400 A MCCB with shunt trip — SENTRON 3VA2440-6HN32-0KA0
The Siemens SENTRON 3VA2440-6HN32-0KA0 is a 3-pole molded case circuit breaker (MCCB) rated for 400 A continuous current across the full 40–70 °C ambient range — no derating needed up to 70 °C. Breaking capacity is 242 kA at 240 VAC, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 9 kA at 690 V — per the datasheet. That 242 kA at 240 V is the headline figure; at 415/440 V the 187 kA still covers most industrial fault levels.
Dimensions are 248 mm height, 138 mm width, 110 mm depth.
Key ratings and thermal performance
Maximum power loss is 63.5 W. The 400 A rating is the same at every 5 °C step from 40 to 70 °C, which simplifies panel thermal calculations.
Built-in shunt trip release
No auxiliary switch is fitted; if status feedback is needed, a separate auxiliary switch module must be added.