The Siemens SENTRON 5SQ2170-2YA02 is a 1-pole miniature circuit breaker rated 2 A with C-curve tripping characteristic, designed for 240 V AC systems and carrying a 3 kA breaking capacity per EN 60898. It occupies a single modular width (18 mm) on DIN rail and installs at 55 mm depth — shallower than the standard 70 mm SENTRON units, which matters when panel depth is tight.
Snap-on DIN rail mounting, 1 MW slot. IP20 finger-safe with conductors connected; no neutral switching on this pole.
C-curve means magnetic trip between 5× and 10× rated current (10–20 A for this 2 A unit), suited for moderate inrush loads like small contactors or control transformers. Derate at elevated panel temperatures: 1.85 A at 40 °C, 1.6 A at 60 °C.