The Siemens SIRIUS 3RV2011-1AA15-ZX95 is a motor protection circuit breaker designed to protect motors against overload, short circuit, and phase failure — a single device that replaces a thermal overload relay plus fuse combination in the motor feeder. Its Class 10 trip characteristic means it will disconnect before the motor windings overheat under locked-rotor conditions, which is critical for motors driving high-inertia loads like conveyors, crushers, and fans where acceleration time can approach the thermal limit.
Breaking capacity and coordination
Rated breaking capacity hits 100 kA at 400 V, 500 V, and 690 V — that is full-rated short-circuit interruption without needing an upstream fuse for most industrial supply transformers. For a hot-strip mill auxiliary drive panel fed by a 2 MVA transformer with 50 kA prospective fault current, this breaker clears the fault without cascading to the main breaker, keeping the rest of the line online.
Mounting and integration
Mounts via screw and snap-on onto 35 mm standard mounting rail per DIN EN 60715. The 45 mm width fits a standard 8-module spacing; the 97 mm depth leaves clearance for wiring ducts in a 200 mm deep enclosure. Any mounting position is allowed, so it can be oriented horizontally in a shallow gland-plate layout.