Siemens 3VA2140-8JQ42-0AA0 — SENTRON MCCB, 40 A, 4-Pole, ETU560
Breaking capacity is the standout spec here: 440 kA at 240 V, 330 kA at 415 V and 440 V, 220 kA at 500 V, and still 52.5 kA at 690 V. That puts it into high-fault-current switchgear — think utility tie points, large transformer secondaries, or industrial mains where available fault current exceeds 100 kA.
Front-face protection is IP40, adequate for enclosed switchboards but not for washdown environments. The 1.2 W maximum power loss is low enough that ventilation requirements are minimal in a typical distribution panel.