The SENTRON 3VA2340-7HN32-0BL0 is a 3-pole molded case circuit breaker (MCCB) rated for 400 A continuous current, built for line protection in industrial distribution panels. It carries a full-rated current of 400 A all the way up to 50 °C ambient, then derates stepwise to 340 A at 70 °C — so in a hot panel you still get nearly full rating. Breaking capacity is 330 kA at 240 V, 242 kA at 415/440 V, 187 kA at 500 V, and 7.5 kA at 690 V. That 242 kA at 415 V is what you need for a high-fault utility feed in a plant main; the 690 V number drops off sharply, so this isn't your breaker for a 690 V motor branch without checking the available fault current.
Built-in auxiliaries and releases — what's inside the case
This breaker ships with a factory-fitted set of auxiliary switches: 2 auxiliary switches, 1 trip alarm switch, and 1 electrical alarm switch (HQ type). It also includes an undervoltage release (UVR). That means you get remote status and trip indication out of the box — no separate accessory ordering for basic panel feedback. The UVR will drop the breaker if control voltage is lost, which is standard for emergency-stop or undervoltage protection schemes.
Panel fit and handling
Dimensions are 110 mm deep, 138 mm wide, 248 mm tall.