Product Description
Siemens 3AH4305‑4 is a German‑origin withdrawable medium‑voltage vacuum circuit‑breaker of 3AH4 series for 36 kV / 40.5 kV system. It is equipped with EK spring‑stored‑energy operating mechanism, fitted with vacuum interrupters and cast‑resin post insulators. Both motor charging and manual crank charging are supported for normal switching and short‑circuit fault protection. Complying with IEC 62271‑100 and classified to E2/C2/M2 high‑end endurance class, it features high mechanical reliability for 35 kV withdrawable switchgear. This model is obsolete / EOL; available units are surplus new, used or refurbished spare parts only.
Technical Specifications
| Item | Specifications |
|---|---|
| Model | 3AH4305‑4 |
| Rated voltage | 36 kV / 40.5 kV |
| Rated continuous current | 2000 A |
| Rated short‑circuit breaking current | 31.5 kA |
| Pole centre distance | 350 mm |
| Operating mechanism | EK spring‑stored‑energy, motor & manual crank charging |
| Mechanical endurance | Up to 120 000 operating cycles |
| Power‑frequency withstand voltage | 85 kV |
| Lightning impulse withstand voltage | 185 kV |
| Rated frequency | 50 Hz / 60 Hz |
| Standard | IEC 62271‑100, Class E2/C2/M2 |
| Origin | Germany |
| Status | Obsolete EOL, successor series: 3AH5 |
Product Applications
- 35 kV main step‑down substations for industrial plants, switching and protection for transformers, busbars and feeder circuits.
- Medium‑voltage distribution systems in power plants, water plants, metallurgy and mining facilities.
- Installed in 35 kV withdrawable switchgear for new‑project stock equipment and legacy machinery retrofitting & replacement.
- 36‑40.5 kV switchgear for public substations and infrastructure projects.
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