The Siemens 3AH4 arc furnace breaker portfolio is purpose-built for the relentless demands of steel production – where furnaces routinely perform more than 100 switching cycles a day and require both high switching frequency and heavy power capacity.

Optimized for small and mid-size furnaces up to 200 MVA, and adaptable through parallel configurations for larger installations, the 3AH4 delivers endurance and peace of mind where it matters most.

• up to 40.5 kV
• up to 40 kA
• up to 4000 A
• up to 120,000 operations