The Siemens 5SY3004-7 is a SENTRON miniature circuit breaker rated 4 A with a C-curve tripping characteristic, 4.5 kA breaking capacity per EN 60898 at 230 V AC. It switches the line and neutral (1P+N), with the neutral pole switching as a switched neutral — not just a solid link.
Snaps onto standard rail (EN 60715) and occupies one width unit (18 mm). Mounting position is any, so no derating for horizontal or inverted orientation in a crowded gland plate.
What the C-curve and 4.5 kA mean for your BOM
If your panel's SCCR calculation requires a higher interrupting rating, the 5SY6 series (e.g. 5SY6020-7KL) offers 6 kA at the same 18 mm footprint, same depth, same neutral-switching function — a drop-in upgrade without rewiring the busbar.
