Line protection MCCB with ETU320 — 400 A frame, 242 kA at 240 V
The Siemens SENTRON 3VA2440-6HL32-0KH0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, carrying a continuous current Iu of 400 A at 40 °C and holding that rating through 50 °C before a gentle thermal derating curve begins — 384 A at 55 °C, 376 A at 60 °C, 368 A at 65 °C, and 360 A at 70 °C. This means the breaker delivers its full nameplate current across the typical panel ambient range; the derating only matters if you are packing it into a sealed, high-temp enclosure. Breaking capacity is the headline here: 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 40 kA at 690 V. Those are high-interrupting ratings — the 242 kA figure at 240 V covers large transformer-fed fault currents common in industrial switchgear; the 187 kA at 415 V handles most European distribution-level faults without cascading upstream. The overcurrent release is an ETU320 electronic trip unit — adjustable thermal-magnetic or fully electronic depending on the variant, here configured for line protection. A shunt trip (STL) is built in for remote tripping, and the auxiliary contact block carries 2 auxiliary switches plus 1 trip alarm switch (HQ), giving the control system status feedback on breaker position and fault events.
Panel integration — dimensions and mounting
Dimensions: 248 mm height, 138 mm width, 110 mm depth. The 138 mm width is the standard 3-pole MCCB footprint for the SENTRON 3VA platform — fits the same panel cutout and busbar spacing as other 3VA frame breakers. The 110 mm depth includes the arc chamber and termination space; verify clearance behind the panel door for the rotary handle or motor operator if fitted. Maximum power loss is 63.5 W — relevant for thermal management inside a sealed enclosure. The -25 °C to 70 °C operating range covers most indoor industrial environments; storage range extends from -40 °C to 80 °C.
Compliance and documentation
As a Siemens SENTRON product, the 3VA2440-6HL32-0KH0 carries the standard compliance suite: CE marking for the European market, UL/CSA listings for North America (verify the specific UL file number for your jurisdiction), and RoHS/REACH declarations available through Siemens Industry Online Support. The rated insulation voltage Ui is 800 V, confirming suitability for 690 V systems with margin.