What the interrupting ratings mean for your panel
The Siemens SENTRON 3VA1140-4EF36-0HC0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection. Its interrupting capacity is 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at both 500 V and 690 V — per the datasheet, these are the maximum fault currents the breaker can safely clear at each voltage level. For a 480 V panel, the 52.5 kA at 440 V is the closest published figure; at 480 V the actual capability will be slightly lower, so verify coordination with the upstream fault current available. The rated current holds at 40 A from 40 °C through 50 °C ambient, then derates to 39 A at 55 °C and 60 °C, 38 A at 65 °C, and 37 A at 70 °C — that derating curve matters if the breaker sits in a warm enclosure near other heat sources.
Physical fit and integration
The breaker measures 70 mm deep, 76.2 mm wide, and 130 mm high. It mounts on a DIN rail or directly to a panel backplate — the 3-pole width of 76.2 mm (3 inches) is standard for this frame size, so it fits existing SENTRON 3VA cutouts without modification. The supplied basic switch carries order code 3VA11404EF360AA0; the breaker ships with 2 auxiliary switches (HQ design) and a shunt trip (STL) for remote tripping. Rated insulation voltage is 800 V, and maximum power loss is 10.8 W — that loss figure helps size the enclosure ventilation when multiple breakers are ganged.