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3AP1-FG

The 3AP1-FG is a SF₆ gas-insulated high-voltage circuit breaker from Siemens, designed for outdoor substations and power transmission networks. It provides reliable short-circuit interruption and load switching for voltages up to 550 kV, ensuring grid stability and protection in utility and industrial applications.

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TEL：400-887-3214
Mail：jilineasyyi@outlook.com
Q Q：615739355
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Key Features
✔ SF₆ Gas Insulation – High dielectric strength, low maintenance
✔ Spring-Operated Mechanism – Fast, reliable tripping (≤3 cycles)
✔ Modular Design – Adaptable for single- or three-phase operation
✔ Low Operating Energy – Reduced wear and long service life
✔ Integrated Monitoring – Gas density, contact wear, and operation counters

3. Technical Specifications
3.1 Electrical Ratings
Parameter Specification
Rated Voltage (Ur) 145 kV / 245 kV / 550 kV
Rated Current (Ir) 3150 A / 4000 A (options)
Short-Circuit Current (Isc) 40 kA / 50 kA / 63 kA
Breaking Capacity 100% asymmetrical current
Dielectric Strength 650 kV (lightning impulse)
3.2 Mechanical & Operational
Operating Mechanism: Spring-assisted, motor-driven

Interruption Time: ≤60 ms (3 cycles)

Mechanical Endurance: 10,000 operations

Electrical Endurance: 5,000 full-load interruptions

Gas Pressure Monitoring: Yes (with alarms)

3.3 Environmental & Safety
Temperature Range: -30°C to +50°C

SF₆ Gas Handling: Leak rate <0.5% per year

Protection Class: IP55 (outdoor-rated)

Seismic Resistance: Up to 0.5g (optional)

4. Typical Applications
✔ Transmission Substations – 220 kV / 550 kV networks
✔ Renewable Energy Plants – Wind/solar farm grid connections
✔ Industrial Power Systems – Steel mills, refineries
✔ Railway Electrification – High-speed rail power supply