Motor protection circuit breaker for the mill floor
The Siemens SIRIUS 3RV2011-1AA40 is a motor protection circuit breaker designed for the corrosive atmosphere and vibration of a pulp and paper mill. It combines a Class 10 thermal-magnetic trip curve with phase failure detection, so it catches a broken belt or a frozen pump before the windings cook. The 100 kA breaking capacity at 400 V AC means it can interrupt a bolted fault on a motor branch without upstream fuses needing to clear first — that keeps the rest of the machine running when a single motor lets go.
Mounting and panel fit
Snaps onto 35 mm DIN rail per DIN EN 60715, or screws directly to a backplate. At 45 mm wide and 97 mm deep, it fits a standard 8-module enclosure with room for a contactor alongside. The ring-cable-lug main terminals accept M3 ring lugs — no special crimp tool needed. Mounting position is any orientation, which helps when you're retrofitting into an existing panel where the gland plate is already drilled.
Breaking capacity and trip characteristics
Rated breaking capacity is 100 kA at 240 V, 400 V, 500 V, and 690 V AC — that's full-rated all the way up, no derating needed for higher system voltages. The Class 10 trip curve means it clears a locked-rotor condition within 10 seconds at 7.2× rated current, which is fast enough for most IEC motor starts. Phase failure detection is built in, so a single-phased motor trips before the overload curve runs out. Ground fault detection is not included — that would be a separate module upstream.
Environmental tolerance and lifecycle
Rated for operation from -20 °C to +60 °C, with temperature compensation active across that entire span. Storage and transport range is -50 °C to +80 °C, which covers a frozen warehouse or a truck crossing the desert. The lifecycle stage is current — this is an active catalog item, not a phase-out. That matters for a mill that needs to freeze a BOM for a five-year capital project and doesn't want to requalify a substitute mid-stream.