What the 70 kA rating means for your panel
The 3VA1163-6MH32-0AH0 is a Siemens 3VA1 IEC frame 160 circuit breaker with a breaking capacity class H rating of Icu=70kA at 415 V AC. That 70 kA figure is the maximum fault current this 3-pole device can safely interrupt without welding its contacts or rupturing the arc chamber — critical for installations where the available fault current at the panelboard exceeds the standard 25 kA or 36 kA class. The 63 A rated current (In) is set by the TM120M thermal-magnetic release, configured here for starter protection: the thermal element is sized for motor overload curves, and the magnetic short-circuit pickup is adjustable from 5 to 15 times In, giving you a range of 315 A to 945 A instantaneous trip.
Deployment context — what it connects to
The 3VA1 frame mounts on a DIN rail or panel-mount plate inside a motor control center or distribution board. It ships with a nut keeper kit for the busbar connections, plus two auxiliary switches (HQ type) and one trip alarm switch (HQ type) — so you get remote status feedback without adding a separate accessory block. The TM120M release is a dedicated motor-protection curve, meaning the thermal element tracks the heating characteristic of a motor winding rather than a generic cable. If you are using this as a motor branch-circuit protector, pair it with a separate overload relay (the description notes 'without overload protection' — the TM120M handles short-circuit only, not running overload).