The Siemens SENTRON 5SY7105-8CC is a 1-pole miniature circuit breaker with a D tripping characteristic, rated at 0.5 A for 230/400 V AC circuits. It's built for high-inrush loads — motor starters, transformers, or switching power supplies — where the D-curve's magnetic trip at 10–20x rated current avoids nuisance tripping on startup.
Fit and footprint
Mounting position any, so it works in vertical or horizontal busbar layouts. IP20 with connected conductors, meaning it's enclosed in a panel, not exposed on the line side.
Approvals and environment
The 5 kA breaking capacity per UL 1077 / CSA C22.2 No.235 covers North American supplementary protection applications. Halogen-free and silicon-free construction, so it won't outgas corrosive compounds in sealed panels near sensitive electronics.