Siemens 3VA2340-5HN42-0AJ0 — 400 A SENTRON MCCB for Line Protection
Breaking capacity is the headline: 187 kA at 240 V AC, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 7.5 kA at 690 V. Thermal derating is published across the operating range: full 400 A up to 50 °C, then 385 A at 55 °C, stepping down to 340 A at 70 °C.
The 184 mm width on a 4-pole MCCB is standard for this frame class — verify the existing mounting footprint if retrofitting into a panel that held a different manufacturer's 4-pole unit, but the depth of 110 mm is shallow enough to clear most gland plates and back-panel wiring troughs. Maximum power loss is 96 W at rated current. That's a non-trivial heat source inside a sealed enclosure; factor it into the thermal budget alongside drives and contactors.
Auxiliary and Trip Indication
The basic switch variant is 3VA2340-5HN42-0AA0.
This is an active, current-production part.