Function overview

Protection functions

 • Overcurrent protection (definite-time/inverse-time/user-def.)
 • Sensitive ground-fault detection
 • Intermittent ground-fault protection
 • High-impedance restricted ground fault
 • Inrush-current detection
 • Motor protection

ü  Undercurrent monitoring
ü  Starting time supervision
ü  Restart inhibit
ü  Locked rotor
ü  Load jam protection

• Overload protection
• Temperature monitoring
• Breaker failure protection
• Negative-sequence protection
• Auto-reclosure
• Lockout

Control functions/programmable logic

• Commands for control of a circuit-breaker and of isolators
• Position of switching elements is shown on the graphic display
• Control via keyboard, binary inputs, DIGSI 4 or SCADA system
• User-defined logic with CFC (e.g. interlocking)

Monitoring functions

• Operational measured values 
• Circuit-breaker wear monitoring
• Slave pointer
• Time metering of operating hours
• Trip circuit supervision
• 8 oscillographic fault records
• Motor statistics

Communication interfaces

• System interface – IEC 60870-5-103, IEC 61850 – PROFIBUS DP – DNP 3/ DNP3 TCP/MODBUS RTU – PROFINET
• Service interface for DIGSI 4 (modem)
• Front interface for DIGSI 4
• Time synchronization via IRIG B/DCF77

Hardware

• 4 current transformers
• 3/8/11 binary inputs