The Siemens SENTRON 3VA2440-6HL32-0AA0 is a 3-pole molded case circuit breaker rated for 400 A continuous current at 40 °C through 70 °C — no derating needed across that band, which simplifies panel schedules in warm enclosures. It carries an ETU320 electronic trip unit with an adjustable overload range from 600 A up to 4 800 A, so it covers a wide swath of feeder and main breaker roles without swapping hardware.
Breaking capacity by system voltage
This MCCB delivers 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 9 kA at 690 V. The steep drop at 690 V means it is not a universal high-voltage breaker — at that level it is limited to low-fault locations or downstream of a current-limiting device. For most 400 V-class industrial distribution, the 187 kA figure covers high-capacity transformer secondaries and large motor control centers.
Panel fit and integration
Dimensions are 248 mm high, 138 mm wide, 110 mm deep — a standard 3-pole MCCB footprint that fits Siemens 3VA panelboard and switchboard mounting bases. Rated insulation voltage is 800 V, and maximum power loss is 63.5 W, which should be factored into enclosure thermal calculations if the breaker is enclosed with other high-current devices.
Trip unit and protection design
The ETU320 electronic trip unit is a line-protection design — it does not include ground-fault monitoring or undervoltage release as built. No communication function or voltage trigger is fitted on this variant. The trip indicator is not present, so fault indication relies on the breaker's handle position or an external auxiliary contact.