Core Technical Features

Our vacuum interrupters are engineered with cutting-edge technologies to deliver superior and reliable performance. The key technical characteristics are detailed below:

1. Advanced Contact System

Material: Utilizes premium copper-chromium (CuCr 25/75, 50/50) or copper-tungsten (CuW) contact alloys, optimized for excellent electrical conductivity, high arc erosion resistance, and low chopping current.

Magnetic Field Design: Incorporates either Axial Magnetic Field (AMF) or Radial Magnetic Field (RMF / Spiral) contacts. AMF design maintains a diffuse vacuum arc under high currents, minimizing contact erosion and enabling superior interruption capability up to the maximum rated short-circuit current.

Geometry & Processing: Contacts are precision-machined with optimized profiles and undergo special surface conditioning and aging processes to ensure consistent performance and long electrical life.

2. Superior Insulation System

Envelope Material: Employs high-strength, high-purity alumina ceramic as the primary insulation envelope, offering exceptional dielectric strength, mechanical robustness, and thermal shock resistance compared to glass.

Ceramic-Metal Seal: Features a permanent, helium-leak-tight seal achieved through active metal brazing or direct copper brazing (DCB) technology. This creates a monolithic structure capable of withstanding extreme thermal and mechanical stresses during operation.

Internal Shield: Contains precisely positioned floating metallic shields (stainless steel or copper). These shields protect the ceramic wall from metal vapor deposition during arcing, maintain uniform internal electric field distribution, and enhance overall insulation integrity.

3. Ultra-High & Stable Vacuum

Final Vacuum Level: The sealed internal pressure is maintained at ≤ 1 x 10?? Pa or lower, providing the essential medium for insulation and rapid arc extinction.

Getter Technology: Incorporates non-evaporable getter pumps (typically zirconium-aluminum or barium-based) within the chamber. These getters continuously adsorb residual gases and gas molecules released during the product's lifetime, ensuring long-term vacuum stability.

Exhaust & Sealing: The chamber is evacuated and baked at high temperatures via a dedicated exhaust port, which is then sealed using a cold-weld technique, guaranteeing a permanent, leak-proof closure.

4. Precision Mechanical Design

Bellows: Uses seamless, hydraulically formed stainless steel bellows as the dynamic vacuum seal. They are designed and fatigue-tested for a mechanical life exceeding 30,000 operations, ensuring reliable contact travel without compromising vacuum integrity.

Contact Travel & Speed: Optimized contact stroke and high, consistent closing/opening speeds are achieved through precise mechanical coupling with the operating mechanism, contributing to reliable arc interruption.

Overall Structure: Compact, symmetrical, and robust design minimizes internal inductance, enhances heat dissipation, and ensures compatibility with various circuit breaker/contactor designs.

5. Key Electrical Performance Parameters

Rated Voltage: Covering standard medium-voltage levels (e.g., 7.2kV, 12kV, 24kV, 40.5kV).

Rated Current: Typically ranging from 630A to 4000A (continuous).

Short-Circuit Interrupting Capacity: Designed to interrupt currents from 12.5kA to 63kA (or as required) efficiently.

Dielectric Strength: Withstands high-power frequency and lightning impulse voltages as per IEC/IEEE standards.

Long Electrical Life: Capable of performing thousands of operations at rated current and numerous operations at full short-circuit current.