What this MCCB delivers
The Siemens 3VA2340-6JP32-0BL0 is a SENTRON molded case circuit breaker rated for 400 A continuous at 40 °C, with a 3-pole configuration and a maximum breaking capacity of 242 kA at 240 V. That 242 kA figure at 240 V means it can safely interrupt a fault current up to that level without cascading upstream — critical for high-fault panels near large transformers or utility feeds. At 415 V and 440 V it still holds 187 kA, and at 500 V it delivers 121 kA; only at 690 V does the rating drop to 7.5 kA, so verify your system voltage against that curve. The continuous current holds flat at 400 A from 40 °C through 50 °C — no derating needed in a typical 40 °C panel. Above that, it 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 enclosure runs hot, size the breaker for the actual ambient, not the nameplate 400 A. This version includes a communication function and an undervoltage release, plus a full auxiliary switch complement: two auxiliary switches, one trip alarm switch, and one electrical alarm switch HQ. The trip indicator gives a local visual flag. The basic switch is order code 3VA2340-6JP32-0AA0.
Panel fit and mounting
The breaker measures 138 mm wide, 248 mm tall, and 110 mm deep. That 110 mm depth is the dimension from the mounting surface to the front of the breaker — critical when the panel door clearance is tight. The 138 mm width and 248 mm height match the standard SENTRON 3VA frame footprint, so it drops into existing cutouts without re-drilling. Rated for line protection, this MCCB is designed for main or feeder duty in distribution panels. The 3-pole form factor suits three-phase systems. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C.