Its interrupting capacity reaches 330 kA at 240 V, 242 kA at 415 V and 440 V, 187 kA at 500 V, and 52.5 kA at 690 V — figures that cover most industrial service-entrance and feeder applications. The ETU320 electronic trip unit handles line protection (no ground-fault or communication module). This is a 3-pole, panel-mount MCCB with a depth of 110 mm, width of 138 mm, and height of 248 mm — dimensions that matter when swapping into an existing SENTRON or third-party MCCB bucket. Maximum power loss is 96 W, so ventilation in the enclosure should account for that thermal load at full rating.
Thermal derating and endurance
Above that, it derates: 385 A at 55 °C, 370 A at 60 °C, 355 A at 65 °C, and 340 A at 70 °C.
In a 480 V panel with a transformer-fed bus that can deliver 200 kA, this breaker has headroom. The ETU320 release is an electronic trip with fixed time-current curves; it does not offer communication or ground-fault detection, so if your spec requires those, you need a different release variant in the 3VA2 family.