The Siemens SENTRON 5SY7115-8 is a 1-pole miniature circuit breaker rated 1.6 A with a D tripping characteristic, designed to protect circuits with high inrush currents like motor starters or transformer primaries. It mounts on a standard DIN rail at 18 mm (one width unit) and fits any panel position. The D curve means the magnetic trip operates at 10–20× rated current, so it holds through the startup surge of inductive loads without nuisance tripping.
Breaking capacity and selectivity
Rated breaking capacity hits 15 kA per EN 60898 and 50 kA per IEC 60947-2 at 400 V AC — that 50 kA figure is the industrial-grade rating you need for high-fault panels where the upstream transformer can dump serious current. The 5 kA per UL 1077 / CSA C22.2 No. 235 covers North American supplemental protection applications. For DC circuits, it interrupts up to 15 kA at 72 V (IEC 60947-2) or 5 kA at 125 V (UL 1077). The 50 kA SCCR gives you headroom for coordination studies without cascading upstream.
Environmental and installation
Ambient temperature range spans -40 to +70 °C, so it's fine for unheated enclosures or near hot machinery. Storage range extends to -40 to +75 °C. The housing is halogen-free and silicon-free, important for clean-room or sensitive electronics environments where off-gassing matters. Terminals accept solid or stranded conductors from 0.75 to 35 mm², with combined top and bottom terminals for easy daisy-chaining. Touch protection is built in, and the unit is sealable to prevent tampering. IP20 rating with connected conductors — standard for a panel-mounted breaker.