What it is and what it does
The Siemens 3VA2340-7HL32-0KH0 is a SENTRON molded case circuit breaker (MCCB) rated for 400 A continuous current, with a 3-pole configuration and an ETU320 electronic trip unit. It's built for line protection — think main feeder or large motor branch in an industrial panel. The 330 kA breaking capacity at 240 V tells you it can handle high-fault scenarios without cascading upstream; that's the kind of SCCR headroom a site electrical engineer wants for coordination studies.
Breaking capacity across voltages
Breaking capacity drops as voltage climbs: 330 kA at 240 V, 242 kA at both 415 V and 440 V, 187 kA at 500 V, and 52.5 kA at 690 V. That's a steep derate above 500 V — if your panel runs at 690 V, the 52.5 kA figure is the one that governs your fault-current rating, not the headline 330 kA.
Thermal derating and power loss
Rated 400 A up to 50 °C ambient; above that it derates to 385 A at 55 °C, 370 A at 60 °C, 355 A at 65 °C, and 340 A at 70 °C. Maximum power loss is 96 W — that's the heat you need to vent in a closed panel. The operating range spans -25 °C to 70 °C, storage from -40 °C to 80 °C. Dimensions are 110 mm deep, 138 mm wide, 248 mm high — fits standard MCCB mounting footprints.
Trip unit and auxiliary options
The ETU320 overcurrent release is electronic, with a shunt trip (STL) auxiliary release built in. It ships with 2 auxiliary switches plus 1 trip alarm switch (HQ configuration). The basic switch is order code 3VA2340-7HL32-0AA0, and the integrated auxiliary trip is 3VA9688-0BL33. No undervoltage release, no ground-fault monitoring, no communication module — this is a straightforward line-protection breaker.