Siemens 7SR1151

THE Siemens 7SR1151 is a microprocessor-based digital protection relay, developed for applications in medium voltage systems, such as feeders and transformers. With multiple protection functions, communication via IEC 61850 Ethernet and robust design, it offers high reliability and ease of integration into industrial automation systems.

Main Technical Characteristics:

• Protection Functions:

  • Directional time overcurrent (ANSI 67)

  • Instantaneous overcurrent (ANSI 50)

  • Neutral overcurrent (ANSI 51N)

  • Undervoltage (ANSI 27)

  • Overvoltage (ANSI 59)

  • Underfrequency (ANSI 81)

  • Circuit Breaker Failure (ANSI 50BF)

  • Circuit breaker monitoring