Rated for 400 A continuous, 187 kA interrupting at 240 V
The Siemens SENTRON 3VA2340-5HN42-0BC0 is a 4-pole molded case circuit breaker rated for 400 A continuous current, with an interrupting capacity of 187 kA at 240 V AC and 121 kA at 415 V AC. Thermal derating is flat at 400 A from 40 °C up to 50 °C, then steps down to 385 A at 55 °C and 340 A at 70 °C.
Line protection with undervoltage release and auxiliary switches
This MCCB is designed for line protection — it's not a motor-protective breaker with integrated overload class. The basic switch (the thermal-magnetic trip unit) is order code 3VA2340-5HN42-0AA0 — that's the replaceable core if the trip unit fails.
Mounting footprint: 184 mm wide, 248 mm tall, 110 mm deep. That 184 mm width for a 4-pole frame is standard for 400 A MCCBs in the SENTRON 3VA platform — it occupies three full 18 mm module positions plus some overhang. Plan for a 110 mm depth behind the panel door to clear the arc-chamber vents and rear terminals.