The Type A tripping characteristic means it trips on short-circuit and overload with a defined time-current curve that sits between Type B and Type C — it handles moderate inrush without nuisance trips while still clearing faults fast enough for semiconductor protection in some applications. The neutral conductor is switched internally (1P+N), so the breaker isolates both poles when opened.
This breaker carries three breaking capacity ratings depending on the standard applied: 10 kA per EN 60898-1 at 230 V AC, 35 kA per IEC 60947-2 at 230 V AC, and 5 kA per UL 1077 / CSA C22.2 No.235. For DC circuits, the rated breaking capacity is 15 kA at 60 V DC (max 72 V DC). The pollution degree 3 rating and overvoltage category III mean the 5SY4503-5 is designed for the fixed installation inside an industrial enclosure where transient overvoltages from the supply network are expected — not for outdoor or wet locations (IP20 only with conductors connected).
The breaker is certified to IEC / EN 60898-1, IEC / EN 60947-2, and UL 1077 / CSA C22.2 No.235. Vibration resistance per IEC 60068-2-6 covers ±1 mm at 5–25 Hz and 50 m/s² at 25–150 Hz, adequate for most industrial machinery.