What this MCCB is and where it fits
The Siemens 3VA2110-6HN46-0AA0 is a SENTRON 3VA2 molded case circuit breaker (MCCB) rated for 100 A continuous current on a 4-pole frame, built for line protection in distribution panels and motor control centers. The ETU350 electronic trip unit gives you adjustable overload and short-circuit protection curves, so you can coordinate selectively with downstream breakers. At 240 V it interrupts 242 kA — that is the full available fault current at most service entrances, meaning this breaker can sit at the main without needing a current-limiting fuse ahead of it. At 415 V it still holds 187 kA, which covers high-capacity industrial feeds. The 800 V rated insulation voltage keeps it safe on 690 V systems, where the interrupting rating drops to 3.7 kA — fine for downstream subfeeds but not for a main on a 690 V bus.
Physical fit and panel integration
The 3VA2110-6HN46-0AA0 measures 140 mm wide, 181 mm tall, and 86 mm deep. That 86 mm depth is the dimension that matters for enclosure depth — it fits a standard 200 mm deep panel with room for rear-mounted busbars or wiring ducts. The 140 mm width on a 4-pole breaker is typical for the 100 A frame; verify the mounting footprint against your existing busbar spacing or DIN-rail adapter if retrofitting. Front protection is IP40, meaning no ingress protection against water but adequate for dry indoor switchgear. Max power loss is 10 W — negligible for thermal budgeting in a ventilated enclosure, but worth noting if you are packing multiple breakers in a sealed cabinet.
What the ratings mean for your application
The 100 A rating holds flat from 40 °C to 70 °C ambient (through) — no derating needed in a warm panel, which is unusual for a thermal-magnetic breaker. That is the advantage of the electronic ETU350: it compensates for ambient temperature, so you do not have to oversize the frame for a hot environment. The interrupting ratings at different voltages (–) tell you where this breaker can serve as a main or a feeder. At 240 V and 415 V the numbers are high enough for any utility transformer secondary. At 500 V the 121 kA still covers most industrial bus ratings. At 690 V the 3.7 kA is low — use it only on low-fault subfeeds or downstream of a current-limiting device. The 4-pole design handles three-phase plus neutral — common for North American 120/208 V or 277/480 V wye systems where you need to switch the neutral.