The Siemens SENTRON 3VA2440-0MS32-0AA0 is a 3-pole molded case circuit breaker (MCCB) rated for 400 A continuous current, designed specifically for motor protection with an ETU310M electronic overcurrent release. Its interrupting capacity hits 440 kA at 415 V and 187 kA at 690 V, meaning it can clear a massive fault without the arc flash escalating — critical for high-fault panels feeding motor control centers. The adjustable trip range spans 600 A to 5 200 A, so you can dial it in for the motor's locked-rotor current without swapping the breaker body.
Mounts in a standard panel on a DIN rail or bolted bus — footprint is 138 mm wide, 248 mm tall, 110 mm deep, which is a common 3-pole frame size for this class. Front face is IP40 rated, fine for clean indoor switchgear; no washdown protection, so keep it out of wet environments. Operates from -25 °C to 70 °C ambient, and the current rating holds at 400 A all the way up to 70 °C — no derating needed in a warm panel.
What the trip unit means for the job
No undervoltage release, no phase-failure detection, no communication function built in — this is a standalone thermal-magnetic replacement for a motor starter feeder.