Key ratings and what they mean for your panel
The Siemens SENTRON 3VA1340-5EF32-0HC0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection at 400 A continuous current, with no derating needed up to 50 °C ambient — at 55 °C it still holds 392 A, and at 70 °C it carries 367 A, so it handles warm enclosures without forced cooling. Its interrupting capacity is 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 11.9 kA at 690 V — these are the fault currents it can safely clear at each voltage level, which determines whether it coordinates with upstream gear or requires a current-limiting fuse ahead of it. Rated insulation voltage is 800 V, so the breaker is suitable for 690 V line-to-line systems with margin on the insulation coordination.
Built-in accessories and what they do
This variant ships with a shunt trip release (STL) for remote tripping and two auxiliary switches (HQ) for status feedback — both factory-installed, so no field wiring of add-on modules. It does not include an undervoltage release, ground-fault monitoring, or communication function — if those are needed, this is not the right order code. The breaker has a voltage-trigger mechanism and no trip indicator; the supplied basic switch is order code 3VA13405EF320AA0.
Physical fit and environment
Dimensions are 248 mm high, 138 mm wide, and 110 mm deep — standard SENTRON 3VA1 footprint for 400 A frame, so it drops into existing 3VA panel cutouts and bus-bar arrangements without modification. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. Maximum power dissipation at rated current is 92.1 W — account for that heat in the enclosure thermal budget.