Air Circuit Breakers : Electronic trip relay / OCR-III

External configuration

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"

EX)

FAULT : R TYPE : L_INV

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

"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.

: OCR operation check port as connecting PC

: 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.

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
Pre-alarm 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)

Note