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S13 energy-saving transformers are made of high quality magnetic silicon steel, with traditional core lamination process and optimized design. It decreases the no-load loss by 27% in average, currently second only to the latest generation of SBH15 amorphous alloy transformers. It has a high PPR (Performance to price ratio). Products are usedin industrial and mining enterprises, residential quarters, as well as urban and rural power grids and other places.