The Siemens 3RV1021-0DA15-ZX95 is a SIRIUS motor protection circuit breaker rated for 0.32 A continuous current with a Class 10 trip characteristic, meaning it clears overloads fast enough to protect standard induction motors from locked-rotor heat buildup. It breaks up to 100 kA at 400 V AC — that's the full prospective fault current the supply can deliver, so it handles high-capacity distribution without needing an upstream fuse.
Mounts on 35 mm DIN rail per EN 50022, screw or snap-on. The 45 mm wide body fits a standard 4-module slot on the rail. Screw terminals on the main circuit accept 2x (0.5…1.5 mm²) solid or 2x (1…2.5 mm²) stranded; auxiliary and control circuits use the same screw-type terminals. IP20 on the front — fine for a closed panel, not for washdown.