The Siemens SENTRON 3VA1340-6EE42-0AA0 is a 4-pole molded case circuit breaker rated for 400 A continuous current at 40 °C, with a TM220 thermal-magnetic release. It carries a 220 kA interrupting capacity at 240 V, stepping down to 154 kA at 415 V and 440 V, and 17 kA at 690 V — the SCCR headroom needed for high-fault utility feeds or transformer secondaries where a standard MCCB would cascade-fail upstream.
Current rating and thermal derating
Rated continuous current Iu is 400 A, and the breaker holds that rating flat from 40 °C through 50 °C. Above that, derating is linear: 392 A at 55 °C, 384 A at 60 °C, 376 A at 65 °C, and 367 A at 70 °C. For a panel OEM stuffing a 400 A feed, the 50 °C ceiling means no ampacity penalty in a ventilated enclosure; above that, the derating curve governs the actual load you can hang on the line.
Breaking capacity by voltage
The interrupting ratings span the voltage range a site electrical engineer needs for selective coordination studies: 220 kA at 240 V, 154 kA at 415 V and 440 V, 121 kA at 500 V, and 17 kA at 690 V. The 220 kA figure at 240 V places this MCCB in the high-interrupting class for 240 V delta or split-phase services where available fault current exceeds 100 kA. At 690 V the 17 kA rating is lower but still adequate for most 690 V motor control centers with current-limiting fuses upstream.
Physical integration and environment
Dimensions are 248 mm high, 184 mm wide, and 110 mm deep — a standard 4-pole MCCB footprint that drops into a SENTRON panelboard or a DIN-rail adapter kit. Front protection is IP40, so the breaker is suited for enclosed panel mounting where the front face is behind a door; it is not rated for washdown or outdoor exposure. Operating temperature range is -40 °C to 70 °C, with storage from -40 °C to 80 °C. Maximum power loss is 92.1 W, which factors into enclosure thermal calculations for a multi-breaker lineup.
Release and protection design
The overcurrent release is a TM220 — a thermal-magnetic design with fixed thermal and magnetic trip settings, no electronic adjustment or communication function. Rated insulation voltage is 800 V, and maximum rated operational voltage with DC is 600 V. The breaker is configured for line protection (not ground-fault or N-conductor protection), and the short-circuit protection design references the 3VA device manual for DC switching applications.