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Tianjin Sitong Electronic Co., Ltd. is located in Tianjin, China. We are a professional manufacturer for all kinds of transformers, such as isolated transformers, encapsulated transformers, 50/60Hz transformers, power transformers, inductors and coils. Since our company was established in 2002, we have kept supplying a variety of electronic parts to many foreign importers in United States, South Korea, Russia and others. The company has passed ISO9001:2015 quality and safety management system certificate, products have CE and UL certificates. The materials have passed RoHS testing.Our workshop has automatic winding machines, automatic common mode inductor winding machines and automatic epoxy potting machines. At the same time, we have fine production process, rigorous testing methods, and all of our workers are equipped with excellent technology. Whole working processes are through quality management.Based on the policy of stringent quality, and credibility of the business, we will satisfy each customer with the perfect service and best products. We also hope to make progress together with all of friends!