What this breaker carries
The Siemens 3VA2463-5KP32-0AL0 is a 630A IEC frame circuit breaker from the 3VA2 series, rated at 55kA Icu at 415V AC — Breaking Capacity Class M. That Icu means it can safely interrupt a 55kA fault current without self-destruction, giving you selectivity headroom downstream for feeder panels or motor control centers. The ETU850 trip unit gives you LSI protection: Long-time pickup Ir adjustable 250A through 630A, short-time pickup Isd from 0.6x to 9x In, and instantaneous Ii from 1.5x to 9x In. That range covers motor-start inrush and transformer magnetizing peaks without nuisance tripping — set the Isd delay to coordinate with downstream breakers.
Line-down fit and auxiliaries
This unit ships with two auxiliary changeover switches and one trip alarm changeover switch pre-installed — no separate order for alarm contacts. The nut keeper kit is included, so you're not hunting for cage-clamp retainers during a panel swap. Neutral conductor protection is optional via an external current transformer, up to 160% of In. Mounts on the standard DIN rail or bolted into the switchboard. The 3VA2 frame footprint matches existing 3VA1 cutouts in most Siemens panels — verify gland plate clearance if retrofitting into a legacy cubicle.