What this MCCB carries and where it fits
The Siemens SENTRON 3VA2340-6HL32-0KA0 is a 3-pole molded case circuit breaker rated for 400 A continuous current at 40 °C, with an adjustable thermal-magnetic trip range spanning 600 A minimum to 4000 A maximum — so it covers feeder and large motor branch protection where the load current sits below 400 A but fault currents can climb. Breaking capacity runs 242 kA at 240 V, 187 kA at 415/440 V, 121 kA at 500 V, and 7.5 kA at 690 V; that SCCR headroom means it can sit upstream in a high-fault panel without cascading to the main breaker. The shunt trip release (STL) allows remote tripping from a safety circuit or emergency-stop chain. It is designed for line protection (not motor-only or generator duty), and the basic switch variant is 3VA2340-6HL32-0AA0 — the -0KA0 suffix adds the shunt trip. No undervoltage release, no ground-fault monitoring, no auxiliary switch fitted on this order code. The 3VA family sits in the SENTRON molded-case platform, common across IEC and UL panels for distribution and industrial feeder protection.
Thermal derating and panel heat budget
The 400 A rating holds from 40 °C through 50 °C ambient. At 55 °C it derates to 385 A, at 60 °C to 370 A, at 65 °C to 355 A, and at 70 °C to 340 A. Maximum power loss is 96 W — that heat has to be considered in the enclosure thermal calculation, especially when multiple breakers are ganged in a sealed panel. Operating ambient range is -25 °C to 70 °C; storage range -40 °C to 80 °C.
Physical fit and panel integration
Dimensions are 248 mm height, 138 mm width, 110 mm depth. The 3-pole body mounts on a standard DIN rail or direct panel-mount via the screw terminals. The 110 mm depth (4.33 in) is within the envelope of most 200 mm deep distribution enclosures, but verify clearance for the shunt trip wiring and any auxiliary accessories that plug into the side slots.