7SR5111-4AD26-0AA0 - Siemens
Directional time-overcurrent protection 7SR51 4 curr. trans., 4 volt. trans., 24 BI, 17 BO (incl. 3HSBO), 3 AFD (Arc Flash Detector), Standard interface: 1 x USB (front), RS485 (rear) + 2 x optical LC-interfaces, S12 enclosure