The Siemens 3VA1125-4GD42-0AA0-ZD00 is a 4-pole IEC frame 160 circuit breaker from the 3VA1 series, rated at 25 A with a breaking capacity class S delivering 36 kA Icu at 415 V. It carries fixed thermal-magnetic line protection (TM210) with Ir set at 25 A and short-circuit pickup Ii at 12.8 × In. The N conductor is protected at 100%.
What the ratings mean for fit
The 36 kA Icu at 415 V is the maximum short-circuit current the breaker can safely interrupt under IEC 60947-2 — critical for verifying SCCR coordination with upstream gear. The fixed Ir at 25 A and Ii at 12.8 × In (320 A) means this unit is pre-configured for a specific load; no thermal dial adjustment is possible. The 100% N protection suits 4-wire systems where neutral current can approach phase current, common in harmonic-rich loads like VFD-fed lines.