Breaking capacity and selectivity
The 3VA1110-3FD42-0AA0: This MCCB delivers 76 kA breaking capacity at 240 V, dropping to 53 kA at 415 V, 32 kA at 440 V, and 11.9 kA at both 500 V and 690 V. That spread matters for panel coordination: at 415 V it clears 53 kA faults, which is enough headroom for most industrial secondary distribution boards downstream of a transformer. At 690 V the 11.9 kA rating still covers typical motor-circuit fault levels in 690 V drives. The 4-pole construction with 50% N-conductor protection means the neutral pole is sized at half the phase rating — standard for balanced loads where the neutral carries only unbalanced current, not full phase current. If the panel feeds single-phase line-to-neutral loads that could pull the neutral up to phase current, that's a detail to check.
Thermal derating curve — what the numbers mean
The 100 A rating holds flat up to 50 °C ambient. Above that it derates: 98 A at 55 °C, 96 A at 60 °C, 94 A at 65 °C, and 91 A at 70 °C. If the panel runs hot — say a packed enclosure next to a furnace line — the 91 A at 70 °C figure is the one to design to, not the 100 A nameplate. The TM210 release is fixed-trip, not adjustable, so the thermal curve is what it is.
Panel fit and mounting
Footprint: 101.6 mm wide, 130 mm tall, 70 mm deep. That 4-inch width is standard for a 4-pole MCCB in the 3VA frame size — it occupies one full 4-inch module on the DIN rail or mounting plate. The 70 mm depth (2.8 in) leaves room for rear-access busbars or cable ladders behind the panel door. IP40 on the front means it's protected against tools and wires >1 mm, but not sealed against dust ingress — indoor panel use only.