EI-54 Encapsulated PCB Mount Transformer with 230V AC Voltage, EE, EI and UI Cores Voltage: 230V AC Series: EE20, EI28, EI30, EI35, EI38, EI42 ... telecom transformer Encapsulated audio transformer Encapsulated modem transformer Encapsulated high-voltage transformer EI-54 Encapsulated transformer