Description
Siemens 3AY1715-6L VS30041
1. Basic Information
Siemens 3AY1715-6L (VS30041) is an original 12kV medium-voltage vacuum interrupter, specially designed for Siemens 3AH series vacuum circuit breakers. Adopting one-time vacuum sealing technology and Cu-Cr alloy contacts, it features fast arc extinction, stable vacuum tightness, excellent insulation performance and long mechanical & electrical service life. As the core arc-extinguishing component of 10kV/12kV MV switchgear, it is widely used in industrial power distribution, substation and municipal infrastructure for reliable switching and short-circuit protection.
2. Core Technical Specifications
2.1 Basic Parameters
- Model: 3AY1715-6L / VS30041
- Type: MV Vacuum Interrupter (Vacuum Bubble)
- Rated Voltage: 12kV
- Applicable Device: Siemens 3AH series vacuum circuit breaker
- Shell Material: High-strength industrial ceramic insulation
- Contact Material: Cu-Cr arc-resistant alloy
- Manufacturing Process: One-time vacuum sealing & exhausting
2.2 Electrical Parameters
- Power Frequency Withstand Voltage: 42kV (1min)
- Lightning Impulse Withstand Voltage: 75kV
- Rated Continuous Current: Up to 3200A
- Rated Short-circuit Breaking Current: 25kA～31.5kA
- Rated Short-circuit Making Current: 63kA (peak)
- Rated Frequency: 50Hz / 60Hz
- Arc Extinguishing Medium: High vacuum
2.3 Lifetime & Mechanical Parameters
- Mechanical Lifetime: ≥10,000 no-load switching cycles
- Electrical Lifetime: ≥30 full short-circuit breaking operations
- Vacuum Performance: Lifetime maintenance-free, no vacuum attenuation
2.4 Environmental Parameters
- Operating Temperature: -25℃～+65℃
- Storage Temperature: -40℃～+85℃
- Humidity: 5%～95%RH (Non-condensing)
- Execution Standards: IEC 62271, GB/T 1984
3. Main Features
- Ultra-fast Vacuum Arc Extinction: High-vacuum medium quickly extinguishes power-frequency arcs without re-ignition, ensuring safe and reliable breaking of MV circuits.
- Arc-resistant Cu-Cr Alloy Contact: Excellent resistance to arc erosion and short-circuit impact, realizing long electrical service life for frequent switching operation.
- Maintenance-free Vacuum Sealing: Advanced one-time sealing process ensures permanent vacuum without leakage, eliminating routine vacuum maintenance.
- Superior Insulation Performance: High-strength ceramic shell and vacuum insulation provide sufficient voltage withstand margin against overvoltage and flashover risks.
- High-current Breaking Capacity: Supports 3200A continuous current and 31.5kA short-circuit breaking, adapting to heavy-load power distribution scenarios.
- Perfect Original Adaptability: Fully matches Siemens 3AH circuit breakers in size, stroke and mechanical parameters for direct drop-in replacement.
- Eco-friendly & Safe: Oil-free and SF6-free vacuum structure, no environmental pollution and leakage hazards.
- Harsh Environment Durability: Wide temperature resistance, vibration resistance and aging resistance for long-term stable industrial operation.
4. Working Principle
- Normal Insulation State: The contacts are closed during power-on operation, and the high-vacuum cavity provides stable insulation isolation for the MV circuit.
- Arc Generation During Opening: An instantaneous power-frequency arc is generated when the moving and static contacts separate during opening action.
- High-speed Vacuum Arc Extinction: The vacuum medium rapidly de-ionizes and dissipates arc energy, completely extinguishing the arc at the power-frequency zero crossing.
- Insulation Rapid Recovery: The gap insulation strength recovers instantly to prevent arc re-ignition and short-circuit faults.
- Fault Current Isolation: Quickly cuts off short-circuit fault current to isolate faulty sections and protect power distribution equipment.
- Long-term Stable Sealing: The fully sealed cavity maintains constant vacuum degree to ensure consistent arc-extinguishing performance throughout the service life.
5. Typical Applications
5.1 10kV/12kV MV Switchgear
Serves as the core arc-extinguishing component of Siemens 3AH vacuum circuit breakers, used for power switching and fault protection in industrial and commercial MV distribution cabinets.
5.2 Substation Power Distribution System
Applied to inlet/outlet and section circuit breakers of medium and small substations to improve power supply stability and fault isolation capability.
5.3 Heavy Industry Power Distribution
Adapts to harsh working conditions in metallurgy, chemical and mining industries with heavy load fluctuation and frequent switching operations.
5.4 Rail Transit & Municipal Infrastructure
Guarantees uninterrupted and safe power supply for subway, water supply and large public infrastructure projects with high reliability and low maintenance.
5.5 3AH Circuit Breaker Maintenance & Replacement
Replaces aging interrupters with vacuum leakage, insufficient withstand voltage and expired service life to restore full breaker performance without structural modification.
