The Siemens SENTRON 3VM1340-4GD42-0AA0 is a 4-pole molded case circuit breaker rated 400 A at 40 °C, with a TM210 thermal-magnetic overcurrent release designed for line protection. It breaks up to 121 kA at 240 V and 76 kA at 415/440 V, so it handles high-fault utility feeds or large transformer secondaries without cascading upstream.
Current ratings and thermal behavior
Rated 400 A continuous from 40 °C through 50 °C ambient, then derates to 392 A at 55 °C, 384 A at 60 °C, 376 A at 65 °C, and 367 A at 70 °C (–).
Listed as current production. No phase-out or last-time-buy notice on this order code.
Measures 110 mm deep, 184 mm wide, 248 mm tall (–). The 4-pole body at 184 mm width is standard for this frame size — verify the existing busbar or lug kit spacing if retrofitting into a panel cut for a narrower 3-pole breaker.