File:37.5kVA three phase utility stepdown.jpg - Wikimedia Commons
Transformer Purchase Guide for 110v 220v Voltage Converter Transformer – Voltage Converter Transformers
ELC T Series 1500 Watt Voltage Converter Transformer - Step Up/Down - 110v to 220v / 220v to 110v Power Converter - Circuit Breaker Protection, CE Certified [3-Years Warranty]
Yinleader 500W Voltage Transformer Power Converter(220V to 110V, 110V to 220V) Step Up/Down Converter 110/120 Volt - 220/240 Volt