MCCB for 400 A feeder protection
With a maximum frame rating of 4 000 A and a minimum setting of 600 A, this breaker covers heavy feeder and main-switch duty. At 690 V the interrupting rating drops to 7.5 kA, so verify the system voltage against the curve.
Thermal derating and power dissipation
This MCCB holds 400 A continuously 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. Maximum power loss is 98.5 W — that heat stays inside the enclosure, so factor it into the panel thermal budget.
Integrated auxiliary and release options
The trip indicator is present, and the trip unit is adjustable from 80 A to 400 A full-scale, with no voltage-trigger function.
Dimensions: 248 mm high, 184 mm wide, 110 mm deep. That's a 4-pole MCCB footprint — roughly 7.24 × 9.76 × 4.33 inches. The base switch variant is 3VA2340-5JQ42-0AA0, meaning this -0DH0 version adds the aux switches and UVR as factory-fitted options.