What it is and what it does
The Siemens 3RV1011-0JA10-ZW97 is a SIRIUS motor protection circuit breaker designed to protect motors against overload and short-circuit. It's a Class 10 device, meaning it trips within 10 seconds at 7.2× the set current — fast enough to protect standard induction motors during locked-rotor conditions without nuisance tripping on normal starts. It also detects phase failure, which is common in field conditions where a blown fuse upstream can single-phase a motor and cook it.
Breaking capacity — what the 100 kA rating means
This breaker carries a 100 kA breaking capacity at 240 V, 400 V, 500 V, and 690 V AC. That means it can safely interrupt a fault current up to 100,000 amps at those voltages without welding its contacts or venting plasma. In practical terms, this lets you place it downstream of a high-capacity transformer without needing a current-limiting upstream breaker — saves a DIN rail slot and a line item on the BOM.
Mounting and panel fit
Mounts via screw or snap-on onto 35 mm DIN rail per DIN EN 60715. Dimensions are 75 mm deep, 45 mm wide, 90 mm tall — that's a standard 45 mm module width, so it occupies one slot in a typical Siemens or compatible panel layout. Clearance requirements: 20 mm upward, 20 mm downward, 9 mm to the side, zero forward or backward. That 9 mm side gap is tighter than some breakers; if you're packing multiple units side-by-side, make sure the enclosure's internal width accounts for it.
Terminals and wiring
Main circuit terminals are screw-type, sized for M3 screws. Accepts two conductors per terminal: 2× (0.5 to 1.5 mm²) solid or stranded, or 2× (0.75 to 2.5 mm²). That's enough for a motor feed cable up to about 2.5 mm² — typical for fractional to small integral horsepower motors. If your motor draw calls for larger wire, step up to the next frame size in the SIRIUS family.