نقدم لكم سلسلة شرح الـ SIEMENS RELAYS للمهندس المتميّز Mohamed Rashad .. ومحتوياتها:

01- How to Communicate?
02- Measurements, BI,BO and LED Test.
03- Over Current and Earth Fault.
04- Breaker Failure.
05- Under/Over Voltage.
06- SIGRA Fault Recorder.
07- Trip Log & Fault Recorder.