This circuit breaker is used for control and protection of 72.5 to 145kV power systems.
It uses SF6 gas insulation (if working place is high cold region, arc exhaust medium is mixture of SF4 and CF4), as a self-energy arc suppression principle and a reliable spring operating mechanism, which provides the breaker with high breaking capacity，low operating power and high reliability.
The circuit breaker is available in single-phase and three-phase designs, following IEC 62271-100 Standard.

TECHNICAL DATA
No	Item		Unit	Parameter
1	Rated voltage		kV	72.5/126/145
2	Rated lightning impulse withstand voltage	to earth		160/230/275
		across open pole		200/265/275
3	Rated lightning impulse withstand voltage	to earth		350/550/650
		across open pole		410/630/650
4	The power frequency withstand voltage when gas SF6 is zero pressure（5min）			80/95/10
5	Rated frequency		Hz	50
6	Rated continuous current		A	2000、3150
7	First pole to clear factor			1.5
8	Rated short circuit breaking current		kA	40
9	Rated short circuit making current			100
10	Rated short time withstand current			40
11	Rated peak withstand current			100
12	Rated short circuit continuous time		s	4
13	Rated out of synchronism breaking current		kA	10
14	Short line fault breaking current			36，30
15	Rated line charge breaking current		A	10/31.5/50
16	Rated operating sequence		A	O-0.3s-CO-180s-CO
17	Switch off time		ms	30±3
18	Switch on time			75±8
19	On-off time			45～60
20	Main loop resistance		μΩ	≤40
21	Rated gas SF6 pressure (20℃ meter’s pressure)		MPa	≤0.6/0.5(normal/high cold region /extreme cold area)
22	Alarm/closedown pressure（20℃ meter pressure)			0.55/0.47、0.50/0.45
23	Gas SF6 leak annual		%	≤ 0.5
24	Moisture content of gas		ppm(v)	≤150
25	Mechanical life		times	10,000
26	Wireless interfere level		μV	≤500
27	Creepage distance	Between fracture	mm	1813/3150/3906、2248/3625/4495
		To ground		≤1813/3150/3906、2248/3625/4495
28	Gas SF6 weight of each circuit breaker		kg	06/08/2010

Main technical parameter of mechanism
No	Item		Unit	Parameter
1	Auxiliary loop voltage		V	DC220/110
2	Rated operating voltage of switch on coil and switch off coil			DC220/110
3	Rated operating current of switch on coil and switch off coil		A	2/2、5.8/3.3
4	Energy store motor	Rated voltage	V	AC/DC220/110
		Voltage range of normal operation		65%~110%
		Power	W	600
5	Energy store time of motor		s	≤15
6	Manual energy store moment		N·m	≤30
7	Loop voltage of heater and lighting		V	AC 220
7	Rated voltage of auxiliary switch			DC 220
9	Rated current of auxiliary switch		A	10
10	Connection point pairs of auxiliary switch			20