The Siemens 5SL6306-6 is a SENTRON miniature circuit breaker rated 6 A at 400 V AC with a B tripping characteristic and 6 kA breaking capacity per EN 60898. It's a 3-pole unit in a 3-module-width housing (54 mm), designed for residential and infrastructure branch-circuit protection where the B-curve handles resistive and light inductive loads without nuisance tripping from inrush.
The B-curve (3-5 In) trips fast on short circuits but holds through normal motor-start inrush for small pumps or fans; it's the standard choice for general-purpose lighting and socket circuits. Thermal derating is published: at 40 °C ambient the continuous rating drops to 5.64 A, at 55 °C to 5.04 A. The breaker mounts in any position and fits a standard DIN rail with 70 mm installation depth.
Sealable terminals are provided, which matters for utility-metering or rental applications where tamper evidence is required. Halogen-free and silicon-free construction meets low-smoke material specs for public-building installations.