What this MCCB carries and where it fits
The SENTRON 3VA2340-5HN32-0BH0 is a 3-pole molded case circuit breaker rated for 400 A continuous current (Iu) at 40 °C through 50 °C without derating — above that it steps down to 385 A at 55 °C, 370 A at 60 °C, 355 A at 65 °C, and 340 A at 70 °C. The ETU350 electronic trip unit handles the overcurrent protection curve; an undervoltage release (UVR) is factory-fitted. Breaking capacity hits 187 kA at 240 V AC, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 17 kA at 690 V — so the 240 V figure is the headline, but the 415 V/440 V rating is what drives most industrial panel coordination studies. Footprint is 138 mm wide by 248 mm tall by 110 mm deep — standard 3-pole MCCB form factor for a 400 A frame. The auxiliary contact configuration ships as 2 auxiliary switches plus 1 trip alarm switch (HQ type). Rated insulation voltage is 800 V, and maximum power loss at rated current is 98.5 W — factor that into enclosure thermal rise calculations.
Integration notes for the panel builder
Mounts on a standard DIN rail or direct panel-mount via the 3VA2 mounting base. The 138 mm width occupies three 45 mm module spaces — verify gland plate cutouts if retrofitting into an existing MCC bucket. The undervoltage release (UVR) is wired separately; confirm control voltage matches the panel's 24 VDC or 110/230 VAC supply before commissioning. The ETU350 trip unit is field-replaceable without removing the breaker from the panel.