Siemens 5SY4503-7CV MCB, 15kA Icu 1P+N C3

The 5SY4503-7CV: The C3 curve (thermal-magnetic trip) means it holds through inrush up to about 5–10× rated current before the magnetic trip fires — typical for lighting, resistive loads, or small motor circuits where the start-up surge isn't brutal. The 1P+N pole arrangement switches the phase and disconnects the neutral, so it fits single-phase sub-circuits in a three-phase distribution board where you need neutral isolation. DIN-rail mount, standard 18 mm per pole width, snaps into any enclosure that accepts a 35 mm rail.