The Siemens 3VA1163-5MH36-0CC0 is a 3-pole IEC frame 160 molded-case circuit breaker with a 63 A rating and a 55 kA interrupting capacity at 415 V AC — that's the 'M' breaking capacity class, meaning it handles high fault currents typical of industrial distribution panels without needing an upstream current-limiting fuse. The TM120M thermal-magnetic trip unit provides fixed thermal protection (the 'TM' part) and adjustable magnetic pickup from 5 to 15 times In, so you set the short-circuit threshold to match the inrush of your motor or transformer load. No overload relay function here — this is a short-circuit-only protector for a starter circuit, not a combination motor starter.
The clamp terminals accept copper or aluminum conductors up to the frame's rated cross-section — no lug kit needed for most panel builds.