Product Overview
The LN2-40.5 indoor high-voltage SF6 circuit breaker is an indoor installation for three-phase 50 Hz AC systems. It is used for protection and control in industrial and mining enterprises, power plants, and substations.
Suitable for frequent operation applications, it can also serve as a tie circuit breaker and for switching capacitor banks.
Vertical cross-section of the embedded pole showing internal vacuum interrupter.
Puffer-type arc quenching process with high-pressure SF6 gas flow.
Technical Specifications
|
No. |
Item |
Unit |
Technical Parameter |
||
|
1 |
Rated Voltage |
kV |
40.5 |
||
|
2 |
Rated Insulation Level |
Lightning Impulse Withstand Voltage (Peak) |
kV |
185 |
|
|
1-minute Power Frequency Withstand Voltage |
kV |
95 |
|||
|
3 |
Rated Current |
A |
1250,1600 |
||
|
4 |
Rated Breaking Current |
kA |
25 |
31.5 |
|
|
5 |
Rated Short-Circuit Making Current |
kA |
63 |
80 |
|
|
6 |
Rated Peak Withstand Current |
kA |
63 |
80 |
|
|
7 |
Rated Short-Time Withstand Current |
kA |
25 |
31.5 |
|
|
8 |
Rated Duration of Short-Circuit |
S |
4 |
||
|
9 |
Rated Operating Sequence |
O-0.3s-CO-180s-CO |
|||
|
10 |
Rated Capacitor Bank Breaking Current (single) |
A |
800 |
||
|
11 |
Rated Out-of-Phase Breaking Current |
kA |
6.3 |
||
|
12 |
Closing Time |
ms |
≤0.15 |
||
|
13 |
Opening Time |
Minimum |
ms |
≤0.10 |
|
|
Rated |
ms |
≤0.10 |
|||
|
Maximum |
ms |
≤0.06 |
|||
|
14 |
Number of Operations at Rated Short-Circuit Breaking Current |
times |
20 |
||
|
15 |
Mechanical Endurance |
times |
6000 |
||
|
16 |
SF6 Gas Leakage Rate (per year) |
% |
≤1 |
||
|
17 |
SF6 Gas Moisture Content |
PPm(V) |
150 |
||
|
18 |
SF6 Gas Rated Pressure (at 20°C) |
MPa |
0.65 |
||
|
19 |
Lockout Pressure (at 20°C) |
MPa |
0.59 |
||
Core Advantages
- Seamless Switchgear Integration: Compatible with GBC-40.5, JYN1-40.5, XGN17-40.5, KYN61-40.5, and KYN10-40.5 switchgear. The mechanism panel allows direct status observation and manual operation.
- High Breaking Capacity: Rated current up to 1600A. Short-circuit breaking current up to 31.5kA, making current up to 80kA (peak). Capacitor bank breaking current up to 800A for versatile scenarios.
- Reliable & Low Maintenance: Integrated mechanism and arc-extinguishing system reduces closing energy. Mechanical endurance of 6000 operations with SF6 gas leakage rate ≤1% per year.
- Harsh Environment Ready: Reinforced insulation design meets requirements for high-altitude (up to 2000m), condensation, and Class II polluted environments. Operates reliably from -25°C to +40°C.
Precision spring operating mechanism for high reliability and low closing energy.
Model and Its Meaning
LN2-40.5/1600-31.5
Sulfur hexafluoride circuit breaker
Indoor type
Design serial number
Rated voltage (kV)
Rated current (A)
Rated short-circuit breaking current (kA)
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