What it is and what it does
The Siemens SIRIUS 3RV2011-0JA25-ZW97 is a motor protection circuit breaker designed for the main current circuit, with spring-loaded terminals for tool-free wiring. It provides CLASS 10 thermal overload protection, meaning it trips within 10 seconds at 7.2× the thermal setting — fast enough to protect standard induction motors during a locked-rotor event without nuisance tripping on normal starts. The unit also includes phase failure detection, which drops the load if one phase is lost, preventing single-phasing damage on three-phase motors. Rated for 0.2 kW at 230 V and 0.5 hp at 575/600 V, this breaker suits smaller motor loads — pumps, fans, conveyors — in control panels where space is tight. The 45 mm width and 97 mm depth fit standard DIN-rail enclosures, and the screw and snap-on mounting onto 35 mm rail per DIN EN 60715 means it clips in without tools.
Short-circuit ratings and coordination
The 3RV2011-0JA25-ZW97 carries a 100 kA rated short-circuit breaking capacity at 400 V, 480 V, 500 V, and 690 V. That SCCR means it can safely interrupt a fault up to 100,000 A without welding contacts or cascading failure upstream — critical for panels fed from high-capacity transformers. At 240 V the rating is also 100 kA. This level of interrupting capacity typically allows Type 2 coordination with upstream contactors, minimizing damage on a fault.
Auxiliary contact ratings
The built-in auxiliary contacts are rated 1 A at 24 V, 0.5 A at 120 V, 0.5 A at 125 V, and 0.5 A at 230 V. At 60 V the rating drops to 0.15 A. These feed status signals back to a PLC or indicator lamp — enough for 24 VDC control circuits common in modern panels, but the 60 V figure is a derating point worth noting if you're running a 48 VDC control bus.
Mounting and environment
Mounts in any position on 35 mm DIN rail per DIN EN 60715, with screw and snap-on fastening. Operating temperature range is -20 to +60 °C, with temperature compensation active across that span. Storage and transport range is -50 to +80 °C. Clearance requirements: 50 mm upwards, 50 mm downwards, 30 mm at the sides for heat dissipation and arc clearance.