What this 3VA2440-5HN32-0KL0 is and what it does
The Siemens SENTRON 3VA2440-5HN32-0KL0 is a 3-pole molded case circuit breaker (MCCB) rated for 400 A continuous at 40 °C through 70 °C, meaning no derating across the full operating temperature range — a rare flat curve that simplifies panel design. It is designed for line protection, so its primary job is to protect cables and busbars against overload and short circuit, not motor or generator circuits. The breaker carries a 121 kA interrupting rating at 415 V, which is the standard industrial distribution voltage in many markets; that figure tells you it can safely clear faults up to that level without upstream fuses or a larger breaker.
Breaking capacity across voltages — where it fits
This MCCB delivers 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 9 kA at 690 V. The steep drop at 690 V means it is not intended for 690 V main feeders; at that voltage you are limited to 9 kA, which is fine for sub-distribution but not for high-fault service-entrance duty. The 121 kA at 415 V puts it in the high-interrupting range for a 400 A frame — suitable for switchboards and large panelboards where fault current is high.
Panel fit and auxiliary configuration
Footprint is 138 mm wide, 248 mm high, 110 mm deep — a standard 3-pole MCCB size that fits most DIN-rail or panel-mount enclosures without special adapters. The breaker ships with a shunt trip (STL) for remote tripping, plus 2 auxiliary switches, 1 trip alarm switch, and 1 electrical alarm switch (HQ configuration), giving you four discrete signal outputs for status monitoring. No undervoltage release and no ground-fault monitoring on this variant.