• Compact Numerical relay
  • 27/59 Under/Over Voltage
  • 47 Negative Phase Sequence Voltage
  • 59N Neutral Voltage Displacement
  • 81Under/Over Frequency
  • Integrated programmable logic


Optional Loss of mains functionality

  • 78 Vector Shift
  • 81R Rate-of-Change-of-Frequency (df/dt or Rocof)

The 7SR158 is a voltage and frequency protection relay developed to enhance the Argus family of products by providing a familiar device using the latest generation of hardware technology.

Suitable for loss of mains applications in distributed generation installations.