رله حفاظتی زیمنس مدل 7SA641.-…..-3DD6

DISTANCE PROTECTION RELAY 7SA64 UNITS WITH DETACHED OPERATOR UNIT, BACK-LIT GRAPHIC DISPLAY FOR SINGLE-LINE DIAGRAM, CONTROL KEYS, KEY-OPERATED SWITCH, FUNCTION KEYS, NUMERICAL KEYS PC-INTERFACE, TRIPPING 3-POLE PICKUP I>, PICKUP V</I>/ PICKUP Z<(POLYGON),V</I>/PHI BREAKER-FAILURE PROTECTION, VOLTAGE PROTECTION, EARTH-FAULT PROT. DIRECTIONAL FOR EARTHED NETWORKS EARTH-FAULT DETECTION FOR COMPENSATED/ISOLATED NETWORKS OVERLOAD PROTECTION