Siemens 5SJ4214-8HG42 — SENTRON 2-pole MCB, D-curve
Rated 400 V AC and 60 V DC — the AC figure is the line-to-line voltage for a 2-pole breaker on a 230/400 V system; the DC rating is lower because DC arcs are harder to extinguish. The D-curve trips magnetically between 10× and 20× In, so it's sized for loads with a high starting surge. Vibration resistance tested to 50 m/s² at 25–150 Hz and 60 m/s² at 35 Hz (4 s) — relevant if this breaker goes into a mobile or machine-mounted enclosure.
Width is 36 mm (2 modular units), depth 70 mm, height 121 mm. Mounting position any, so you can orient it vertically or horizontally in the panel. Sealable, halogen-free, silicon-free — relevant for clean-room or food-line panels where outgassing matters.