1-Phase Buck/Boost Step-Up Transformer (208V to 229V)
Quick take
This single-phase buck/boost step-up transformer is designed to raise 208V AC to 229V AC for equipment that requires that voltage level, offering an economical way to correct line voltage that is slightly low. It is meant for stable voltage matching, not voltage regulation, and it does not create a neutral on the output.
Pros and cons
Pros
- Single-phase buck/boost design intended to step up 208V primary to a 229V secondary.
- Supports demanding loads for its size class, with primary and secondary current ratings specified for 50/60 Hz use.
- Indoor/outdoor use is supported via a NEMA 3R enclosure rating.
- Designed for U.S. and Canada with UL listed and CSA certified ratings.
Cons
- No voltage regulation: if input voltage fluctuates, output voltage will vary with it.
- Does not derive a neutral on the output, which can be a deal-breaker for some single-phase wiring needs.
- Buck-boost style outputs are not intended to provide “even legs” for applications that require them.
- Not a fit for neutral/isolation requirements where an isolation transformer is the better match.
What buyers think
Buyer-review evidence for this specific model is extremely limited, so it is not possible to identify reliable recurring themes around performance, reliability, noise, installation experience, or overall value. For a purchase like this, the most important decision inputs are the electrical fit (voltage, current, and wiring requirements) and whether you truly need a buck-boost solution versus an isolation transformer.
What this transformer is for
This transformer’s job is straightforward: convert an existing 208V AC supply to a 229V AC output using a buck/boost step-up approach. That makes it most useful when the available line voltage is consistently a bit below what connected equipment requires.
Key electrical targets include:
- Input (primary): 208V AC, single phase
- Output (secondary): 229V AC
- Frequency: 50/60 Hz
- Power level: 7.15 kVA rating
Key specifications that matter for compatibility
Before buying, confirm your load requirements and line conditions against the transformer’s ratings.
Current capacity
- Primary side current rating is specified at 34.4A @ 208V.
- Secondary side current capacity is specified at 31.2A @ 229V.
Enclosure and installation style
- NEMA 3R indoor/outdoor enclosure rating for outdoor exposure protection (where applicable to your installation).
- Integrated wall mounting brackets are intended to support straightforward installation.
- Size and weight are compact enough for many panel-adjacent placements, but this is still a heavier unit (18 lbs is listed for one set of product details; other product data lists a higher weight). Plan for handling accordingly.
Insulation temperature details
- Insulation temperature rating and temperature rise are specified (130°C insulation, 80°C temperature rise). This is relevant for applications where ambient conditions or heat buildup could be a concern.
Buck-boost basics, and the limitations to respect
It adjusts voltage for matching, not regulation
This buck/boost transformer is intended to correct a relatively stable voltage offset. It does not function as a voltage regulator. If your input voltage changes over time, expect the output voltage to change as well.
It does not create a neutral
If your application needs a neutral on the output, a buck-boost transformer like this is not the right solution. Buck-boost designs do not derive a neutral when one is not already present in the wiring approach. For neutral-dependent loads, you will likely need an alternative transformer strategy that provides the neutral you require.
Even-leg output expectations
For applications that require output “even legs,” standard buck-boost units are generally not intended to produce that result. If even-leg output is a requirement in your system design, you will want to choose a transformer type that explicitly supports it.
Pros and cons for real buyer fit
Best for
- Single-phase setups where 208V supply is consistently available and equipment requires 229V.
- Applications where you want a compact step-up solution for a modest voltage difference, rather than moving to a full regulation system.
- Installations where the environment allows for NEMA 3R protection, including certain indoor/outdoor locations.
Who should avoid it
- Buyers who need voltage regulation to maintain a constant output despite fluctuating input.
- Buyers whose system design requires a neutral on the output that this type will not provide.
- Buyers who need specific multi-leg output characteristics that buck-boost standard configurations are not intended to deliver.
Is it worth it? A practical verdict
This transformer can be a strong, cost-conscious fit when your problem is simply that your line voltage is slightly low relative to equipment requirements. The value hinges on one thing: you must already have a stable supply situation and your wiring requirements must match what a buck/boost solution can provide (including the neutral and output-leg implications).
If you need regulated output voltage stability or neutral behavior on the output, you should look at alternatives in the transformer category that match those specific electrical requirements more directly.
Alternatives to consider (by what you actually need)
- Voltage regulators: choose these if your input voltage varies and you need output stability rather than a fixed turns-ratio correction.
- Isolation transformers: choose these when your application requires isolation or neutral-related output behavior that buck-boost designs do not provide.
Price and availability
Price varies by seller and is subject to change. If you want the latest listing details, check availability and current pricing here.
FAQ
Does this transformer regulate voltage?
No. A buck-boost transformer is not designed to regulate output voltage. If input voltage varies, output voltage varies accordingly.
Will it produce a neutral on the output?
No. This type of buck-boost transformer does not derive a neutral. If your application requires a neutral and you do not already have one in the system design, you will need a different transformer approach.
What does “buck/boost” mean in practice here?
It refers to the ability to correct line voltage using an autotransformer-style configuration, stepping up from 208V AC to 229V AC in this case. It is intended for stable voltage matching rather than active regulation.
Is it suitable for indoor and outdoor use?
Yes. The unit is rated for NEMA 3R enclosure use, which is commonly associated with protection for outdoor environments where exposed conditions are possible.
What kind of load can it support?
It is rated for 7.15 kVA with specified current capacity on both primary and secondary sides, intended to power equipment that draws within those limits at the 229V output.
Specifications
| Product Title | 1-Phase Buck/Boost Step-Up Transformer - 208V Primary - 229V Secondary -31.2, 41.7 or 62.5 Amps -50/60Hz |
|---|---|
| Category | Electronics > Power Accessories > Isolation Transformers |
| Brand | Larson Electronics |
| Manufacturer | Larson Electronics LLC |
| Item Weight | 24 Pounds |
| Brand Name | Larson Electronics |
| Model | 147872 |
| Part Number | 147872 |
| Current Rating | 34.4 Amps |
| Maximum Frequency | 60 Hz |
| Minimum Frequency | 50 Hz |
| Number of Items | 1 |
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