What it is and what it does
The Siemens 3VA2110-5MN32-0AE0 is a SENTRON molded case circuit breaker (MCCB) in the motor protection version, fitted with an ETU350M electronic trip unit. It's a 3-pole breaker rated for a continuous current of 100 A at 40 °C, and it holds that rating all the way up to 50 °C — only starts derating at 55 °C (96 A) down to 90 A at 70 °C. That thermal stability matters if this lives in a warm enclosure next to drives or transformers. The breaking capacity is the headline number here: 187 kA at 240 V, 121 kA at 415/440 V, 75.6 kA at 500 V, and 17 kA at 690 V. That's a high-interrupting rating — it clears serious fault current without the arc re-striking, which is what you need for transformer secondary or large motor branch protection where available fault current is high. Rated insulation voltage is 800 V, so it's comfortable on 480/600 V class systems. Phase failure detection is built in — the ETU350M will trip on loss of a phase, which is standard for motor protection duty.
Panel fit and integration
Dimensions are 181 mm high, 105 mm wide, 86 mm deep — a standard MCCB footprint for this class. It mounts on a DIN rail or directly to a backplate via the screw terminals. The 4 auxiliary switches (HQ type) give you status feedback for PLC inputs or status lamps without needing a separate contactor block. Maximum power dissipation is 75 W at rated load — plan for that heat in the enclosure thermal calculation. The ETU350M release is adjustable; the basic switch variant is 3VA2110-5MN32-0AA0, and the integrated auxiliary trip is 3VA9608-0BB24 if you need a shunt or undervoltage release later.