250 VA Buck-Boost Base Transformer, 120/240V × 12/24V, Single Phase
by Sanzo Power · Part # TX-B2-025H-124202
4.9 out of 5 · 266 customer reviews(opens the reviews page)$203.20
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Sanzo Power 250 VA 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.
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Inventory & Inbound
TX-B2-025H-124202
0 currently in stock
- 50 more available, earliest Oct 30, 2026
Projected inbound quantities and dates are based on current purchase orders with our suppliers and are not guaranteed. We update them as suppliers confirm.
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| Product image |  |  |  |  |  |  |
|---|---|---|---|---|---|---|
| Item | This item — Sanzo Power TX-B2-025H-124202 | Acme Electric T181050 | Jefferson Electric 416-1121-000 | Hammond Power Solutions QC25ERCB | Federal Pacific K1XGF12-.250 | SolaHD HS19B250 |
| Price | $203.20 | $376.00 | $362.00 | $390.00 | $382.00 | $396.00 |
| Availability | Ships in 5-6 weeks | Ships in 10-14 weeks | Ships in 8-12 weeks | Ships in 10-14 weeks | Ships in 12-16 weeks | Ships in 12-16 weeks |
| Actions | Add to Cart | View | View | View | View | View |
| Brand | Sanzo Power | Acme Electric | Jefferson Electric | Hammond Power Solutions | Federal Pacific | SolaHD |
| Capacity | 250 VA | 0.25 | 0.25 | 0.25 | 0.25 | 0.25 |
| Primary Voltage | 120/240V | 120/240V | 120/240V | 120/240V | 120/240V | 120/240V |
| Secondary Voltage | 12/24V | 12/24V | 12/24V | 12/24V | 12/24V | 12/24V |
| Phase | Single Phase | Single-Phase | Single-Phase | Single-Phase | Single-Phase | Single-Phase |
Specifications
| Brand | Sanzo Power |
| Capacity | 0.25 kVA |
| Primary Voltage | 120/240V |
| Secondary Voltage | 12/24V |
| Phase | Single Phase |
| Max Primary OCP | 3A |
| Conduit Knockout | 1/2" NPT |
| Frequency | 50/60 Hz |
| Temperature Rise | 115°C |
| Insulation | 180°C |
| Configuration | Resin-Encapsulated |
| Part # | TX-B2-025H-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) | 4.77 × 8.07 × 3.86 in |
| Weight | 12 lb |
Product Description
The TX-B2-025H-124202 is a 250 VA 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 1/2" NPT conduit knockouts, aluminum windings, Class 180°C insulation, 115°C rise, 50/60 Hz, no taps, cETLus listed.