1.changeover switch 2.professional manufacture 3.patent products 1.SGW Changeover switch(switch), 2.CE approval, 3.export experience for 10 yearsSGW Changeover switch(switch)accords to international electric standard: IEC947-3, IEC947-5,Chinese standard: GB14048.3, GB5226.1,European standard: EN60947-1, EN60947-3, EN60947-5 and EN60204-1.