The Siemens 5SY7504-8 is a SENTRON miniature circuit breaker from the 5SY7 series, designed for branch-circuit protection in industrial control panels. It carries a D tripping characteristic — meaning it tolerates the high inrush currents typical of motor and transformer loads before tripping — and is rated 4 A at 230 V AC. The 2-pole (1P+N) configuration switches both phase and neutral, with the neutral pole switching confirmed by the product function.
Breaking capacity and selectivity
The 5SY7504-8 is rated 15 kA per EN 60898 and 40 kA per IEC 60947-2 — the higher figure under the industrial standard gives headroom for high-fault installations. For UL 1077 / CSA C22.2 No. 235 the rating is 5 kA, which governs North American panel acceptance. The 40 kA SCCR under IEC 60947-2 means this breaker can safely interrupt faults up to that level without cascading upstream, a key figure for selectivity studies in a distribution board.
Mounting and panel integration
Snap-on mounting to DIN rail via the quick assembly system; any mounting position is permitted. The 36 mm width occupies 2 width units on the rail. Installation depth is 70 mm; overall depth with terminals is 76 mm. The combined top and bottom terminals accept wiring from either direction, and the neutral conductor is switched internally — no separate neutral bar needed for the switched pole. IP20 with connected conductors, pollution degree 3, overvoltage category III.
Environmental and material specs
Rated for ambient temperatures from -40 °C to 75 °C, with humidity influence capped at 95% up to 55 °C, derating to 35% at 75 °C. Halogen-free and silicon-free construction. Sealable for tamper-evident installations. Touch protection is built in.