Hitachi

Air Circuit Breakers [AKH, AKS, AKN Series] : Trip relay types

Classification N type A type P type S type
Current protection L / S / I /G/ Thermal
  • L / S / I /G/ Thermal
  • ZSI (Proctective coordination)
  • L / S / I /G/ Thermal (Continuous)
  • ZSI (Proctective coordination)
 P type
Other protection — Earth leakage (Option)
  • Earth leakage (Option)
  • Over / Under current
  • Over / Under frequency
  • Unbalance (Voltage / Current)
  • Reverse power
 P type
Measurement function — Current (R / S / T / N)
  • 3 Phase Voltage /Current RMS /Vector
  • Power (P, Q, S), PF (3-Phase)
  • Energy (Positive / Negative)
  • Frequency, Demand
  • 3 Phase Voltage /Current RMS /Vector
  • 3 Phase Voltage /Current RMS /Vector
  • Power (P, Q, S), PF (3-Phase)
  • Energy (Positive / Negative)
  • Frequency, Demand
  • Voltage / Current harmonics
    (1st – 63th)
  • 3 Phase Waveforms
  • THD, TDD, K-Factor
Fine adjustment — — Fine adjustment for long / short time /
delay / instantaneous / ground		 P type
Pre Trip Alarm —   Overload protection relays: DO (Alarm)
(Ground fault is not available when using Pre trip alarm)		 P type
Digital Output —
  • 3DO (Fixed)
  • L, S / I, G Alarm
  • 3DO (Programmable)
  • Trip, Alarm, Gemeral
 P type
IDMTL setting — —
  • Compliance with IEC60255-3
  • SIT, VIT, EIT, DT
 P type
Communication —
  • Modbus/ RS – 485
  • Profibus – DP
  • Modbus/ RS – 485
  • Profibus – DP
  • Modbus/ RS – 485
  • Profibus – DP
Power supply
  • Self Power
    - Power source works over 20%
    of load current.
  • Self Power
    - Power source works over 20%
    of load current.
    - External power source are
    required for comm.
  • AC/ DC 100 – 250V
  • DC 24 – 60V
  • AC/ DC 100 – 250V
  • DC 24 – 60V
  • AC/ DC 100 – 250V
  • DC 24 – 60V
Basic protection funciton (L / S / I / G)
is still under normal operation
without conrol power.
RTC timer Available Available Available Available
LED for trip info.
  • Long time delay
  • Short time delay / instantaneous
  • Ground fault
 N type N type N type
Fault recording — 10 records
(Fault / Current / Date and Time)		 256 records
(Fault / Current / Date and Time)
  • 256 records
  • Last fault wave recording (3 Phase)
Event recording — — 256 records
(Content, Status, Date)		 P type
Operating button Reset button Reset, Menu Up / Down, Left / Right, Enter A type A type