What this MCCB delivers for the line
The Siemens SENTRON 3VA2340-5KP32-0CC0 is a 3-pole molded case circuit breaker rated for 400 A continuous at 40 °C, with a maximum breaking capacity of 187 kA at 240 V and 121 kA at 415 V — enough headroom to clear high-fault faults without cascading upstream on a 400 V distribution bus. It carries a communication function for integration into a plant-wide monitoring system, plus an integrated undervoltage release (UVR) that drops the breaker if control power is lost — a common requirement for emergency-stop chains and safety circuits. Rated for line protection duty, this MCCB is sized to protect a 400 A feeder or a large motor branch circuit, and the 3-pole design handles three-phase loads common in industrial panels.
SCCR and thermal derating — the numbers that decide fit
Breaking capacity drops from 187 kA at 240 V to 121 kA at 415/440 V, then to 75.6 kA at 500 V and 7.5 kA at 690 V. That 690 V figure is the hard ceiling — verify your system's available fault current at the point of installation. Thermal derating is flat at 400 A from 40 °C through 50 °C, then steps down: 375 A at 55 °C, 350 A at 60 °C, 325 A at 65 °C, and 300 A at 70 °C. If your panel ambient runs above 50 °C, that derating curve governs the real ampacity. Power loss at rated current is 98.5 W maximum — a factor for enclosure heat-rise calculations if the panel is tightly packed.
Panel fit and auxiliary equipment
Dimensions are 248 mm high, 138 mm wide, 110 mm deep — a standard SENTRON 3VA frame that fits most industrial MCCB panel cutouts and bus-bar arrangements. Comes with two HQ auxiliary switches and an undervoltage release pre-installed. The base switch version is 3VA2340-5KP32-0AA0, and the UVR is field-replaceable if needed. No ground-fault monitoring module is included (specified as 'without'), so if GF protection is required, an external module or a different variant is needed. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C — suitable for unheated warehouses and most plant-floor environments.