7SR5421-6AD16-1AA0Brand: SiemensMPN: 7SR5421-6AD16-1AA0Transformer protection (2 wdg.) 8 curr. trans., 4 volt. trans., 3 AFD (Arc Flash Detector), 37 BI, 21 BO (incl. 3 HSBO) Standard interface: 1 x USB (front), RS Request a quote