Siemens Siprotec 4 SIPROTEC 7SA61 Protection Relay – 4xI 4xV, text display, 1-/3-pole tripping

Protection Functions: ، Distance protection with 6 measuring systems (21/21N) ، High resistance earth-fault protection (50N, 51N, 67N) ، Earth-fault detection in isolated and resonant-earthed systems ، Tele (pilot) protection (85) ، Fault locator (FL) ، Power swing detection/tripping (68/68T) ، Phase-overcurrent protection (50/51) ، Switch-onto-fault protection (50HS) ، STUB bus overcurrent protection (50STUB) ، Overvoltage/undervoltage protection (59/27) ، Over/underfrequency protection (81O/U) ، Auto-reclosure (79) ، Synchro-check (25) ، Breaker failure protection (50BF) ، Thermal overload protection (49) ، Control Functions: ، Commands for circuit breaker and isolator control ، Monitoring Functions: ، Trip circuit supervision (74TC) ، Relay self-supervision ، Measured-value supervision ، Event logging and fault logging ، Oscillographic fault recording ، Switching statistics ، Additional Features: ، 4xI, 4xV inputs ، Text display ، 1-/3-pole tripping ، Compatible with DIGSI 4 engineering software