Siemens 5SY6106-6CC — SENTRON 1-Pole MCB, B Characteristic, 6 kA
The Siemens 5SY6106-6CC is a SENTRON-series miniature circuit breaker (MCB) in active current production. It's a 1-pole unit with B tripping characteristic, rated 6 kA breaking capacity per EN 60898 at 230/400 VAC (50/60 Hz) and 72 VDC maximum. The B curve means it trips at 3–5× rated current — standard for resistive and general-purpose loads where you want fast protection without nuisance trips from inrush.
What the ratings mean for your panel
The 6 kA breaking capacity (per EN 60898) is the maximum prospective fault current this MCB can safely interrupt at rated voltage. For UL 1077 / CSA C22.2 No. 235 installations, the same unit carries a 5 kA interrupting rating — check which standard governs your panel's SCCR study. Pollution degree 3 (conductive pollution or dry non-conductive that becomes conductive) and overvoltage category III suit it for fixed-installation distribution boards, not just final circuits. Temperature derating matters here: the MCB is rated for ambient -40 °C to 75 °C, but the surrounding humidity must stay below 95% at 55 °C, 55% at 70 °C, and 35% at 75 °C. If your panel runs hot near the upper limit, the thermal-magnetic trip curve shifts — account for it in coordination studies.
Mounting and integration
Snaps onto DIN rail via the quick-assembly system, occupying 1 modular width unit (18 mm). Mounting position is unrestricted — vertical, horizontal, upside-down — which helps when panel layout is tight. Combined terminals top and bottom accept supply from either end. Installation depth behind the panel is 70 mm; overall depth is 76 mm. IP20 with connected conductors means it's protected against solid objects over 12 mm but not against water — keep it inside a closed enclosure.