
| Certification Listing | cETLus |
| Transformer Type | Buck/Boost |
| Dimensions (W×H×D) | 7.68 × 12.2 × 6.38 in |
| Weight | 52 lb |
Product Description
The TX-B3-025K-124202 is a 2.5 kVA single-phase, resin-encapsulated buck-boost transformer. It has a dual 120/240V primary winding and a 12/24V low-voltage winding — these are the transformer’s windings, not a 120/240V-to-12/24V conversion. Wired as a buck-boost autotransformer, the low-voltage winding adds to or subtracts from the supply to make small voltage corrections (typically a few percent), so the unit carries only the correction portion of the load and supports a much larger connected load. It can also serve as an isolation transformer at 12/24V.
Housed in a NEMA 3R steel enclosure (ANSI 70 light grey) for indoor or outdoor mounting with 3/4" NPT conduit knockouts, aluminum windings, Class 180°C insulation, 115°C rise, 50/60 Hz, no taps, cETLus listed. Use one unit for single-phase, two (open delta) or three (wye) for three-phase buck-boost banks.