Characteristic A trip curve means it reacts to short-circuit currents faster than B or C curves, making it the right choice for semiconductor protection or long cable runs where low-impedance faults need clearing before the upstream device sees them.
Rated 10 kA per IEC 60898-1 at 230 V AC, and 35 kA per IEC 60947-2 — the higher figure applies when the breaker is installed in an industrial distribution board where the prospective fault current is known to exceed 10 kA. DC side: 15 kA at 60 V per IEC 60947-2. For UL 1077 recognized supplementary protection, the interrupting rating is 5 kA. The dual rating (IEC 60898-1 for household-type installations, IEC 60947-2 for industrial switchgear) means this breaker can be specified into either a commercial DB or an industrial MCC bucket without swapping part numbers. UL 1077 listing covers North American supplementary protection applications.
Environmental and service life
Ambient temperature range from -40 °C to 75 °C, with humidity derating above 55 °C (95% RH up to 55 °C, 55% at 70 °C, 35% at 75 °C). Vibration resistance per IEC 60068-2-6: ±1 mm at 5–25 Hz, 50 m/s² at 25–150 Hz.
The 5SY4501-5 is an active catalog line within the Siemens SENTRON family.