What it is and what it does
The Siemens 3VA1063-2ED42-0AA0-ZD00 is a 4-pole IEC frame 100 circuit breaker with a fixed 63 A thermal-magnetic trip unit (TM210, FTFM). It carries a breaking capacity of 16 kA at 415 V (class B), meaning it can safely interrupt fault currents up to that level without upstream cascading — sized for distribution panels and motor feeder circuits where the available fault current sits in that range.
Key ratings and what they mean for fit
Overload protection is fixed at Ir = 63 A (no adjustment range), and short-circuit protection is fixed at Ii = 10 × In (630 A magnetic pickup). That fixed curve suits applications where the load current is well-defined and won't change — think a dedicated pump, compressor, or lighting panel. The N conductor is unprotected (solid neutral), so this breaker is for 3-phase + N systems where the neutral is not expected to carry fault current. The nut keeper kit is included for DC Power OEM builds in China — a factory-fit detail that saves a sourcing step if you're assembling panels for that market. The 4-pole form factor occupies four DIN-rail module widths; plan the enclosure fill accordingly.