Air Circuit Breakers : Operating characteristics of trip relay / OCR-II

Ratings

Classification			Types and ratings of trip relays
TYPE	60Hz		LS6	LF6	LN6 *1
TYPE	50Hz		LS5	LF5	LN5 *1
Application			For industry	For industry	For industry
Possible number of ACB poles			3,4P	3,4P	3P
Operating voltage			AC/DC 110V-220V	AC/DC 110V-220V	AC/DC 110V-220V
Communication			—	—	—
Operating characteristics	Long-time delay (L)		●	●	●
	Short-time delay (S)		●	●	●
	Instantaneous time delay (I)		●	●	●
	Ground fault (G)		—	●	●
	Pre-alarm (P)		●	●	●
Steeing current(A)		In =…×In max	0.4-0.5-0.6-0.7-0.8-0.9-1.0
Continuous current(A)		Ic =…×In	0.6-0.7-0.8-0.85-0.9-0.95-1.0
Long-time delay (L) (Error tolerance : ±10%)	Trip current (A)	IL =…×Ic	1.5
Long-time delay (L) (Error tolerance : ±10%)	Trip time (sec)	LTD	15-30-60-120-240-480
Short-time dealy (S) (Error tolerance : ±15%)	Trip current (A)	Is =…×In	2-3-4-6-8-10-OFF
Short-time dealy (S) (Error tolerance : ±15%)	Trip time (sec)	STD	0.05-0.1-0.2-0.3-0.4-0.5
Instantaneous time delay (I) (Error tolerance : ±20%)	Trip current (A)	Ii =…×In	4-6-8-10-12-16-OFF
Instantaneous time delay (I) (Error tolerance : ±20%)	Trip time (sec)	INST	0.025 under *2
Ground fault (G) (Error tolerance : ±20%)	Trip current (A)	Ig =…×In Max	0.1-0.2-0.3-0.4-0.5-OFF
	Trip current (A)	Inp =…×In Max	0.5-1.0-OFF *3
	Trip time (sec)	GTD	0.1-0.3-0.5-0.7-1.0-1.5-3.0
Pre-alarm (P) (Error tolerance : ±10%)	Trip current (A)	Ip =…×Ic	0.7-0.8-0.9-0.95-1.0-OFF
Pre-alarm (P) (Error tolerance : ±10%)	Trip time (sec)	PAL =…×LTD	0.5(setting Ip 1.0), Operating time : Half of the long time inverse time

Note

*1: For type LN5 and LN6, please use Neutral CT (output : 5A)in case of using 3P ACB in 3phase 4wire circuit.
*2: In case of short circuit accident, instantaneous operation time of OCR is under 15ms.
*3: Inp is a function for neutral protection. It protects neutral phase in 4 pole ACB against over current.

operational Voltage	OCR - II
AC/DC 110-220V	5VA

OCR-II