The Siemens 3VA2340-6HL32-0AH0 is a SENTRON 3VA2 molded case circuit breaker rated for 400 A continuous current (Iu) from 40 °C up through 50 °C ambient — no derating needed in a warm enclosure until you cross 55 °C. At 240 V it interrupts 242 kA, at 415 V and 440 V it holds 187 kA, and it still clears 121 kA at 500 V. That's a high-interrupting capacity frame for fault currents that would weld a standard MCCB's contacts shut.
Trip unit and protection logic
It's a line-protection breaker, not a motor-protection device.
It measures 138 mm wide, 248 mm tall, 110 mm deep — that's a three-pole frame that eats a full 138 mm of rail width, so plan your enclosure layout accordingly. At full 400 A load the maximum power loss is 96 W. That heat has to leave the enclosure; in a sealed stainless box you'll need forced ventilation or a bigger cabinet. IP40 on the front means tools and fingers stay out, but the body isn't sealed against dripping water — keep it inside the panel.