The SENTRON 5SL5208-7RC is a 2-pole miniature circuit breaker rated for DC circuits at 220 VDC, with a C-curve trip characteristic and an 8 A rated current. Its 10 kA breaking capacity at 220 VDC means it can safely interrupt a fault current up to that level without welding contacts or cascading damage upstream — a key figure for DC bus protection in control panels or string-level solar combiner boxes where fault currents can be high.
What the Ratings Mean for Fit
The 2-pole design (2P) switches both the positive and negative legs of a DC circuit, which is standard practice for DC branch protection — single-pole switching on DC can leave the load referenced to the opposite rail. The C-curve (magnetic trip between 5× and 10× In) suits moderate inrush loads like DC-DC converters, solenoid valves, or contactor coils; for purely resistive DC loads a B-curve would trip faster on overload, but the C-curve avoids nuisance trips on capacitive input filters common in switched-mode supplies.
Panel Integration
Mounts on standard DIN rail (EN 60715) in a distribution board or control panel. The 2-pole width occupies two modular units (36 mm). Terminals accept copper conductors up to the cross-section typical for 8 A DC circuits — no special lug kit needed.