Ningbo Zhongtong Electrical Appliance Co., Ltd ndi katswiri wothandizira pa ma relay, zolumikizira ndi zida. Idakhazikitsidwa mu 2010 ndipo idadzipereka pakufufuza, kupanga ndi kupanga zamagetsi zamagalimoto, zamagetsi zamagetsi zamagetsi zamagalimoto, ndi ma waya, zolumikizira.