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SLJ Static Synchronism Check Relay

SLJ Static Synchronism Check Relay

The Type SLJ21A is a static synchronism check relay which is designed to permit closing of a breaker only if the angle between the voltages on the line and bus sides of the breaker is less than a set angle for a set period of time. Also included are two voltage measuring circuits to check line and bus voltage conditions. The relay is mounted in a size S2 drawout case.

End of life notice: The SLJ has been discontinued as of October 1, 2013.
Read full notice.

  • Bus or line synchronism check
  • Protection and Control
  • Synchronism check operation
  • Adjustable time delay
  • Adjustable phase calibration range
  • Instantaneous undervoltage