LN2-40.5 Indoor SF6 Circuit Breaker High Voltage Reliable Durable Electrical Protection for Switchgear Substation

The LN2-40.5 Indoor SF6 Circuit Breaker offers high voltage electrical protection for switchgear and substations. Designed for reliability and durability, it ensures efficient circuit interruption under high stress. With SF6 gas insulation, it maintains excellent performance in demanding environments, providing safe and stable electrical protection for critical infrastructure.

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The LN2-40.5 indoor SF6 circuit breaker is an indoor device designed for use in 50 Hz three-phase AC systems. It is suitable for industrial enterprises, power plants, and substations for protection and control purposes and can be used in locations requiring frequent operations. It can also be used as a link circuit breaker and for switching capacitor banks.

The LN2-40.5 model is equipped with the CT10-A spring operating mechanism but can also be paired with the CD101G electromagnetic operating mechanism.

Main Technical Parameters of Circuit Breaker

(Model: LN2-40.5/1250A-25)

No.	Parameter Name	Unit	Parameter Value
1	Rated voltage	kV	40.5
2	Maximum working voltage	kV	40.5
3	Rated insulation level	kV	185 (lightning impulse, full wave) / 95 (power frequency, 1 min)
4	Rated frequency	Hz	50
5	Rated current	A	1250
6	Rated short-circuit breaking current	kA	25
7	Rated operating sequence	–	O—0.35s—CO—180s—CO*
8	Rated short-circuit making current (peak)	kA	63
9	Rated dynamic stability current (peak)	kA	63
10	Rated thermal stability current	kA	25
11	Rated thermal stability duration	s	4
12	Switching current for a single capacitor bank	A	400
13	Rated out-of-step breaking current	kA	6.3
14	Accumulated breaking times (rated current)	Times	2000
15	Accumulated breaking times (rated short-circuit)	Times	16
16	Mechanical life
	– With CT10-A spring mechanism	Times	6000
	– With CD10IIG electromagnetic mechanism	Times	5000
17	Closing time
	– Spring mechanism	s	≤0.15
	– Electromagnetic mechanism	s	≤0.2
18	Inherent opening time (rated voltage)
	– Minimum operating voltage	s	≤0.10
	– Maximum operating voltage	s	≤0.07
19	SF6 gas rated pressure (20℃ gauge)	MPa	0.65
20	SF6 gas alarm pressure (20℃ gauge)	MPa	0.42
21	SF6 gas lock pressure (20℃ gauge)	MPa	0.4
22	SF6 gas annual leakage rate	%/Year	≤1
23	SF6 gas moisture content	ppm (V/V)	≤150
24	Rated operating voltage (CT10-A spring mechanism)
	– Closing coil	V (DC)	48, 110, 220
	– Opening coil	V (DC)	48, 110, 220
	– Motor	V (DC)	110, 220
25	Rated operating voltage (CD10IIG electromagnetic mechanism)
	– Closing coil	V (DC)	110, 220
	– Opening coil	V (DC)	48, 110, 220
26	Weight
	– Circuit breaker body	kg	135
	– SF6 gas	kg	1.5