ADR131A – Non Communicable 2 OC + 1 EF

Numerical Communicable over current Protection Relay

General Description

The ADR131A is a three element numerical relay can having following option , 2 OC +1 EF or 3EF relay with Instantaneous high set and programmable output to simplify feeder protection wiring.

ANSI Protection Functions
50 Instantaneous Over current Protection (OC-Inst.)
50N Instantaneous Earth Fault Protection (EF-Inst.)
51 Time Over current Protection (Phase) (OC-IDMT.)
51N Time Over current Protection (Earth) (EF-IDMT.)

Model Functional Details Cabinet Style
ADR131A-AM10101 Non Communicable Numerical 2 OC + 1EF Relay. CSA-150
ADR131A-AM10201 Non Communicable Numerical 3 OC Relay. CSA-150
ADR131A-AM10301 Non Communicable Numerical 3 EF Relay. CSA-150

Numerical Communicable OC/EF Protection Relay : ADR131A


  • 3 Element (2 Phase + EF / 3 Phase / 3EF ) over current IDMT with instant trip.
  • Display of fault current. / Load current.
  • Selection of Curve: Six selectable curves (Normal Inverse1 (C1), Normal Inverse2 (C2), Very Inverse (C3), Extremely Inverse (C4), Long Time Inverse (C5) & Definite Time (C6).
  • Separate curve selection for phase and EF.
  • Latching of fault current up-to last 5 fault.
  • Site selectable CT secondary
  • Programmable Annunciation Contact
  • Trip circuit supervision function.
  • Breaker Fail.