The frequency inverters are electrical drive components intended for instrallation in industrial plant or machines,According to the CE sign,the frequency inverters additionally fulfill the requirements of the low-voltage directive 73/23/EEC and the standards EN 50178/DIN VDE 0160 and EN 61800-2.The frequency inverters are designed according to the requirements and limit values of product standard EN 61800-3 with an interference immunity factor(EMI)for opeartion in industrial applications.