Breaking capacity and selectivity headroom
The 3VA2340-6JP32-0AE0: The 242 kA at 240 V is the maximum short-circuit current this MCCB can safely interrupt — that figure drops to 187 kA at 415 V and 440 V, 121 kA at 500 V, and 40 kA at 690 V. For a site electrical engineer coordinating a distribution board, the 187 kA at 415 V gives substantial headroom above typical utility fault levels (usually 25–50 kA), so you can maintain selectivity with downstream breakers without oversizing the main. The 800 V rated insulation voltage (Ui) confirms the frame is built for 690 V systems.
Thermal derating and enclosure fit
The 400 A rating holds flat from 40 °C to 50 °C. Above that, derate linearly: 375 A at 55 °C, 350 A at 60 °C, 325 A at 65 °C, and 300 A at 70 °C. If the breaker lives in a sealed, uncooled enclosure near a transformer or drive, the 55 °C column is the one to size against. The 110 mm depth and 138 mm width fit a standard MCCB footprint — verify the gland plate cutout against the 248 mm height before laying out the backpanel.
Trip unit and auxiliary configuration
The ETU550 is an electronic trip unit with LSI protection curves (long-time, short-time, instantaneous). It supports communication via the integrated communication function — this is the variant that talks to a PLC or BMS, not a standalone thermal-magnetic. The breaker ships with four auxiliary switches (HQ type) for status feedback to the control system. No undervoltage release or shunt trip is included; those are ordered separately as the 3VA9608-0BB11 auxiliary trip.