Multifunction protection

Overcurrent and motor protection – SIPROTEC 7SJ63

SIPROTEC 7SJ63 (phase-out product)

The SIPROTEC 7SJ63 can be used as a protective control and monitoring relay for distribution feeders and transmission lines of any voltage in networks that are earthed (grounded), low-resistance earthed, unearthed, or of a compensated neutral point structure. The relay is suited for networks that are radial or looped, and for lines with single or multi-terminal feeds. Regarding the time-overcurrent/directional timeovercurrent protection the characteristics can be either definite time, inverse time or user-defined.The SIPROTEC 7SJ63 is equipped with motor protection applicable for asynchronous machines of all sizes. Motor protection comprises undercurrent monitoring, starting time supervision, restart inhibit, locked rotor.

Successive product


Features & functions

Multifunction protection SIPROTEC 7SJ63


The relay provides easy-to-use local control and automation functions. The number of controllable switchgear depends only on the number of available inputs and outputs. The integrated programmable logic (CFC) allows the user to implement their own functions, e.g. for the automation of switchgear (interlocking). The user is able to generate userdefined messages as well.


The flexible communication interfaces are open for modern communication architectures with control systems.



  • 4 current transformers

  • 3 voltage transformers

  • 11 to 37 binary inputs

  • 8 to 14 output relays

  • Graphical display
  • Surface-mounting or flush-mounting housing

Communication interfaces

  • System port 
    – IEC 61850

    – IEC 60870-5-103 
    – DNP 3.0


  • Service port

    – DIGSI 4

    – Modem

    – Thermobox

  • Front port

    – DIGSI 4

  • Time synchronization via IRIG B/DCF77


Protection functions

  • Overcurrent protection (definite-time/inverse-time/user-def.)

  • Directional overcurrent protection (definite-time/inverse-time/user-def.)

  • Sensitive dir./non-dir. earth-fault detection

  • Displacement voltage

  • Intermittent earth-fault protection

  • High-impedance restricted earth fault

  • Inrush restraint

  • Motor protection

  • Overload protection

  • Temperature monitoring

  • Under-/overvoltage protection

  • Under-/overfrequency protection

  • Breaker failure protection

  • Negative-sequence protection

  • Phase-sequence monitoring

  • Auto-reclosure

  • Fault locator

  • Lockout

Control functions/programmable logic

  • Flexible number of switching devices

  • Position of switching elements is shown on the graphic display

  • Local/remote switching via keyoperated switch

  • Control via keyboard, binary inputs, DIGSI 4 or SCADA system

  • Extended User-defined logic with CFC (e.g. interlocking)

Monitoring functions

  • Operational measured values V, I, f,...

  • Energy metering values Wp,Wq

  • Circuit-breaker wear monitoring

  • Slave pointer

  • Trip circuit supervision

  • Fuse failure monitor

  • 8 oscillographic fault records


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