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Hitachi Industrial Components & Equipment

External configuration

External configuration

1 : Display LCD

  • Display of normal condition: In use current of R, S, T, N phases
  • Fault display: Fault phases and kinds of fault
    -Long-time delay trip: L_INV
    -Short-time delay trip: S_INV
    -Instantaneous-time delay trip: INST
    -Ground fault trip: GND →LCD reset method: Press "Func" button after "Ent"



→ Long-time delay trip occurring in"R" phase

2 : Condition display LED : "Run"

  • The LED blinks with normal operation of OCR.

3 : Over-current display LED

  • "pick-up"LED : when over default pre-alarm current flows the "pick-up" LED warning blinks and it is turned off after OCR operation.
  • "Fault" LED : The OCR operation of generating fault turns on "Fault" LED.

4 : Communication display LED : "Rx, Tx"

  • Blinks with normal communication of OCR.

5 : Reset button

  • Out-put contact signal reset and OCR over-current display LED.

6 : Selection button

  • Func : Mode selection button
  • Ent : Selection button of various set-up value
  • input button,input button : Set-up value input button

7 : RS232 port

: OCR operation check port as connecting PC

8 : TEST Port

: Connection button with OCR tester (OT-2000)

It is tested by IEC standard 61000-4-3 for mobile checking function and certified class"A" of frequency range from 80MHz to 2.4GHz.

Setting step

Operating characteristics Mode Setting step
Rated current In 0.2-0.3-0.4-0.5-0.6-0.7-0.8-0.9-1.0(9 steps)×In max.-Industry
(0.2-0.3-0.4-0.5-0.6-0.7-0.8-0.9-1.0)×In max.-Generator protection
Continuous current Ic 0.6-0.65-0.7-0.75-0.8-0.85-0.9-1.0-no
Long-time delay
tripping time
LTD 15-20-25-30 … 465-470-475-480sec(Step : 5sec) - Industry
1.5-2.0-2.5 … 47.0-47.5-48.0sec(Step : 0.5sec) - Generator protection
Short-time delay
tripping current
Is (2-3-4-5-6-7-8-9-10-no)×In
Short-time delay STD 0.05-0.06-0.07 … 0.48-0.49-0.5sec(Step: 0.01sec)
Tripping time
Instantaneous-time delay
Iinst (4-5-6-7-8-9-10-11-12-13-14-15-16-no)×In -4000AF under
(4-5-6-7-8-9-10-11-12-no)×In -5000AF over
Tripping current Ip (0.7-0.8-0.9-1.0)×Ic
Ground fault current
Neutral protection
Ig Ig: (0.2-0.3-0.4-0.5-0.6-0.7-0.8-0.9-1.0-no)
Inp: (0.5-0.6-0.7-0.8-0.9-1.0-no)
Ground fault time GTD 0.1-0.2-0.3 … 2.8-2.9-3.0sec(Step: 0.1sec)

Formation of output terminal

Type of contact Mark of contact
Control power Common R+("+")
AC/DC 100-220V R2-("-")
DC24, DC48V
(Holding type contact)
AL1+, AL1-
AL2+, AL2-
Tripping Type Common T0
Time(Long, Short) T2-
Instantaneous trip T3
Ground tirp T4
Pre-alarm T5
Communication 485+,485-


Only AC power can be used for input power to OCR-II

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