Buck-Boost Transformer Application Guide

This document explains the purpose, applications, and technical specifications of buck-boost transformers, which are autotransformers used to raise or lower line voltage by up to 20 percent to match equipment requirements. It covers connection types (single-phase and three-phase), differences between autotransformers and isolation transformers, overcurrent protection per NEC 450.4, and standards/approvals such as UL1446 and CSA C22.2.