The Siemens SIRIUS 3RV6411-0FA10 is a 3-pole circuit breaker sized for transformer protection, rated at 0.5 A operational current with a Class 10 trip characteristic. It's built on the S00 frame, which keeps the width at 45 mm, so it fits neatly into a standard DIN-rail panel alongside other SIRIUS motor starters and breakers.
The S00 frame gives you 45 mm width, 97 mm height, 96 mm depth — that's a compact footprint for a 3-pole breaker. Wiring clearance: 50 mm above and below, 30 mm at the sides, 0 mm front and back. Main circuit terminals accept 2×(0.75–2.5 mm²) solid/stranded or 2×4 mm², with a tightening torque of 0.8–1.2 N·m. That's a standard screwdriver range, nothing exotic.
Environment and approvals
Relative humidity 10–95 %. Shock resistance 25g / 11 ms per IEC 60068-2-27. Installation altitude up to 2000 m. The part is RoHS compliant as of the substance prohibitance date 05/01/2012 — so it meets the current EU RoHS directive.