The Siemens 5SL7406-3RC is a 4-pole miniature circuit breaker from the SENTRON 5SL series, rated at 6 A with a K tripping characteristic and a 15 kA breaking capacity.
The K characteristic — magnetic trip at 8 to 12× In — is the key differentiator here: it's the right choice for motor branch circuits, welding equipment, and transformer primaries where the inrush peak would pop a B-curve breaker. Four poles let it switch all three phases plus neutral in a single module, saving DIN rail space versus ganging single-pole units.
Panel integration
The 4-pole body is 72 mm wide (4 × 18 mm module widths). The toggle handle protrudes about 10 mm past the front face — account for that in enclosure depth planning. Standard busbar comb can feed the line side across all four poles in one clamp.