Its 40 A rated continuous current (Iu) holds at ambient temperatures up to 50 °C without derating; above that, it steps down to 38.4 A at 55 °C and 36 A at 70 °C, which matters if you're packing this into a warm enclosure or a high-fill panel. The interrupting ratings climb with voltage: 52.5 kA at 240 V, 32 kA at 415 V, 13.6 kA at 440 V, and 7.5 kA at 690 V — so it handles high available fault current on the low-voltage side of a 480 V or 400 V distribution transformer, but you need to check the SCCR of the whole assembly, not just the breaker. The TM210 overcurrent release is a fixed thermal-magnetic type — no interchangeable trip units, so what you order is what protects the circuit.
DIN-rail and panel fit
That width — essentially 3 x 25.4 mm modules — is standard for a 3-pole MCCB in the SENTRON 3VA family, so it drops into the same footprint as other 3VA breakers on the DIN rail.