... :KEMA,CE,CCC certificate,ISO9001 Quality System; 2.DIN-rail type have patent certificate. 3.Multi-rate:two tariff DEM031 ... convenient installation, etc.Functions and features:1.35mm standard DIN rail installation, complying with standard DIN EN50022. Or front board installed ... voltage 150-400 Vac, set up tariff F2, the tariff conversion is controlled by timer outside or similar equipment.4.May ...