What it is and where it fits
The Siemens 3RV2011-1HA10-ZW97 is a SIRIUS motor protection circuit breaker — a compact, DIN-rail-mounted device sized for motor branch circuits in control panels and MCCs. It combines a thermal-magnetic overload relay and a magnetic short-circuit trip in one 45 mm wide package, rated for 5 hp at 460/480 V. Trip Class 10 means it opens within 10 seconds at 7.2× the setting current — fast enough to protect a standard induction motor winding from locked-rotor heat buildup without nuisance tripping on a normal start. Phase failure detection is built in, so a lost phase on the line side will drop the motor off before single-phasing cooks the windings.
Breaking capacity — the real-world number
This breaker carries a 100 kA rated short-circuit breaking capacity at 400 V AC — that is the same order of magnitude as a high-end molded-case breaker, but in a 45 mm motor-protection footprint. It means you can install it downstream of a transformer or a high-fault-capacity bus without needing a current-limiting upstream fuse for coordination, as long as the prospective fault current stays under 100 kA. At 690 V the breaking capacity drops to 4 kA — still adequate for most 690 V motor circuits with a properly sized upstream fuse or breaker.
Mounting and clearances
Fastens via screw and snap-on onto 35 mm DIN rail per DIN EN 60715. Mounting position is any — no derating for horizontal or inverted orientation. Clearance requirements: 50 mm upwards, 50 mm downwards, 30 mm to the side, zero forwards or backwards. That 50 mm vertical gap is for arc venting — do not crowd the vents against a panel wall or cable duct.