SENTRON 5SY4108-6 — 1-pole B-curve MCB for panel and load-center protection
The Siemens SENTRON 5SY4108-6 is a 1-pole miniature circuit breaker with B-curve tripping characteristic, rated 10 kA breaking capacity per IEC/EN 60898-1 and 20 kA per IEC/EN 60947-2 / UL1077. That dual standard means it covers both residential / light commercial (EN 60898) and industrial panel (IEC 60947-2) applications — the higher 20 kA figure matters when the fault current at the panel bus is above 10 kA. It occupies one modular width (18 mm) on a DIN rail, depth 76 mm, IP20 with conductors connected.
The 10 kA (EN 60898) figure is the default for most building distribution boards; the 20 kA (IEC 60947-2) rating applies when the breaker is installed in an industrial panel with higher prospective fault current.
Panel integration — DIN rail, 1 MW, any mounting position
Fastening method is quick-assembly system — snaps on and off without tools. Any mounting position allowed. Depth behind panel is 70 mm (installation depth), overall depth 76 mm. Sealable for tamper-proof applications.