Siemens 5SY7420-7 — 4-pole C-curve MCB for panel builds
It carries a 15 kA breaking capacity per EN 60898-1 and 25 kA per IEC 60947-2, so it handles high-fault-current panel feeds without cascading upstream — the 25 kA figure is the one that governs industrial distribution board coordination. At DC the part is rated 15 kA at 60 V (max 72 V), which covers control-circuit protection in battery-backed or rectifier-fed sections. The C-curve (5–10× In) suits motor-starting and transformer inrush loads common in mechanical engineering and industrial environments.
The breaker is certified to IEC / EN 60898-1, IEC / EN 60947-2, and UL 1077 / CSA C22.2 No. 235 (5 kA under UL/CSA). The manufacturer provides RoHS and REACH declarations as part of the standard documentation package; a UL/CSA mark is present on the nameplate.