Siemens 5SY6004-7KV26 MCB, 230V 6kA, 1+N, C4A, 70mm

The 5SY6004-7KV26: The 6 kA breaking capacity at 230 V is the standard domestic and light-commercial fault level for this class — it safely interrupts a short-circuit current up to 6 kA without welding the contacts or damaging the busbar. The C-curve (4 A) means the magnetic trip activates at 5–10 times rated current, so it's sized for moderate inrush loads like small motors or lighting banks; a B-curve would trip faster on lower surges, but C-curve avoids nuisance trips on capacitor or transformer inrush. The 1+N-pole construction switches both phase and neutral, but the neutral pole is not protected — it's a switched neutral, not a monitored pole. Depth of 70 mm is the standard 2-module width for a 1+N MCB on a DIN rail; verify your enclosure depth if you're retrofitting into a shallow cabinet.