Siemens 7SR1004

THE Siemens 7SR1004-4KA20-2CA0 is a microprocessor-based digital protection relay, developed for applications in medium voltage systems, such as primary cabins, substations and distribution panels. With multiple ANSI protection functions, communication via industrial protocols, and robust design, it offers high reliability and ease of integration into industrial automation systems.

Main Technical Characteristics:

• ANSI Protection Functions:

  • 50/51: Instantaneous and timed overcurrent.

  • 50N/51N: Instantaneous and timed neutral overcurrent.

  • 67/67N: Phase and neutral directional overcurrent.

  • 59: Overvoltage.

  • 59N: Neutral overvoltage.

  • 27: Undervoltage.

  • 81: Underfrequency and overfrequency.

  • 46: Current imbalance.

  • 47: Phase sequence.

  • 86: Blocking.

  • 50BF: Circuit breaker failure.

  • 98: Oscillography.