What it is — and what the ratings mean for fit
The Siemens 3VA1163-5MH32-0BH0 is a 3-pole IEC frame 160 molded-case circuit breaker with a 63 A rating and a 55 kA breaking capacity at 415 V (class M). That Icu figure — 55 kA at 415 V — means it safely interrupts fault currents up to that level without welding contacts or cascading upstream, which is the deciding spec for panel SCCR compliance under IEC 60947-2. The TM120M thermal-magnetic trip unit provides starter protection: the thermal element tracks motor heating, the magnetic pickup is adjustable 5–15 x In for short-circuit-only protection (no overload function on this variant). The built-in undervoltage release (UVR) at 24 V DC drops the breaker on control-voltage loss — typical for emergency-stop or safety circuits where a voltage-monitored coil holds the mechanism closed.
Deployment context — where this lands in a panel
This breaker mounts on a DIN rail or panel plate inside a distribution or motor-control center. The nut keeper kit holds the busbar or cable lugs in place during vibration — a detail that matters on machine-tool or conveyor panels where transport rattles loosen terminations. The two auxiliary switches HQ and the trip alarm switch HQ give the PLC or safety relay a dry-contact status: one NO/NC pair for breaker position, one for fault trip. The 24 V DC UVR coil pulls about the same inrush as a small relay; verify your 24 V DC supply can hold the dropout threshold (typically 70–35 % of rated voltage) without browning out other loads on the same loop.