What this MCCB does — and what the ratings mean for your panel
The Siemens 3VA2025-7HM46-0AA0 is a 4-pole molded case circuit breaker from the SENTRON family, designed for line protection with integral ground-fault monitoring via summation current formation on the L + N conductors. Rated 25 A continuous at 40 °C and holding that same 25 A all the way to 70 °C — no derating needed across the typical panel ambient range. The interrupting ratings tell the real story: 330 kA at 240 V, 242 kA at 415 V and 440 V, 187 kA at 500 V, and 3 kA at 690 V. That 330 kA at 240 V means it can safely clear a fault up to 330 kA without rupturing — critical for high-fault-capacity mains or sub-distribution where upstream transformers can deliver massive short-circuit current. The 3 kA at 690 V is a reminder that at higher voltages the arc-quenching capability drops sharply; this breaker is not intended for 690 V primary protection.
Fit and footprint — panel integration notes
The breaker measures 86 mm deep, 140 mm wide, and 181 mm high — a standard SENTRON 3VA footprint that fits existing DIN-rail or screw-mounted panel layouts. No undervoltage release, no voltage trigger, no communication module on this variant; it is a straight line-protection device with ground-fault summation. The 0.5 W maximum power loss keeps heat rise negligible in a sealed enclosure.