Breaking capacity runs 242 kA at 240 V, 187 kA at 415/440 V, 121 kA at 500 V, and 3.7 kA at 690 V, so it handles high-fault utility feeds downstream of a transformer.
That 86 mm depth (3.39 in) matters when the MCCB sits in a shallow enclosure or a pull-section behind a deadfront — verify the gutter depth before laying out the bus bars. Width of 140 mm (5.51 in) is standard for a 4-pole SENTRON 3VA frame; it occupies four 35 mm DIN-rail modules worth of panel width if using the optional DIN-rail mount adapter.
The 100 A continuous rating is the breaker's full-scale value — set the Ir (thermal) long-time pickup at or below this for the protected feeder. The 242 kA interrupting rating at 240 V tells you this MCCB can safely clear a fault at that level without venting or upstream cascade; at 690 V the same frame drops to 3.7 kA, so verify the available fault current at the installation voltage.