Panel fit and protection profile
At 18 mm wide (1 modular unit), it snaps onto DIN rail and occupies one slot in a distribution board.
The D-curve is the key selection gate here. Standard C-curve breakers trip at 5–10× In; D-curve shifts that to 10–20× In, so a 6 A D-curve won't nuisance-trip on the magnetizing inrush of a small control transformer or a 1.5 kW motor start. If your load is resistive (heaters, lighting) or has a low inrush, a C-curve sibling is cheaper and more selective — but for inductive kick, this D-curve is the right call. The 1-pole form breaks only the line conductor — neutral is not switched, which is standard for single-phase branch circuits where the neutral is bonded.
The 5SN4106-8CN carries a current lifecycle stage, meaning Siemens has not flagged it for discontinuation. It remains a standard catalog item in the SENTRON 5SN4 series. No official successor has been issued; the 5SN4CN design is the active generation.
Integration notes
The 18 mm width (1 MW) means it fits standard distribution boards without crowding. Terminals accept 0.75 mm² to 25 mm² — solid or stranded — which covers most branch-circuit wiring up to 6 mm² for a 6 A load.