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. That 187 kA figure at 240 V means this breaker handles high-fault utility feeds or transformer secondaries without cascading upstream — it's sized for main or tie positions where available fault current is substantial. 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. In a hot panel — say, adjacent to a drive or inside a non-ventilated enclosure — the 55 °C figure is the one to size against.
Dimensions and Panel Fit
Dimensions are 248 mm high, 184 mm wide, 110 mm deep. 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. Operating temperature range is -25 °C to +70 °C, storage from -40 °C to +80 °C. The storage floor matters if this breaker sits in an unheated warehouse before installation.
Auxiliary and Trip Indication
The breaker ships with 2 auxiliary switches plus 1 trip alarm switch (HP type) fitted. It has a trip indicator and no undervoltage release or ground-fault monitoring module. The basic switch variant is 3VA2340-5HN42-0AA0.
Sourcing and Lifecycle
This is an active, current-production part. Sourced to order through independent distribution; availability and current pricing are confirmed at quote time against an RFQ.