Siemens 3VA2340-5HL42-0CC0 — 400 A SENTRON MCCB with Adjustable Trip and Undervoltage Release
The Siemens 3VA2340-5HL42-0CC0 is a SENTRON molded case circuit breaker (MCCB) rated for line protection, carrying 400 A continuous current at 40 °C through its 4-pole frame. Its adjustable thermal-magnetic trip unit spans 600 A minimum to 4 000 A maximum, so you set the pickup to match the feeder or main — not a fixed-value breaker. Breaking capacity hits 187 kA at 240 V and still holds 121 kA at 415 V and 440 V, dropping to 75.6 kA at 500 V and 7.5 kA at 690 V; that 187 kA at 240 V tells you it handles high-fault utility feeds without cascading upstream.
What the Ratings Mean for Your Panel
The 400 A continuous rating holds flat from 40 °C through 50 °C — no derate needed in a warm enclosure. Above that, it steps down: 385 A at 55 °C, 370 A at 60 °C, 355 A at 65 °C, 340 A at 70 °C. If your panel ambient hits 55 °C, you lose 15 A of headroom; plan the load accordingly. The 4-pole construction means it switches all three phases plus neutral, common for main disconnects in 3-phase 4-wire systems or generator feeds. Power loss maxes at 98.5 W — negligible for most enclosures but worth a glance if you're packing multiple breakers in a sealed box. This MCCB ships with an undervoltage release (UVR) and two auxiliary switches (HQ type) pre-installed. The UVR trips the breaker when supply voltage drops below a threshold — safety interlock for motor starters or emergency-stop circuits that need a guaranteed disconnect on power loss. The two auxiliary switches give you remote status feedback (open/closed) to a PLC or indicator lamp without adding a separate accessory block.
Panel Integration — Dimensions and Mounting
The breaker measures 248 mm high, 184 mm wide, and 110 mm deep. That 110 mm depth is the body only — add clearance for the handle throw and rear terminals. It mounts via the standard MCCB footprint (bolt-on or plug-in base, depending on the panel design). The 184 mm width for a 4-pole frame is typical for this class; check your gland-plate cutout or bus-bar spacing before committing the layout. Operating range spans -25 °C to 70 °C ambient, storage from -40 °C to 80 °C.