... ,ROHS,SGS,UL,KEMA,VDE,TSE,CB C.ISO9001,14001 D.manufacturer E. 430 employees,15000 square meter factory High quality ... indicator is designed for easy testing of phase sequence In three-phase systems with a permissible operating voltage up to 500V ... arrow rotates in the direction of the arrow, if the three phases are properly connected, otherwise the disc rotates in the ...