The Siemens 5SL6625-8CC is a 3+N-pole miniature circuit breaker (MCB) with a D-trip curve, rated 25 A at 400 V AC with a 6 kA breaking capacity.
Snap-on DIN rail mount, standard 1-module width per pole (so 4 modules for the 3+N assembly). The neutral pole is switched, not just solid — verify your distribution board's neutral bar arrangement. Terminal capacity accepts up to 25 mm² conductor; torque to the Siemens recommended value (typically 2.5–3.0 Nm for this class). The D-curve's magnetic trip threshold is 10–20 × In, so it will hold a motor starting current of 6–8 × FLA without tripping, but coordination with downstream protection (RCD, contactor) should be checked during commissioning.