TD-12/1250A High-Voltage Vacuum Interrupter, Vacuum Tube for 10KV Circuit Breaker, for ZN12, ZN23, VS1
Contact Info
- Xiangyang Industrial Zone, Liushi Town, Yueqing City,
- 李经理
- 15167417505
- 864640886@qq.com
TD-12/1250A is the core model of an indoor high-voltage vacuum interrupter with a rated voltage of 12 kV and a rated current of 1250 A. The suffix numbers (such as -20/-25/-31.5) represent the rated short-circuit breaking current (in kA), and the complete parameters need to be confirmed in combination with the specific suffix.
Core specification parameters (typical values, taking -20A/-25A/-31.5A as examples)
Rated voltage: 12 kV
Rated current: 1250 A
Rated short-circuit breaking current: 20 kA / 25 kA / 31.5 kA (depending on the suffix)
Rated frequency: 50 Hz
Power frequency withstand voltage (1 min): ≥42 kV
Lightning impulse withstand voltage (peak value): ≥75 kV
Mechanical life: 20,000~30,000 times
Short-circuit breaking times: 30~50 times (full capacity)
Contact gap: 9±1 mm
Loop resistance: ≤20 μΩ (typical value)
Internal gas pressure: ≤1.0×10³ Pa
Shell material: Ceramic or glass (middle-sealed structure)
Contact material: Copper-chromium alloy (CuCr), mostly with longitudinal magnetic field structure
Key structure and installation notes
Structure type: Middle-sealed type, including static/dynamic end covers, main shield, CuCr contacts, and stainless steel bellows.
Torque limit: The dynamic conductive rod can withstand a torsional moment of ≤40 N·m. Anti-rotation measures must be taken during assembly, and the bellows must not be damaged.
Matching requirements: It needs to match the contact gap, overtravel, and opening/closing speed parameters of the circuit breaker operating mechanism; otherwise, it will affect the service life and breaking performance.
Storage period: It can usually be stored for 5~10 years in an unopened state, and it needs to be kept in a moisture-proof, shock-proof, and non-corrosive gas environment.
Application scenarios and selection tips
This interrupter is specially used for 12 kV indoor vacuum circuit breakers (such as VS1, ZN63, ZN28, etc. series), and is suitable for breaking load currents and short-circuit faults in power distribution systems. When purchasing, be sure to check the short-circuit breaking current level (i.e., the number at the end of the model); different levels cannot be mixed. For specific electrical and mechanical data, please refer to the manufacturer's datasheet, as parameters may vary slightly among different manufacturers.
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