What it is and what it does
The Siemens 3RV6411-1DA10 is a SIRIUS circuit breaker specifically designed for transformer protection — meaning its thermal-magnetic trip curve is shaped to handle the inrush and overload profile of a transformer, not a motor. Rated at 3.2 A operational current (AC-3 at 400 V) and Trip Class 10, it clears short circuits fast while allowing the transformer's magnetizing inrush to pass. Three poles, 690 V rated voltage, 50-60 Hz, and the whole thing snaps onto a 35 mm DIN rail (DIN EN 60715) — standard panel integration.
Sizing and fit — what the ratings mean
The 3.2 A rating is the continuous current at 400 V AC-3 — that's the load it carries without tripping. Trip Class 10 means it will trip within 10 seconds at 7.2× rated current, which is standard for transformer primary protection where a slower trip (Class 20 or 30) would risk winding damage on a sustained overload. The 690 V rated voltage covers most 400 V and 480 V systems with headroom. Size S00 is the compact frame — 45 mm wide, 96 mm deep, 97 mm tall — and the mounting position is any orientation, so it fits tight enclosures. Screw-type terminals accept 2x (0.75 to 2.5 mm²) solid/stranded or 2x 4 mm², torque 0.8 to 1.2 N·m.
Where it goes
This breaker is sized for transformer primary protection in control panels. The thermal-magnetic design gives both overload and short-circuit protection in one device.