Siemens SENTRON 3VA1140-5EF36-0CH0 — 40 A MCCB with 187 kA Interrupting Rating
Its interrupting capacity reaches 187 kA at 240 V AC, 121 kA at 415 V, and 75.6 kA at 440 V — these figures tell you it handles high-fault-current scenarios typical of industrial mains distribution, not just branch circuits.
Rated current holds flat at 40 A from 40 °C up to 50 °C, then derates to 39 A at 55–60 °C and 38 A at 65 °C, 37 A at 70 °C — so in a warm enclosure you lose only about 3 A at the top of the operating range. Maximum power loss is 13.3 W; in a dense panel that heat adds up, so factor it into your thermal budget if you're stacking multiple breakers in a sealed enclosure.
Dimensions are 130 mm height, 76.2 mm width, 70 mm depth — a standard 3-pole MCCB footprint that fits SENTRON mounting plates and common DIN-rail adapter bases.