The Siemens SENTRON 5SL5101-7RC is a 1-pole miniature circuit breaker (MCB) rated for 220 V DC with a C tripping characteristic and 10 kA breaking capacity.
The 220 V DC rating covers most nominal 220 VDC bus voltages common in European telecom and solar installations. The 10 kA breaking capacity at 220 V DC means it can safely interrupt a fault current up to 10 kA without welding contacts or cascading upstream — adequate for most secondary distribution panels with a transformer-limited fault level.
Snap-on mounting to 35 mm DIN rail; depth of 76 mm and installation depth of 70 mm leave clearance for wiring behind the rail. The 18 mm width (1 modular unit) means it fits any standard enclosure busbar comb. IP20 with connected conductors — suitable for dry indoor panels only, not washdown areas. Terminal touch protection is built in (finger-safe per the spec).
Halogen-free and silicon-free construction — important for clean-room or high-reliability installations where outgassing must be minimized.