What it is and what it does
The Siemens SIRIUS 3RV2011-1BA10-ZW96 is a motor protection circuit breaker designed to protect three-phase induction motors against overload, short-circuit, and phase failure. It is part of the SIRIUS family, the standard for motor feeders in European control panels. Its CLASS 10 trip characteristic means it will trip within 10 seconds at 7.2× the thermal setting current — fast enough to protect a motor winding during a locked-rotor event without nuisance tripping on normal starting inrush. The breaker is rated for a short-circuit breaking capacity of 100 kA at 400 V AC, which is high enough to be used in most industrial distribution panels without needing an upstream current-limiting fuse for SCCR compliance.
Mounting and integration
Mounts via screw and snap-on onto a 35 mm standard mounting rail per DIN EN 60715. The 45 mm width means it occupies a single 45 mm module on the DIN rail — standard for this class of motor protection breaker. Clearance requirements: 50 mm upwards and downwards, 30 mm at the sides, 0 mm forwards and backwards — so it can be packed tightly against other devices on the same rail as long as vertical airflow is maintained. Terminals are M3 screw-type for the main current circuit, accepting 2×(0.75–2.5 mm²) solid or stranded, or 2×4 mm². Strip length and torque are standard for this terminal size.