The Siemens 5SY5206-6CC12 is a 2-pole miniature circuit breaker (MCB) from the 5SY5 series, rated for 440V DC with a 10kA breaking capacity and a B-curve trip characteristic at 6A. The 440V DC rating means it's built for DC circuits at that voltage level — common in industrial control panels, solar combiner boxes, or battery banks — where standard AC-rated MCBs may not interrupt a DC fault reliably. The B-curve (3-5x In instantaneous trip) makes it suitable for protecting resistive or lightly inductive loads like lighting, control transformers, or PLC power supplies where inrush isn't high.
Snap-on DIN rail mounting for standard 35mm rail in an enclosure. The 2-pole format occupies two modular spaces (about 36mm). Rated for DC side protection — think string-level combiner boxes, DC bus distribution in drives cabinets, or battery circuit protection in UPS systems. The B-curve avoids nuisance tripping on small capacitive inrush from DC-DC converters or filter caps.