The Siemens SENTRON 5SY4101-6CC is a 1-pole miniature circuit breaker rated at 1 A with a B tripping characteristic and 10 kA breaking capacity per EN 60898.
The 18 mm width (1 MW) means you can pack up to 16 of these in a standard 300 mm enclosure row. The IP20 rating applies with conductors connected — keep the front cover closed during panel live-work. Touch protection is built into the design.
Thermal derating and environment
Rated current is 1 A at 35 °C ambient. Above that, derate: 0.94 A at 40 °C, 0.91 A at 45 °C, 0.88 A at 50 °C, and 0.84 A at 55 °C. Pollution degree 3 (conductive pollution) is covered — suitable for most control rooms and light industrial floors.