Description：
With the enhancement of social environmental awareness, SR-12 type compact air insulated intelligent circuit breaker cabinet which is insulated by air, does not contain greenhouse gases and solid insulating materials is the best solution.
Features:
u Adopting a forward-looking maintenance-free fixed circuit breaker solution and free combination module design provides convenient and flexible solutions for upgrading the distribution network.
u Safe and environmentally friendly, small size.
u Active personal safety design brings no danger of phase-to-phase short-circuit explosion.
u Unique fault detection system, integrated intelligent measurement and control component.
u Modular design and innovative standardized extension.
u Maintenance free for more than 25 years.
u Low carbon energy saving brings great social benefits.
Using environment:
u Temperature: Min -25℃~Max+40℃;
u Relative humidity: Daily average ≦95%; Monthly average≦90%;
u Altitude: ≦2000m;
u Shock level: Horizontal acceleration 0.4m/s2，Vertical acceleration 0.15m/s2；
u Installation location: The place with no severe impact, serious pollution and chemical corrosion, no conductive dust and explosion risk.
u For 10KV systems with no grounded and grounded through a small resistor or by arc suppression coil.
When the conditions of use exceed the above range, the user shall negotiate with us to determine the allowable range or take corresponding supplementary technical measures.
Technical Parameters:
Items | Unit | Value | ||
Rated voltage | kV | 12 | ||
Rated frequency | Hz | 50 | ||
Rated current | A | 630 | ||
Rated short-circuit breaking current | kA | 20/25 | ||
Rated short-time withstand current | kA | 20/25 | ||
Rated short-time duration | s | 4 | ||
Rated peak withstand current | kA | 50（Load switch cabinet）/63（Combined electrical cabinet） | ||
Rated short-circuit closing current | Vacuum interrupter | kA | 50/63 | |
Earthing switch |
|
| ||
Auxiliary circuit and control circuit | Rated voltage DC/AC | V | ≤400 | |
1min power frequency withstand voltage | V | 2000 | ||
Rated insulation level | Short-time power frequency withstand voltage | Open contacts | kV | 48 |
Phase to phase | kV | 42 | ||
Phase to earth | kV | 42 | ||
Lightning impulse withstand voltage | Open contacts | kV | 95 | |
Phase to phase | kV | 75 | ||
Phase to earth | kV | 75 | ||
Mechanical endurance | Circuit breaker | time | 10000 | |
Isolation/earthing switch | time | 3000 | ||
Electric endurance | Circuit breaker | grade | E2 | |
Isolation/earthing switch | grade | E2 | ||
IP grade | Cabinet shell |
| IP4X | |
Sealed box |
| IP65 | ||