What it is and what it does
The Siemens 3VA1110-4ED22-0AA0 is a SENTRON molded case circuit breaker (MCCB) for line protection, rated 100 A continuous at 40 °C ambient and carrying a 121 kA interrupting capacity at 240 V AC — that means it can safely clear a fault up to 121 kA without welding contacts or rupturing, which is the figure that governs your SCCR coordination downstream.
Ratings that drive the panel design
Two-pole construction with a TM210 thermal-magnetic release — the thermal element handles overloads, the magnetic element handles short-circuits. The 100 A rating holds across 40 °C, 45 °C, and 50 °C (–), then derates to 98 A at 55 °C, 96 A at 60 °C, 94 A at 65 °C, and 91 A at 70 °C (–). If your panel ambient runs above 50 °C, size the breaker for the derated value. At 415 V AC the breaking capacity drops to 75.6 kA, so verify your available fault current at the installation point. Front face is IP40 — fine for a dry indoor panel; not for washdown zones. Dimensions: 70 mm deep, 50.8 mm wide, 130 mm high (–). Fits standard DIN-rail or panel-mount footprints for a 2-pole MCCB.