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SIPROTEC 7SJ81 - Overcurrent Protection for connection to low-power transformersControl 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 values Wp, Wg
- 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 redundancy protocols RSTP, PRP and HSR
- Ethernet interface for DIGSI 4
- USB front interface for DIGSI 4
Hardware - 4 low-power current transformer inputs
- 0/3 voltage inputs
- 3/7 binary inputs (thresholds configurable using software)
- 5/8 binary outputs (2 changeover/Form C contacts)
- 1 life contact
- Pluggable voltage terminals
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