GE Industrial 9T51B0129 Type QB 2 Winding Non-Ventilated Buck Boost Dry Type Encapsulated Transformer 120 x 240-Volt Primary 16/32-Volt Secondary 0...

Buck boost transformers are small, single-phase, dry type distribution transformers designed and shipped as insulating/isolating transformers. They have a dual voltage primary and a dual voltage secondary. These transformers can be connected for a wide range of voltage combinations. The most common use is to buck (lower) or boost (raise) the supply voltage a small amount, usually 5 - 27%. Buck boost transformers comply with NEC Article 210-9, Exception 1, when field connected as an autotransformer. GE bucking and boosting transformers provide an economical and convenient means for bucking or boosting voltage, usually no more than +/-20% on single- and three-phase circuits. They are compact, relatively light in weight, and can be easily installed for indoor or outdoor service. Buck boost transformers are employed primarily for boostingsingle-and three-phase circuits by connecting them as autotransformers. When connected as an autotransformer, only the low-voltage, high-current capacity secondary windings are required to carry the load. Because this load is only transformed over a small change in voltage, the buck boost transformer can handle loads many times its nameplate KVA rating.