The Siemens 5SL3606-6 is a SENTRON 5SL3 miniature circuit breaker, 4-pole (3P+N), rated 6 A with a B tripping characteristic. It breaks faults up to 4.5 kA per EN 60898 and IEC 60947-2 at 400 V AC — that's the standard for residential and light commercial distribution boards where the prospective short-circuit current stays under that threshold.
The 4-pole 3P+N configuration switches all three phases plus the neutral — that's the right choice for a TN or TT system where you need to isolate the neutral on a fault. The neutral pole is switched, so it opens the neutral path when the breaker trips, which matters for safety isolation in some regional codes. The B curve is the most common for residential and general-purpose final circuits in Europe — lighting, socket outlets, small appliances. If you were protecting motor circuits or transformers with higher inrush, you'd want a C or D curve instead; this one is not for that. The 4.5 kA breaking capacity is the standard domestic rating per EN 60898; for industrial panels with higher fault current you'd step up to a 10 kA or 15 kA rated MCB.
The terminals accept solid or stranded copper from 0.75 mm² up to 25 mm², which covers standard final-circuit conductors up to 4 mm² and still handles a 6 mm² feed if needed. Tightening torque is 2.5 to 3 N·m — a standard screwdriver setting, no special tooling. It's also sealable — you can lock the toggle with a padlock for lockout/tagout.