400 A continuous, flat derating to 70°C
That flat thermal response simplifies coordination: the breaker's continuous rating is the same at the top of its operating range as at the bottom, per the datasheet.
Breaking capacity across voltage classes
Interrupting capacity is specified per voltage: 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 9 kA at 690 V. The 240 V figure is among the highest in the 3VA2 frame class — useful for high-fault utility service entrances or transformer secondaries where available fault current exceeds 100 kA.
Motor protection design with integrated undervoltage release
This MCCB is designated for motor protection, meaning its trip curve and thermal memory are tuned for motor starting inrush and locked-rotor conditions. The factory-fitted undervoltage release (UVR) drops the breaker when control voltage falls below the dropout threshold, standard for safety circuits that need to guarantee a power disconnect on loss of control power.
That depth is the front-to-back panel footprint including the handle and terminal covers. The 138 mm width is the 3-pole frame width; adjacent breakers in a multi-unit lineup will need the side-to-side clearance per Siemens' installation instructions.