This 40.5kV circuit breaker is a core component of gas-insulated switchgear (GIS), utilizing SF6 gas for superior insulation and arc-quenching performance. Designed for medium-to-high voltage grids, it delivers fast, reliable breaking and switching operations to protect against overcurrents and short circuits.
Its compact, sealed structure minimizes footprint, resists environmental factors (dust, moisture, extreme temps), and reduces maintenance needs. Equipped with advanced mechanical interlocks and smart monitoring compatibility, it ensures safe, precise operation—critical for substations, urban power grids, and industrial facilities. Compliant with IEC 62271 and GB standards, it offers long service life and stable performance, making it a trusted choice for efficient grid management.
The main circuit is 630A-20kA (4S) and 25kA (3S), and the mechanical life is10000 times. Grounding circuit 20kA (2S),mechanical life 2000 times.
Considerations for the use of environmental conditions
The altitude is not more than 1000m, and the crack degree is not more than 8 degrees.Pollution level: ll
The environmental temperature of the product is -40 degrees ~+140 DEG C, therelative humidity is not greater than 90% per day, and the average is not more than90% per month;
The installation site of frequent and violent shock, water vapor, chemical corrosiondeposition, salt fog, dust, dirt and fire, which obviously affect the performance of themechanism, are not suitable for the installation of explosive dangerous installations.
Model composition and meaning
Main technical parameters
| Serial number |
content |
Company |
technical parameter |
| 1 |
Main circuit resistance of circuit breaker |
UΩ |
≤ 30 |
| 2 |
Super |
mm |
2-3 |
| 3 |
Open distance |
mm |
19±1 |
| 4 |
bounce |
ms |
≤ 5 |
| 5 |
Mean speed of gate separation |
m/s |
1.4-2.0 |
| 6 |
Closing average speed |
m/s |
0.8-1.2 |
| 7 |
Three phases of switching off |
ms |
≤ 2 |
| 8 |
Closing three phases |
ms |
≤ 2 |
Outline and installation dimensions of circuit breaker