Siemens 5SL7104-3RC Miniature Circuit Breaker, 4A 1-pole K 1

The Siemens 5SL7104-3RC is a 1-pole miniature circuit breaker rated 4A with a K characteristic and a 15kA breaking capacity. The K trip curve is designed for motor and inductive loads where a higher inrush tolerance is needed — it holds through the start-up surge of small motors, transformers, or solenoid valves without nuisance tripping, while still clearing a fault fast. The 15kA interrupting rating means it can safely break a short-circuit fault up to that level without welding contacts or cascading failure upstream, which is the figure that governs coordination in a distribution panel.