The Siemens 3RV1011-1DA20-ZW97 is a SIRIUS-brand motor protection circuit breaker, rated 3.2 A continuous with a CLASS 10 trip characteristic. That CLASS 10 means it disconnects within 10 seconds at 7.2× rated current — fast enough to protect standard induction motors from locked-rotor heat buildup without nuisance tripping on normal starts. The 100 kA breaking capacity at 400 V AC handles high-fault utility feeds, so this breaker can serve as the sole branch-circuit protection in most panelboards without needing a separate upstream fuse.
Mounting and wiring
Snap-on mounting onto 35 mm DIN rail per EN 50022. The 45 mm width is a standard half-module — three fit in a 135 mm wide section. Spring-loaded terminals on the main current circuit accept 2x (0.25... 2.5 mm²) solid or 2x (0.25... 1.5 mm²) finely stranded with ferrule. No screw torque to check; strip to 8 mm and push in. Any mounting position works, and the IP20 finger-safe front means it's fine inside a closed panel but not in a washdown zone.
Breaking capacity and selectivity
Rated breaking capacity: 100 kA at 240 V AC, 100 kA at 400 V AC, 3 kA at 500 V AC, 2 kA at 690 V AC. The 100 kA at 400 V is the figure that matters for most industrial panels — it's high enough to achieve full selectivity with a 100 kA-rated upstream MCCB or fuse, so a downstream fault won't cascade. The 690 V rating drops to 2 kA, which still covers most motor circuits at that voltage. Phase failure detection is built in; ground fault detection is not, so if you need GF protection, add a separate module.
Power dissipation and derating
Total power dissipation at rated current in hot operating state: 7.25 W, or 2.4 W per pole. That's low enough that you don't need to derate adjacent devices in a typical 45 mm pitch on DIN rail. Ambient operating range -20 to +60 °C; storage and transport -50 to +80 °C. Shock rated 25g / 11 ms. Maximum operating altitude 2 000 m without derating — above that, consult the Siemens application guide for current reduction.