Air Circuit Breakers : Electronic trip relay / OCR-II : Hitachi Industrial Components & Equipment

External configuration

No	The name of knob	Mode	Setting step
1	Rated current	In	(0.4-0.5-0.6-0.7-0.8-0.9-1.0)×In Max
2	Continuous current	Ic	(0.6-0.7-0.8-0.85-0.9-0.95-1.0)×In
3	Long-time delay tripping time	LTD	15-30-60-120-240-480 sec
4	Short-time delay tripping current	Is	(2-3-4-6-8-10-OFF)×In In OCR trip operation,"STD" LED is turned 'on'
5	Short-time delay tripping time	STD	0.05-0.1-0.2-0.3-0.4-0.5 sec
6	Instantaneous-time delay trpping current	Ii	(4-6-8-10-12-16-OFF)×In In OCR trip operation,"INST" LED is turned 'on'
7	Pre-alarm current	Ip	(0.7-0.8-0.9-0.95-1.0-OFF)×Ic In OCR trip operation,"PAL" LED is turned 'on'
8	Ground fault current	Ig	(0.1-0.2-0.3-0.4-0.5-OFF)×In Max In OCR trip operation,"GTD" LED is turned 'on'
8	Ground fault current	Inp *	(0.5-1.0-OFF)×In Max
9	Ground fault time	GTD	0.1-0.3-0.8-1.5-3.0 sec

*: Inp is a function for neutral protection. It protects neutral phase in 4 pole ACB from over current.

LED	Contact	Kinds of tripping characteristics
LTD	T1—	Long-time delay tripping indicator
STD	T2—	Short-time delay tripping indicator
INST	T3	Instantaneous-time delay tripping indicator
GTD	T4	Ground fault tripping indicator
PAL	T5	Pre-alarm indicator
RUN	—	When the breaker closed(I, ON),"RUN" LED turn on and off continuously
PICK UP	—	-Over than 105% of the setting current (In) : LED turn on and off -Over than 120% of the setting current (In) : LED turn off