That 40 A rating holds flat from 40 °C through 50 °C, then derates to 39 A at 55–60 °C and 37 A at 70 °C — so in a warm enclosure you lose only a few amps before the thermal curve starts pulling the trip threshold down. The 187 kA interrupting capacity at 240 V is the headline number for fault duty; at 415 V it still breaks 121 kA, and at 690 V it holds 17 kA.
The 3VA1140-5EF32-0KA0 measures 130 mm high, 76.2 mm wide, and 70 mm deep — a standard 3-pole MCCB footprint that drops into a SENTRON panelboard or a DIN-rail adapter.