The Siemens SENTRON 3VA2440-5HL32-0HL0 is a 3-pole molded case circuit breaker rated for 400 A continuous current (Iu) at ambient temperatures up to 50 °C, with full 400 A rating maintained across 40 °C to 50 °C before derating begins at 55 °C (384 A) and steps down to 360 A at 70 °C. Interrupting capacity hits 187 kA at 240 V AC, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 17 kA at 690 V — so it handles high-fault utility feeds and transformer secondaries without cascading upstream.
Dimensions are 248 mm height, 138 mm width, and 110 mm depth — mounts into standard switchboard or panelboard cutouts for 400 A frame MCCBs. The 3-pole construction fits three-phase distribution. Maximum power loss is 63.5 W, so factor heat dissipation into enclosure sizing if grouping multiple breakers.
Trip unit and auxiliary components
The overcurrent release is the ETU320, an electronic trip unit with LSI protection (long-time, short-time, instantaneous). The shunt trip (STL) design allows remote opening via a control voltage.