The Siemens SENTRON 5SL4208-7RC is a 2-pole miniature circuit breaker rated 8 A with a C tripping characteristic and a 10 kA breaking capacity per EN 60898 at 415 V AC. It snaps onto a standard DIN rail, occupying a single modular width unit (18 mm), and is intended for residential and infrastructure branch-circuit protection where the C-curve handles moderate inrush from motorized loads or transformers without nuisance tripping.
Ratings and what they mean for the panel
The 10 kA breaking capacity at 415 V AC (per EN 60898) means this MCB can safely interrupt a fault current up to 10,000 A without welding its contacts or rupturing the case — sufficient for most residential and light commercial service entrances where the prospective short-circuit current stays under that threshold. The C-curve (tripping between 5× and 10× rated current) is the standard choice for circuits feeding small motors, pumps, or compressors; a B-curve would trip too easily on their starting surge, while a D-curve would allow a fault to persist too long. Rated 8 A at both 30 °C and AC, the thermal-magnetic trip holds steady across the operating temperature range (−40 °C to 75 °C) without derating in typical panel ambient. The 2-pole design switches both line conductors simultaneously — no neutral switching (the neutral bar stays solid). Mechanical life is rated at 10,000 switching cycles, which covers years of normal on-off and fault clearing in a residential or infrastructure panel.
Integration and mounting
Snaps onto DIN rail in any mounting position. Depth 76 mm (70 mm installation depth), width 18 mm. IP20 with connected conductors. Touch protection built into terminals.