What it is and what the ratings mean
The Siemens SENTRON 3VM1110-4ED42-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated for a continuous current Iu of 100 A, with a TM210 thermal-magnetic overcurrent release. The interrupting capacity is the headline: 121 kA at 240 V AC, 76 kA at 415 V, 53 kA at 440 V, and 11.9 kA at 500 V — so it handles high-fault-current panels where a standard MCB would weld closed. The TM210 release means the thermal pickup is fixed at 100 A (Ir max), and the magnetic short-circuit pickup (Ii) is adjustable up to 1000 A, giving you coordination flexibility downstream. Rated insulation voltage Ui is 690 V, and the maximum DC operational voltage Ue is 500 V, so it works in both AC and DC distribution — common in mixed-load panels with VFD DC links or battery banks. The power loss tops out at 25 W, which is modest for a 100 A frame; panel ventilation is still advisable if you cluster several breakers. Temperature derating is minimal up to 50 °C (still 100 A), then drops to 98 A at 55 °C, 96 A at 60 °C, 94 A at 65 °C, and 91 A at 70 °C. That means in a hot enclosure — say, near a drive or transformer — you lose less than 10 % of capacity even at 70 °C, so you don't need to oversize the frame for ambient heat.
Where it goes and how it mounts
This MCCB is designed for panel-mount installation — typically bolted onto a mounting plate or DIN-rail adapter in a distribution board or motor control center. The front face carries an IP40 rating, meaning it's protected against tools and wires >1 mm but not against water ingress; keep it inside a cabinet rated for the environment. Dimensions: 70 mm deep, 101.6 mm wide, 130 mm high. That 101.6 mm width (4 inches) is the standard 4-pole MCCB footprint for this class — it fits the same cutout as the 3VA1 series, so a panel laid out for the older 3VA1010-2ED32-0JA0 will accept this breaker without rewiring the bus bars or drilling new holes.