What this MCCB carries and where it fits
The Siemens SENTRON 3VA1040-4ED32-0CC0 is a 3-pole molded case circuit breaker rated 40 A continuous at 40 °C, with a line-protection trip curve and an undervoltage release (UVR) built in. That 40 A holds steady through 50 °C; above that it derates to 38.4 A at 55 °C and 36 A at 70 °C, so if your panel ambient runs hot, size the breaker for the derated number, not the nameplate. Interrupting capacity is the headline: 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 means it can clear a fault at those levels without welding contacts or venting gas into the enclosure — critical for high-fault panels where a standard MCCB would cascade upstream. Rated insulation voltage is 800 V. Max power loss is 13.3 W.
Built-in auxiliaries and release
This order code ships with two HQ auxiliary switches and an undervoltage release (UVR) factory-fitted. The UVR trips the breaker when control voltage drops below a set threshold — standard for emergency-stop circuits or undervoltage protection on motor feeders. The two aux switches give you one N/O and one N/C contact for status feedback to a PLC or indicator lamp, no separate add-on block needed. The supplied basic switch is 3VA10404ED320AA0, so if you're replacing an existing 3VA1040-4ED32-0CC0, that's the core assembly. No communication module, no ground-fault monitoring, no voltage-trip accessory — this is a straight line-protection breaker with UVR and aux contacts, nothing more.