63 A D-curve MCB for high-inrush loads
The Siemens 5SL4163-8CC is a 1-pole miniature circuit breaker rated 63 A with a D tripping curve, breaking 10 kA at 230/400 V.
Active, no end-of-life worry
Lifecycle status is Active per Siemens — no PCN, no phase-out date on this code. That means it's still a standard catalog item, specifiable into new designs without a last-time-buy clock. RoHS-compliant since June 2013, with REACH Article 33 disclosure for lead above 0.1% (CAS 7439-92-1) in the current candidate list.
What the 10 kA rating means on the van
If your service entrance has a higher available fault current (say 18 kA or 25 kA upstream), you'd need a current-limiting upstream breaker or a higher-rated MCB. For branch circuits downstream of a 10 kA-rated main, this fits without derating.