... speification of transformers is as below: Type standard Input voltage Output voltageFrequencyTC-100W220V<----------->110V50Hz-60HzTC-200WTC-300WTC-500WTC-750WTC-1000WTC-1500W220V ... :Efficacy: fast starting, quick response, fully protection, high precision output voltageApplication: Computers, Duplication, ILLumination system, Medical instrument Refrigerator,Safety warning equipment, Program ...