What this MCCB does on the line
The Siemens 3VA2010-6HL32-0AJ0 is a SENTRON molded case circuit breaker (MCCB) rated for 100 A continuous current, with an ETU320 electronic trip unit providing line protection. Its interrupting capacity hits 242 kA at 240 V and 187 kA at 415 V — that's the short-circuit current it can safely clear without welding contacts or rupturing the case. The 3-pole design fits standard panel mounting, and the IP40 front rating means it's protected against tools and small wires entering the enclosure face, but not washdown.
Thermal derating — the real current you get
The 100 A rating holds flat from 40 °C to 50 °C. Above that, it derates: 96.25 A at 55 °C, 92.5 A at 60 °C, 88.75 A at 65 °C, and 85 A at 70 °C. If your panel ambient runs hot, size the breaker for the derated figure, not the nameplate 100 A.
Breaking capacity by voltage — selectivity planning
The interrupting ratings step down with voltage: 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 4 kA at 690 V. For coordination studies, the 690 V figure is the one that governs if your system runs at that level — it's a sharp drop from the lower-voltage performance.
Auxiliary contacts and trip signaling
Comes with 2 auxiliary switches plus 1 trip alarm switch (HP type). The trip indicator is built in — you get a visual flag and the alarm contact for remote annunciation. No undervoltage release, no shunt trip, no communication module on this variant.