Model decoding
V: Vacuum.
E: design serial number (Evolution)
B: Breaker.
12: Rated voltage level (kV)
Core function
Full-condition protection: interrupting rated current, overload current and maximum 50kA short-circuit current.
Fast isolation: the opening time is ≤35ms, and the fault cutting speed is 20% ahead of similar products.
Typical application
Inlet/outlet protection of 12kV distribution system, core distribution station of industrial and mining enterprises, and high-voltage side of wind power/photovoltaic box transformer (suitable for cabinets such as KYN28A-12 and XGN15-12).
Technical parameter
Parameter | Unit | Standard value range | Peak capacity |
Rated voltage (Ur) | kV | 12 | - |
Rated current (Ir) | A | 630/1250/1600/2000/2500 | 3150 (customized) |
Rated short-circuit breaking current (Isc) | kA | 20/25/31.5/40 | 50 (enhanced) |
Rated short-term withstand current (4s) | kA | = Isc | - |
Rated peak withstand current | kA | 50/63/80 | 100 |
Dielectric level | |||
Power frequency withstand voltage (1min) | kV | 42 (alternate)/ 48 (fracture) | - |
Lightning impulse withstand voltage (peak value) | kV | 75 (alternate)/ 85 (fracture) | - |
Mechanical properties | |||
Opening time | ms | ≤35 | - |
Closing time | ms | ≤75 | - |
On-off time | ms | ≤60 | - |
Mechanical life | Frequency | ≥30,000 | - |
Rated current electrical life | Frequency | ≥10,000 | - |
Full capacity breaking times (Isc=40kA) | Frequency | ≥50 | - |
Intelligent control accessory
Operating power supply: DC 48V/110V/220V or AC 220V.
Communication protocol: RS485+Modbus is standard and supports IEC 61850-8-1 (optional).
Protection interface: 4× passive contact (on/off/energy storage/fault)
Key technical requirements for operation and maintenance
Mechanical characteristics monitoring:
Warning value: brake opening speed decreases by > 15% or overtravel changes by > 2mm → trigger maintenance warning.
Periodic maintenance
3 years /5000 operations: measure the resistance of the main circuit (standard: ≤25μΩ @ 1250A).
10 years: replace vacuum interrupter (depending on wear monitoring data)
Safety interlock
Forced locking logic: it is forbidden to operate the grounding knife switch when the circuit breaker is closed (in line with GB 3906 Five Preventions).
