Protection Devices

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  • 56 – Field Application Relay
  • 58 – Rectification Failure Relay
  • 59 – Overvoltage Relay
  • 60 – Voltage or Current Balance Relay
  • 64 - Ground Detector Relay
  • 64R – Restricted Earth Fault Relay
  • 67 – AC Directional Overcurrent Relay
  • 68 – Blocking or "Out-of-Step" Relay
  • 76 – DC Overcurrent Relay
  • 79 – AC Reclosing Relay
  • 81 – Frequency Relay
  • 82 – DC Reclosing Relay
  • 83 – Automatic Selective Control or Transfer Relay
  • 85 – Communications,Carrier or Pilot-Wire Relay
  • 86 – Lockout Relay
  • 87 – Differential Protective Relay
  • 91 – Voltage Directional Relay
  • 92 – Voltage and Power Directional Relay
  • 94 – Tripping or Trip-Free Relay

For the entire list of ANSI device numbers, refer to this Wikipedia page.