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PCS-921S Breaker Failure Relay
  • PCS-921S breaker failure relay integrates various protection functions, which is designed for the single- or three-pole circuit breaker on all voltage levels and provides comprehensive protection and control solutions. With its flexibility and the powerful PCS-Studio configuration tool, PCS-921S offers future-oriented system solutions with high investment security and low operating costs.


  • Protection and Control Supervision Recording Measurement Synchrophasor measurement Communication protocol Communication interface
    • Six stages phase overcurrent protection (67P, 50/51P)

    • Six stages earth-fault protection (67G, 50/51G)

    • Two stages negative-sequence overcurrent protection (67Q, 50/51Q)

    • Two stages phase undervoltage protection (27P)

    • Two stages phase overvoltage protection (59P)

    • Two stages negative-sequence overvoltage protection (59Q)

    • Two stages residual overvoltage protection (59G)

    • Four stages overfrequency protection (81O)

    • Four stages underfrequency protection (81U)

    • Four stages frequency rate-of-change protection (81R)

    • One stage undercurrent protection (37)

    • Breaker failure protection (50BF)

    • Dead zone protection (50DZ)

    • Pole discrepancy protection (62PD)

    • Auto-reclosing (79)

    • Switchgear control

    • Synchronism Check (25)

    • Voltage selection

    • Voltage and current drift auto adjustment


    • CT circuit failure supervision

    • VT circuit failure supervision

    • Trip/Close coil supervision

    • Self-diagnostic

    • DC power supply supervision

    • System frequency supervision


    • Event Recorder including 1024 disturbance records, 1024 binary events, 1024 supervision events, 256 control logs and 1024 device logs.

    • 64 disturbance waveforms records (The file format of disturbance recorder is compatible with international COMTRADE file.)

    • 64 high-frequency waveforms records (The file format of disturbance recorder is compatible with international COMTRADE file.)


    • Current and voltage measurement at a 2.4KHz sampling rate

    • Current and voltage measurement at a 9.6KHz sampling rate

    • Energy metering (active and reactive energy are calculated in import respectively export direction)

    • Power (Apparent/Real/Reactive)

    • Power factor

    • Frequency


    • Synchronize with the GPS time by IRIG-B time source

    • Calculate synchronized phasors, including: Ua, Ub, Uc, U1, U2, U0, Ia, Ib, Ic, I1, I2, I0

    • Calculate analog values, including: active power (P), reactive power (Q), frequency, ROCOF (df/dt)

    • Transmit binary status of the IED to PDC (Phasor Data Concentrator) according to IEEE C37.118 standard

    • Realize high accurate measurement of the phasors and analogs according to the IEEE C37.118.1-2011 and IEEE C37.118.1a-2014 standard.

    • Communicate with PDC according to IEEE C37.118-2005 and IEEE C37.118.2-2011


    • IEC 61850 Editions 1 and 2

    • IEC 60870-5-103

    • DNP3.0

    • Modbus

    • IEC 62439 Parallel Redundancy Protocol (PRP)

    • IEC 62439 High-availability Seamless Redundancy (HSR)

    • IEEE 802.1w Rapid Spanning Tree Protocol (RSTP)


    • 2 or 4 100Base-TX copper Ethernet ports for SCADA communication

    • 2 or 4 100Base-FX optical Ethernet ports for SCADA communication

    • 2 RS-485 serial ports for SCADA communication

    • Extendable 1000Base-SX optical Ethernet port for PRP and HSR

    • 1 RS-485 serial port for clock synchronization

    • 1 TTL serial port for clock synchronization

    • 1 BNC port for clock synchronization

    • 1 optical fiber port (ST-connector) for clock synchronization

    • 1 front RJ-45 port for debugging

    • 1 rear RJ-45 port for debugging


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