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- Isolation Transformers
Product Description

The MT-BBT-208V-230V-41.67A single phase step-up Buck and Boost Transformer from Larson Electronics is powerful, reliable, and designed with the environment in mind. This transformer is designed to increase 208 volts to 230 volts, and is needed when the line-voltage is lower than the required voltage for equipment. Suitable for both indoor and outdoor applications, the MT-BBT-208V-230V-41.67A provides increased reliability, higher efficiency, protection against critical equipment failures and an extra level of protection by isolating the power source from the connected device. The lower operating costs, lower heat emissions and lower cost of ownership make this transformer ideal for a wide range of applications and businesses.
Transformer Features: The MT-BBT-208V-230V-41.67A buck and boost transformer is a single phase unit with a 9.54 kVA rating and a primary voltage of 208V AC using a maximum of 45.87 amps on the primary side. This step-up transformer has a secondary voltage of 230V and provides up to 41.67 amps available on the secondary side. Featuring robust construction, this unit`s cores are manufactured with non-aging, cold-rolled silicon steel laminations using state of the art technology.
The MT-BBT-208V-230V-41.67A is designed to increase voltage from an input voltage of 208 volts to an output voltage of 230 volts. The increase of voltage is necessary when the on-site line-voltage is consistently lower than the voltage required by the equipment being operated or installed, preserving the lifespan of the equipment and guarantees correct operation without risking damage due to incorrect voltage. This step-up transformer will allow equipment that draws up to 41.67 amps at 230V to be powered from 208V power sources. Situations for this type of transformer may include lower voltage from your electrical provider or within the existing establishment, or operating equipment that requires a lower voltage than is provided at the existing establishment.
This unit boasts a low cost of ownership and is highly energy efficient. Lower heat emissions mean less cooling is needed as well. The NEMA 3R painted steel enclosure makes the unit suitable for both indoor and outdoor applications. This step-up transformer can be either floor or wall mounted. The MT-BBT-208V-230V-41.67A features a 130°C insulation with a 80°C temperature rise.
Construction: The aluminum winding in the MT-BBT-208V-230V-41.67A are formed from high quality aluminum wire helps to improve performance. The close tolerances used during manufacturing also eliminate burrs which hinder performance. Each core is specially coated to prevent the ingress of moisture and are electrically balanced to minimize axial forces during short circuit situations. Buck and boost transformers are designed to maximize the performance and life of electrical equipment. The MT-BBT-208V-230V-41.67A is encapsulated in silica sand and resin, and cased in a NEMA 3R steel enclosure. NEMA 4, NEMA 4X, and NEMA 12 enclosures are available upon request.
Benefits: The MT-BBT-208V-230V-41.67A buck/boost step-up transformer offers many benefits to the consumer. Buck/boost transformers pass the majority of the load voltage directly through the transformer, only transforming a small percentage of the load. Due to this technology, a smaller and quieter step-up transformer is manufactured and uses less material. This provides owners with significant energy savings as well as offering environmental benefits.
Higher efficiency extends the life of the transformer and turn into cost savings for owners in the form of lower energy bills and a decrease cost of ownership when compared to large autotransformers. Installation and maintenance costs are reduced due to the smaller form factor, and less overall space requirements are decreased. In addition, these step-up transformers operate quieter than a standard autotransformer of the same capacity.
Mounting: Integrated wall mounting brackets make installation fast and easy. Because of the smaller overall footprint, heavy machinery is rarely needed for mounting and installation.
Installation: Installation is simple. Connect the primary leads and secondary leads to the step-up transformer per the provided wiring diagram. Knockout hubs on both side and the bottom of the transformer allow for easy line-in and line-out wiring. The front access cover provides convenient access to the four lead wires and four copper lugs. The MT-BBT-208V-230V-41.67A is shipped with the necessary wire nuts and lug terminals for wiring this step-up transformer in-line between line voltage and equipment.
Applications: Air conditioners, lighting systems, heating elements, motor applications and other applications that require the ability to power loads that differ from the available line voltage.
Limitations: While there are many benefits to a buck/boost transformer, there are some limitations to consider. This transformer will only transformer voltage, it will not convert phases, has no circuit isolation, and does not create a neutral for applications where a neutral is not already present. If any of these limitations apply to you, you will need a standard transformer.
Note on Phases: This buck/boost transformer is a single phase step-up transformers.
Larson Electronics is a manufacturer and as such can build stationary and portable transformer systems to your specifications. Although we carry several models of power distribution transformer systems, we can deliver custom ordered units almost as quickly as our prebuilt units. If this model does not meet your needs, please get in touch with us to discuss your specific requirements.
Electrical Specifications
Transformer Type: | Buck/Boost Step-Up Autotransformer |
Transformer Configuration: | Boost (increase) |
Phase: | Single Phase |
Frequency: | 50/60 Hz |
Input Voltage: | 208V AC |
Primary Amps: | 45.87A @ 208V |
Primary Configuration: | Two winding |
kVA: | 9.54 |
Output Voltage: | 230V AC |
Secondary Amps: | 41.67A @ 230V |
Voltage Difference: | 22V |
Voltage % Difference: | 90% |
Secondary Configuration: | Two winding |
Winding Material: | Aluminum |
Insulation: | 130°C |
Temperature Rise: | 80°C |
Ratings & Form Factor
USA Electrical Rating: | Certified to USA Standards for electrical safety (UL Standards) via a Nationally Recognized Testing Laboratory |
Canada Electrical Rating: | Certified to Canadian Standards for electrical safety (CSA Standards) via a Nationally Recognized Testing Laboratory |
Knockouts: | Side and rear |
Wiring Termination: | Front access copper tabs or lead wires |
Enclosure Material: | Painted Steel |
Finish: | ANSI 61 Grey / UL50 |
Weatherproof Rating: | NEMA 3R Rated for Indoor & Outdoor Environments (Approved for Outdoor Use) |
Sound Level: | Meets NEMA ST-20 Standards |
Mounting: | Wall mount via mounting tabs |
Dimensions: | 10.56"H x 5.88"W x 5.19"D |
Weight: | 25 lbs |
Frequently Asked Questions (FAQ) - Larson Electronics MT-BBT Series

Frequently Asked Questions (FAQ) - Larson Electronics MT-BBT Series
Q) What are Buck‐Boost Transformers and where are they used?
A) Buck-boost transformers are potted transformers with low voltage secondary windings. By field connecting the primary and secondary windings in an autotransformer configuration (not isolated), they offer an economical solution to the adjustment of line voltages that are slightly above or below normal. These transformers should be used to adjust stable voltages only.
Q) Can a Buck-Boost Transformer regulate the output voltage?
A) No. A buck-boost transformer will not regulate the voltage. If the input voltage varies, then the output voltage will also vary by the same percentage. The output (or secondary voltage) of a buck-boost transformer is dependent on the primary voltage and the transformer turns ratio. Therefore, fluctuations in the secondary voltage are direct results of any fluctuations in the primary voltage. We do offer voltage regulators.
Q) Will a Buck-Boost Transformer create a neutral on the output? My application requires a neutral.
A) No. A buck-boost transformer will not derive a neutral. If your application requires a neutral and you do not already have a neutral, you will require an isolation transformer. Neither single phase or three phase buck-boost transformers will create a neutral.
Q) Will a Buck-Boost Transformer output even voltage on both output legs?
A) No. Our standard buck-boost transformers do not generate even legs. For single phase applications, we do offer a line of buck-boost transformers that will output even legs. Three phase units will not output even legs. If you require even legs on the output voltage, we recommend purchasing an isolation transformer and not a buck-boost transformer.
Q) How does a buck‐boost transformer differ from an isolating transformer?
A) A Buck-Boost transformer is manufactured as an isolating transformer, with separate primary and secondary windings and is shipped from the factory in that configuration. When field connected for a buck-boost application, the primary and secondary windings are wired together which changes the transformer’s electrical characteristics to those of an autotransformer. The primary and secondary windings are no longer isolated as they are connected together.
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