The Siemens SENTRON 3VA2340-6JP32-0HC0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, carrying 400 A continuous at 40 °C and delivering a breaking capacity of 242 kA at 240 V AC. That 242 kA figure at 240 V means it can interrupt a fault current up to that level without cascading upstream — critical for high-fault installations like transformer secondaries or large motor control centers where the available short-circuit current is substantial.
Breaking capacity across voltages
The breaking capacity drops as voltage rises: 187 kA at 415 V and 440 V, 121 kA at 500 V, and 7.5 kA at 690 V. At 690 V the rating is modest, so if your panel runs a 690 V bus, verify the available fault current stays under that 7.5 kA — otherwise you need a higher-rated frame or upstream current-limiting fuse.
Thermal derating curve
This MCCB holds its full 400 A rating up to 50 °C ambient. Above that it derates linearly: 375 A at 55 °C, 350 A at 60 °C, 325 A at 65 °C, and 300 A at 70 °C. If the breaker lives in a warm enclosure — say adjacent to transformers or drives — factor that derating into your continuous load calculation. The maximum power loss at rated current is 96 W, which contributes to the internal heat rise.
Dimensions and panel fit
The breaker measures 138 mm wide, 248 mm tall, and 110 mm deep. That 110 mm depth is the body only — allow clearance for cable lugs, the shunt trip (STL) accessory, and the two auxiliary switches HQ that ship with this variant. The 3-pole footprint is standard for SENTRON 3VA2 frames; if you are retrofitting into an existing panel that held a 5SQ2370-2YA05 or similar MCCB, check the mounting hole pattern and bus bar spacing — the 3VA2 uses a different rear-connection layout than the older 5SQ series.
Built-in accessories and options
Includes shunt trip (STL), two HQ auxiliary switches, and communication function. No undervoltage release, no ground-fault monitoring, no trip indicator.