The Siemens SENTRON 3VA2340-5JQ32-0DC0 is a 3-pole molded case circuit breaker rated for line protection, carrying a full-scale current of 400 A and a maximum breaking capacity of 187 kA at 240 V. It includes an integrated undervoltage release and two auxiliary switches HQ, making it a ready-to-install unit for distribution panels where undervoltage protection is required by code or design.
Breaking capacity and thermal derating
Breaking capacity drops with system voltage: 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 7.5 kA at 690 V. The continuous current rating holds at 400 A from 40 °C through 50 °C, then derates to 375 A at 55 °C, 350 A at 60 °C, 325 A at 65 °C, and 300 A at 70 °C. For a panel running at 55 °C ambient, the breaker is good for 375 A continuous — plan the load accordingly.
Mounting and dimensions
The breaker measures 248 mm high, 138 mm wide, and 110 mm deep — a standard MCCB footprint for panel-mount installation. The 3-pole design with undervoltage release and auxiliary switches occupies the same cutout as the base 3VA2 frame, so it drops into existing SENTRON panel layouts without rework.