3AV1 FG-145
Live-tank vacuum circuit breaker 3AV1FG Blue, 145 kV, 40 kA, clean-air insulation (zero SF6)
3AV1 FG-145
- Vacuum interrupting with clean-air insulation: 0 kg fluorinated greenhouse gases, no gas handling, reporting or F-gas training requirements
- 30 full short-circuit interruptions at 40 kA and 10,000 operations at rated current 3,150 A; interrupter unit maintenance-free for its full lifetime
- Full switching performance down to -60 °C ambient temperature; optional 2-cycle current interruption
- Based on the proven modular platform (operating mechanism, control system, base frame, kinematic chain); in production since 2017, more than 150 units delivered worldwide
- Approx. 25 t CO2e lifecycle saving compared with an equivalent 145 kV SF6 breaker (3AP1FG)
Air-insulated substations up to 145 kVSF6-free alternative to equivalent 145 kV SF6 breakers (approx. 25 t CO2e lifecycle saving vs 3AP1FG)Low-temperature grid installations down to -60 °C145 kV circuit-switcher duty (IEEE/ANSI, 60 Hz)
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3AV1 FG-145 covers up to 145 kV of the circuit breakers range (≤ 800 kV across the category, √ scale).
Specifications
Main
| Type | Outdoor live-tank circuit breaker |
| Family / designation | 3AV1FG (3AV1 Blue LT), Siemens Energy Blue portfolio |
| Interrupting technology | Vacuum interrupter, 1 interrupter unit per pole |
| Insulating medium | Clean air |
| Fluorinated gas content | 0 kg / 0 t CO2 equivalent |
| Operating mechanism | Stored-energy spring drive (modular platform standard) |
| Track record | In production since 2017; more than 150 units delivered worldwide |
Electrical
| Rated voltage | up to 145 kV |
| Rated frequency | 50 / 60 Hz |
| Rated normal current | up to 3,150 A |
| Rated short-circuit breaking current | up to 40 kA |
| Rated short-time withstand current / duration | up to 40 kA, 3 s |
| Rated peak withstand current | 108 kA (2.7 p.u.) |
| Rated power-frequency / lightning impulse withstand voltage | 275 kV / 650 kV |
| Rated break time | 3 cycles; 2 cycles optional |
| First-pole-to-clear factor | 1.5 / 1.3 p.u. |
| Capacitive voltage factor | 1.4 p.u. |
Mechanical / environment
| Ambient temperature range | -60 to +55 degrees C |
| Operations at rated normal current (3,150 A) | 10,000 |
| Operations at rated short-circuit breaking current (40 kA) | 30 |
| Maintenance schedule | 12 years: visual inspection and checks; up to 10,000 operations at 3,150 A; interrupter unit maintenance-free for full lifetime |
| Pole spacing / base frame width | 1,700 mm / 3,800 mm |
| Lifecycle CO2e vs 145 kV SF6 breaker | approx. 25 t CO2e saved (vs 3AP1FG 145 kV) |
Standards & certifications
| Type testing | Tested in accordance with IEC 62271-100, -110 and -310 |
| Rating basis | All values in accordance with IEC; other values on request |
| IEEE/ANSI | On request as 145 kV, 60 Hz circuit switcher in accordance with IEEE/ANSI |
Options & variants
Configurations per the 2025 3AV1 Blue LT flyer; other ratings on request.
| Configuration | Rated voltage | Breaking current | Rated current | Notes |
|---|---|---|---|---|
| 3AV1FG Blue LT (standard) | up to 145 kV | up to 40 kA | up to 3,150 A | 3-cycle rated break time, 2-cycle optional; 50/60 Hz; -60 degrees C operation is standard; single interrupter per pole |
| 145 kV circuit switcher (IEEE/ANSI) | 145 kV | on request | on request | 60 Hz, available on request in accordance with IEEE/ANSI |
Documents & downloads
Brochure 3AV1 Blue LT Circuit Breaker Flyer (2025)
Brochure 3AV1 Blue DT Circuit Breaker Flyer
Catalog High-Voltage Circuit Breakers from 72.5 kV up to 1100 kV (2022) (current online edition)
Flyer 3AV1 Blue Circuit Breaker — clean air technology in our live tank circuit breaker with Zero SF6 (current online edition)
Also covered in the technical library
Catalog Gas-insulated switchgear from 72.5 kV up to 550 kV — Siemens Energy GIS brochure
Ordered designations
Representative orderable type designations of this family — searchable via the catalog search.
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