The Siemens SENTRON 5SQ2170-2YA05 is a 1-pole miniature circuit-breaker rated 0.5 A with a C tripping characteristic, designed for branch-circuit protection in 240 V AC/DC systems. The 55 mm installation depth and single width unit mean it drops into standard DIN-rail enclosures without crowding adjacent breakers.
C-curve and breaking capacity
The C-curve trips at 5–10× rated current, so the 0.5 A unit clears moderate inrush from small transformers or capacitive loads without nuisance trips. The 0.5 A rating is low enough to protect signal-conditioning circuits or control transformers — not a typical motor branch.
Panel integration
IP20 rated — for enclosed panel use only, not washdown or outdoor. The 55 mm depth fits standard 60 mm deep DIN-rail enclosures; single width unit (approx. 18 mm) leaves room for adjacent breakers or accessories. Overvoltage category 3 and energy limiting class 3 align with typical residential final-circuit coordination.