The Siemens SENTRON 5SP5191-7CC is a 1-pole miniature circuit breaker (MCB) from the 5SP series, designed specifically for DC circuits. It carries a C-curve tripping characteristic and is rated at 100 A with a breaking capacity of 10 kA at 250 VDC per IEC 60947-2. That 10 kA rating means it can safely interrupt a DC fault current up to that level without welding contacts or cascading failure upstream — critical for protecting downstream loads in a DC distribution panel.
DC-rated protection — what the ratings mean for fit
This is a DC-only breaker (the supply frequency is listed as 0 Hz). The 250 VDC rated voltage and 10 kA breaking capacity define its application envelope: it protects a single DC bus or load branch, not an AC circuit. The C-curve means the magnetic trip operates at 5–10 times rated current — suitable for loads with moderate inrush like DC motor drives, contactor coils, or capacitive power supplies. At 100 A, this is a high-current single-pole DC breaker; most SENTRON 5SL series MCBs top out at 20 A or 16 A on AC. The 1.5 modular width units (27 mm wide) mean it occupies one-and-a-half standard 18 mm DIN-rail positions, so check your panel layout — it will not fit a single-width slot.
Integration and mounting
Mounts on standard 35 mm DIN rail (EN 60715) with screw fixing also supported. The 70 mm depth and 90 mm height match the SENTRON 5SL and 5SP family footprint, so it aligns with adjacent breakers in a multi-pole arrangement. IP20 with connected conductors — suitable for enclosed panel installation, not for wet or washdown environments. Pollution degree 3 and overvoltage category III mean it is rated for industrial environments where conductive dust or condensation may be present. Tunnel terminals top and bottom accept copper conductors; halogen-free and silicon-free construction avoids outgassing concerns in sealed enclosures.
Supplementary devices and mechanical endurance
The breaker accepts supplementary devices (auxiliary switches, shunt trips, alarm contacts) — the product extension feature is enabled, so you can add remote status or trip indication without replacing the base unit. Mechanical service life is 10,000 operating cycles typical, which is standard for a molded-case MCB in a distribution panel. Shock resistance tested to 150 m/s² at 11 ms half-sine, vibration resistance to 50 m/s² at 25–150 Hz and 60 m/s² at 35 Hz (4 s) — robust enough for industrial machinery and transport applications.