Todd Systems 500W Step Down Transformer. Transformers shut off when overheated from wattage overload, and automatically reset themselves when cooLED — no fuses needed. Use step-down transformers when connecting 110/120 VAC equipment to 220/240 VAC power sources. Transformers offer a blue baked enamel finish and are fully rated at 50/60 Hz. Each transformer features a US three wire grounding receptacle for instrumentation plug-in. Representative Photo only.