What this MCCB carries and where it fits
The Siemens SENTRON 3VA2340-6HN32-0DL0 is a 3-pole molded case circuit breaker rated for 400 A continuous current at 40 °C, with a maximum breaking capacity of 242 kA at 240 V and 187 kA at 415 V. It is designed for line protection in distribution panels, with an undervoltage release (UVR) fitted as standard. The frame dimensions — 248 mm height, 138 mm width, 110 mm depth — place it in the 3VA2 frame family, which mounts on a standard DIN rail or panel-mount footprint for switchboard integration.
Thermal derating and breaking capacity — the real selection numbers
The 400 A continuous rating holds from 40 °C through 50 °C. Above that, the breaker derates linearly: 385 A at 55 °C, 370 A at 60 °C, 355 A at 65 °C, and 340 A at 70 °C. For a panel that runs warm — say 55 °C ambient inside the enclosure — the usable current drops to 385 A, so the load must be sized accordingly. The breaking capacity is voltage-dependent: 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. At 690 V the 7.5 kA figure governs; verify the available fault current at that voltage before specifying.
Auxiliary switch configuration and release
This variant ships with 2 auxiliary switches, 1 trip alarm switch, and 1 electrical alarm switch (HQ configuration), plus the undervoltage release (UVR). The UVR trips the breaker when control voltage drops below a threshold — standard for emergency-stop or undervoltage protection schemes. The basic switch core is order code 3VA2340-6HN32-0AA0, which means the auxiliary and release modules are factory-integrated, not field-added.