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Skip Navigation Links Home › Support › Resources › Electrical References › Electrical Tables › Buck and Boost Transformers

Buck / Boost Transformers


Buck-Boost Transformers are small single phase isolation transformers that will reduce (Buck) or raise (Boost) line voltage when connected as an Autotransformer. The most common application is Boosting 208 to 230V. Two or three may be banked for three phase application where the neutral is available from the input. Much smaller transformers may be used in Buck-Boost applications, since the size of the transformer is roughly proportional to the change in voltage.
i.e. A 10kVA load at 240V can be increased to 264V, a 10% change can be achieved with a 1kVA transformer.

Voltage Change Table

Rating Reference Diagrams Below for Characteristics
A1 A2 B1 B2 C1 C2 D1 D2
120/240 X 12/24 1.10 0.90 1.20 0.80 1.05 0.95 1.10 0.90
120/240 X 16/32 1.13 0.87 1.27 0.77 1.07 0.93 1.13 0.87
240/480 X 24/48 1.10 0.90 1.20 0.80 1.05 0.95 1.10 0.90

Multiply Input voltage by the appropriate number in Voltage Change Table for output voltage.


Transformer Multiplier Table

Rating Reference Diagrams Below for Characteristics
A1 A2 B1 B2 C1 C2 D1 D2
120/240 X 12/24 0.10 0.11 0.20 0.24 0.05 0.05 0.10 0.11
120/240 X 16/32 0.13 0.15 0.27 0.34 0.07 0.07 0.13 0.15
240/480 X 24/48 0.10 0.11 0.20 0.24 0.05 0.05 0.10 0.11

Multiply Load by the appropriate number in Transformer Multiplier Table for approximate transformer size.



Transformer Boosting Circuit Diagram

Diagram A1: Boosting Diagram B1: Boosting Diagram C1: Boosting Diagram D1: Boosting
A1 Boosting B1 Boosting C1 Boosting D1 Boosting


Transformer Bucking Circuit Diagram

Diagram A2: Bucking Diagram B2: Bucking Diagram C2: Bucking Diagram D2: Bucking
A2 Bucking B2 Bucking C2 Bucking D2 Bucking

Warning: When using this information to perform electrical work, call a licensed electrician or consult the NEC® for safety. All licensed electricians have passed examinations covering the National Electric Code®, know state and local building codes, and may carry insurance to cover damages.

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