What this 3VA2 MCCB carries
The Siemens SENTRON 3VA2340-5HN32-0JL0 is a 3-pole molded case circuit breaker rated for 400 A continuous current — no derating needed up to 50 °C, where it still holds the full 400 A. Above that, it steps down in 15 °C increments: 385 A at 55 °C, 370 A at 60 °C, 355 A at 65 °C, and 340 A at 70 °C. That thermal curve is what you use for panel sizing, not the nameplate number. Interrupting capacity runs 187 kA at 240 V, drops to 121 kA at 415 V and 440 V, then 75.6 kA at 500 V, and 7.5 kA at 690 V. That 187 kA figure at 240 V tells you it's built for high-fault industrial panels — not a light-duty distribution breaker. It's set up for line protection with a shunt trip release (STL) and carries 2 auxiliary switches plus a trip alarm and an electrical alarm switch. No undervoltage release, no ground-fault monitoring, no communication module — this is a straightforward power breaker, not a smart unit.
Panel fit and mounting
The breaker measures 248 mm high, 138 mm wide, and 110 mm deep — that depth is the dimension to watch when you're laying out the gland plate or enclosure depth. It's a standard SENTRON 3VA2 footprint, so if you've got a 3VA2 frame in the panel already, this drops into the same mounting pattern. Operating temperature range is -25 °C to 70 °C, storage from -40 °C to 80 °C. Maximum power loss is 96 W — that's the heat you need to vent in a sealed enclosure.
Compliance and documentation
As a SENTRON 3VA2 series MCCB, it carries the usual Siemens compliance package — UL 489, IEC 60947-2, CSA C22.2 No. 5. RoHS and REACH declarations are available with the product documentation. The basic switch variant is 3VA2340-5HN32-0AA0 if you need the core breaker without the auxiliary switch package.