Miniature circuit breaker for panel protection
The Siemens SENTRON 5SY4215-7CC is a 2-pole miniature circuit breaker (MCB) with a C-curve tripping characteristic, rated 1.6 A at 35 °C (AC) and a breaking capacity of 10 kA per EN 60898. It snaps onto DIN rail, takes two modular width units (36 mm wide), and fits any mounting position. The 10 kA SCCR at 400 V means it safely interrupts faults up to that level without cascading upstream — a solid choice for final subcircuit protection in industrial control panels.
What the ratings mean for your BOM
The C-curve means magnetic trip between 5 and 10 times In — it's the standard for moderate inrush loads like small motors, contactor coils, and lighting banks. The 1.6 A rating at 35 °C derates to 1.5 A at 40 °C, 1.45 A at 45 °C, 1.4 A at 50 °C, and 1.35 A at 55 °C. If your panel ambient runs warm, size up one frame. The 10 kA breaking capacity per EN 60898 is the interrupting rating at the rated voltage — adequate for most distribution boards fed by a transformer or upstream MCCB.
Panel integration notes
Width 36 mm (2 modular units), depth 76 mm, height 90 mm. Snaps onto DIN rail via the quick-assembly system — no tools needed. Installation depth 70 mm behind the panel face. IP20 with connected conductors — fine for enclosed distribution boards, not for wet areas. Operating temperature range -40 to 75 °C with humidity limits per: max 95% RH up to 55 °C, derating to 55% at 70 °C and 35% at 75 °C. Pollution degree 3, overvoltage category III — suitable for fixed installations downstream of the main distribution.