In 1987, Cixi Wanji Electric Appliance Co., Ltd was established focusing on manufacturing toroidal iron core and toroidal transformer.

In 1997, Wanji was upgraded to Ningbo Wanji Electronics Science & Technology Co., Ltd. After 10 years of development, our new factory was founded, "Jishisheng" brand was awarded as "Ningbo Famous Brand" and “High-Tech Product of Zhejiang Province”. Wanji became one of the leading toroidal transformer suppliers in China then.

In 1999, Wanji passed ISO9002:1994 Quality Management System. We set up an Imp. & Exp. Dept., and succeeded in entering American and European markets.

In 2001, we started to design and manufacture EI power transformer and formed complete power transformer line.

In 2004, Wanji developed High Efficient Toroidal Transformer for Wind Energy Industry and exported to American Markets to become one of the earliest enterprises entering new energy industry in China. We also passed UL structure and UL Insulation System approvals.

In 2006, Wanji developed Toroidal Transformer for Solar Power Industry. From then all materials we used for power components are RoHS compliant;

In 2007,Wanji built a subsidiary company--Ningbo Zuoao Electronics Science & Technology Co., Ltd to supply with PCBA for Home Appliances and Equipments.

In 2008, Wanji was authorized with ISO14001:2004 Environment Management System.

In 2010, Wanji is serving global customers from various industries with reliable strategic relationships. We are strengthening the abilities of R&D and customization, aggressively moving forward to new energy areas.