7SR5121-3AA16-0AA0Brand: SiemensMPN: 7SR5121-3AA16-0AA0Directional time-overcurrent protection 7SR51 ,5 curr. trans., 4 volt. trans., 22 BI, 12 BO, Standard interface: 1 x USB (front), RS 485 (rear) + 2 x RJ45 interRequest a quote