SENTRON 3VA2340-6KQ42-0AA0 — 400 A line protection MCCB
The Siemens 3VA2340-6KQ42-0AA0 is a SENTRON molded case circuit breaker designed for line protection, rated at 400 A continuous current with a 4-pole configuration. Its interrupting capacity varies by voltage: 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 7.5 kA at 690 V — the 690 V figure is the real constraint for high-voltage distribution, not the headline 242 kA number. This breaker carries a thermal derating curve: full 400 A up to 50 °C, then 375 A at 55 °C, 350 A at 60 °C, 325 A at 65 °C, and 300 A at 70 °C. For a panel running at 55 °C ambient, the usable current drops to 375 A — factor that into the bus bar and downstream protection sizing. It includes ground-fault monitoring via summation current formation on L+N conductors, plus communication and other measurement functions — so it can feed status and metering data back to a monitoring system without a separate CT module.
Physical fit and panel integration
Dimensions are 184 mm wide, 248 mm high, 110 mm deep — a 4-pole frame that needs 184 mm of mounting-plate width. Verify gland-plate clearance on the 110 mm depth.