What this breaker carries
The Siemens 3VA1163-5MH36-0BH0 is a 3-pole IEC frame 160 molded-case circuit breaker rated 63 A continuous, with a breaking capacity class M of Icu=55 kA at 415 V AC. That 55 kA figure means it can safely interrupt a fault current up to that level without welding contacts or rupturing the case — essential for high-fault panels downstream of a large transformer. It ships with a TM120M thermal-magnetic trip unit configured for starter protection: no overload protection (the starter handles that), just short-circuit protection adjustable from 5 to 15 times In (315–945 A magnetic pickup). The undervoltage release (UVR) operates on 24 V DC — if that control voltage drops, the breaker trips instantly, which is standard for emergency-stop or safety-hold circuits. Auxiliary switching comes as two HQ form-C contacts plus one HQ trip-alarm switch, all wired via clamp terminals. The UVR coil draw is modest; verify your 24 V DC supply can hold the coil continuously — typical hold current for this class is under 2 A, but check the coil rating on the nameplate.
Panel fit and wiring
Mounts on a standard DIN rail or panel-mount base — the 3VA1 frame is the same footprint as the older 3VL series, so retrofitting into an existing Siemens MCCB cutout is straightforward. Clamp terminals accept copper or aluminum conductors; torque to the values stamped on the breaker face. The UVR and auxiliary switches are factory-installed — no field-kit wiring needed.