11kv 25ka vcb vacuum bottle interrupter is the core arc-extinguishing component of medium-voltage vacuum circuit breakers, widely used in 11kV power distribution systems. It adopts a fully sealed ceramic shell, with CuCr50 alloy contacts and a high-vacuum (≤5×10⁻⁴ Pa) arc-extinguishing medium, featuring compact structure, light weight and excellent insulation performance. Rated short-circuit breaking current is 25kA, rated current ranges from 630A to 2000A, and mechanical life is over 10,000 operations, meeting IEC 62271-100 standards, suitable for indoor switchgear in industrial and power distribution scenarios.
11kv 25ka vcb vacuum bottle interrupter’s operation principle is based on vacuum arc extinguishing: when closing, the moving contact is driven by the operating mechanism to contact the static contact, forming a current path. When opening, contacts separate to generate an arc, which is quickly cooled and extinguished due to the low particle density in vacuum, with instant dielectric strength recovery. During operation, the shielding system absorbs arc energy to prevent metal vapor deposition, while the stainless steel bellows ensures airtightness during contact movement, ensuring stable and reliable operation of the power system.
| Technical Parameter | Specification |
| Rated Voltage(Un) | 11kV |
| Rated Short-Circuit Breaking Current(I₅n) | 25KA(4s) |
| Rated Current(In) | 630A/1250A/1600A/ 2000A |
| Rated Short-Circuit Making Current (Imak) | 63KA(Peak) |
| Internal Vacuum Pressure | ≤5×10-4 Pa |
| Contact Material | CuCr Alloy(CuCr50) |
| Mechanical Life | ≥10,000 Operations |
| Insulation Level | AC 48kV/1min;Lightning Impulse 85KV |
| Contact Gap | 9±1 mm |
Strong Breaking Capacity: Reliably interrupts 25kA short-circuit current, meeting IEC 62271-100 standards.
Fast & Stable: Arc extinguished in milliseconds; no re-ignition; dielectric recovery speed is unmatched.
Long Life & Low Maintenance: CuCr contacts have low wear; mechanical life ≥10,000 operations; almost maintenance-free.
Safe & Eco-Friendly: No oil/gas; no explosion/fire risk; arc not exposed; low noise and zero pollution.
Compact & Reliable: Small size, light weight, high adaptability to indoor switchgear; stable performance under harsh conditions.
Q:How to install and maintain 11kv 25ka vcb vacuum bottle interrupter ?
A:Firstly,Install vertically in VCB and ensure concentricity with operating mechanism.
Secondly,Avoid mechanical shock and keep clean/dry during installation.
Lastly,No internal maintenance required; replace when contact wear exceeds limit (≤3mm).
Regularly check insulation and tightness; follow manufacturer’s test cycles.
Q: Is it compatible with 12kV power systems?
A: Yes, it is fully compatible. The rated voltage is 11kV, which is designed to match the 12kV power distribution system, meeting the actual application needs of most medium-voltage scenarios.
Q:What contact material is used, and what are its advantages?
A: It adopts CuCr50 alloy contacts, which have the advantages of low wear, strong arc resistance and long service life, ensuring stable breaking performance even under 25kA short-circuit curre
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