What this MCCB delivers
The Siemens 3VA1040-4ED32-0AF0 is a SENTRON molded case circuit breaker built for line protection in distribution panels. Three poles, rated 40 A at 40 °C ambient, with a TM210 thermal-magnetic release — the thermal element handles overloads, the magnetic element clears short circuits. Breaking capacity hits 121 kA at 240 V and 75.6 kA at 415 V, so it handles high-fault utility feeds without cascading upstream.
Breaking capacity across voltages
This MCCB delivers 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. That spread covers most industrial supply voltages — the 415 V figure is what matters for a 400 V class panel in Europe or Asia; the 240 V figure suits North American 120/240 V services.
Thermal derating and enclosure fit
Rated 40 A from 40 °C to 50 °C ambient, then derates to 38.4 A at 55 °C, 37.6 A at 60 °C, 36.8 A at 65 °C, and 36 A at 70 °C. In a sealed panel running hot, you lose about 10 % of the rating. Dimensions are 130 mm high, 76.2 mm wide, 70 mm deep — standard 3-pole MCCB footprint for DIN-rail or panel-mount integration.