The SENTRON 3VM1332-4ED42-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated for line protection, carrying 320 A continuously at 40 °C with no derating needed up to 50 °C. At 240 V it interrupts 121 kA — that's the headline SCCR figure for this frame. The TM210 thermal-magnetic release handles the overcurrent curve, no undervoltage release or ground-fault monitoring on this version.
What the interrupting ratings mean for your panel
At 240 V this breaker clears 121 kA — that's a very high interrupting capacity for a 320 A frame, meaning it can sit upstream of a high-fault transformer or a large motor bank without needing a current-limiting fuse ahead of it. At 415 V and 440 V it still holds 76 kA; at 500 V it drops to 53 kA. The SCCR at each voltage level determines whether this breaker alone satisfies the fault rating for the whole panel or you need upstream coordination. The continuous current holds flat at 320 A from 40 °C through 50 °C — no derating in a warm enclosure. Above 50 °C it steps down: 313 A at 55 °C, 306 A at 60 °C, down to 292 A at 70 °C. If the breaker lives in a hot switchroom or next to other heat sources, that 70 °C figure might be the limiting number for your load schedule.
Panel fit and integration
The 3VM1332-4ED42-0AA0 measures 248 mm high, 184 mm wide, and 110 mm deep — a 4-pole frame that fits standard distribution panel cutouts. IP40 on the front means it's protected against tools and wires dropping in, but not against hose-down; keep it inside the enclosure, not on a washdown wall. Rated insulation voltage is 800 V, operating voltage 690 V AC, so it's comfortable on 400/480 V systems with headroom. Power loss at full load is 80 W maximum — that's heat that has to leave the enclosure. In a sealed panel with multiple breakers, factor that into your thermal budget or you'll hit the derating curve sooner than the ambient temperature alone suggests.