Overcurrent Protection 7SJ8042-5EB00-1FB0/CC Siemens

Protection functions Time-overcurrent protection ( 50, 50N, 51, 51N) Directional time-overcurrent protection ( 67, 67N) Sensitive dir./ non-dir. ground-fault detection ( 67Ns, 50Ns) Displacement voltage ( 64) High-impedance restricted ground fault ( 87N) Inrush restraint Undercurrent monitoring ( 37) Overload protection ( 49) Under-/ overvoltage protection ( 27/ 59) Under-/ overfrequency protection ( 81O/ U) Breaker failure protection ( 50BF) Phase unbalance or negative-sequence protection ( 46) Phase-sequence monitoring ( 47) Synch-check ( 25) Auto-reclosure ( 79) Fault locator ( 21FL) Lockout ( 86) Control functions/ programmable logic Commands for the ctrl. of CB, disconnect switches ( isolators/ isolating switches) Control through keyboard, binary inputs, DIGSI 4 or SCADA system User-defined PLC logic with CFC ( e.g. interlocking) Monitoring functions Operational measured values V, I, f Energy metering valuesWp, Wq Circuit-breaker wear monitoring Minimum and maximum values Trip circuit supervision ( 74TC) Fuse failure monitor 8 oscillographic fault records Communication interfaces System/ service interface – IEC 61850 – IEC 60870-5-103 – PROFIBUS-DP – DNP 3.0 – MODBUS RTU Ethernet interface for DIGSI 4 USB front interface for DIGSI 4 Hardware 4 current transformers 0/ 3 voltage transformers 3/ 7 binary inputs ( thresholds configurable using software) 5/ 8 binary outputs ( 2 changeover/ Form C contacts) 1 live-status contact Pluggable current and voltage terminals
safety relay