The Siemens 5SL4304-6 is a 3-pole miniature circuit breaker from the SENTRON 5SL series, rated 4 A with a B tripping characteristic. It interrupts fault currents up to 10 kA per EN 60898 and IEC 60947-2 at 400 V AC — that's the standard residential and light-commercial short-circuit rating, so it coordinates with typical upstream 10 kA-rated main breakers without needing a current-limiting device.
At 3 modular width units (54 mm wide) and 70 mm installation depth, it leaves room for auxiliary contacts or shunt trips on the right-side accessory slot — the product extension is supported per the spec.