The Siemens 5SY4363-8 is a 3-pole D-curve miniature circuit breaker in the SENTRON line, built for industrial panels and equipment. It carries a dual interrupting rating — 10 kA under EN 60898-1 and 15 kA under IEC 60947-2 — giving you headroom for high-fault installations. The D-curve handles the inrush of motor starters and lighting transformers without nuisance tripping. Rated for AC 400/440 V and DC 72 V, it covers both main feeder and control circuit isolation.
Terminal top and bottom accept combined conductors, and the neutral is fixed (no moving neutral contact).
Certified to IEC/EN 60898-1, IEC/EN 60947-2, and UL 1077; the UL break rating is 5 kA, while IEC 60947-2 gives 15 kA.