The Siemens SIRIUS 3RV1011-0KA10-ZW97 is a motor protection circuit breaker designed for protecting three-phase induction motors. It snaps onto a 35 mm DIN rail (DIN EN 60715) with a screw and snap-on fastening, fitting a 45 mm wide slot in the panel. Rated for Trip Class 10 — it trips within 10 seconds at 7.2× rated current, matching the thermal curve of standard squirrel-cage motors during a locked-rotor start. That keeps the motor winding below damaging temperature while the breaker clears the fault. Breaking capacity hits 100 kA at 240 V, 400 V, and 500 V — enough to interrupt high-fault-current mains without cascading upstream. At 690 V it still clears 2 kA, which covers most industrial networks.
Mounting and wiring
Mounting position is any. The 45 mm width and 75 mm depth leave room for adjacent breakers or contactors on the same DIN rail. Clearances: 20 mm above and below, 9 mm to the side, zero forward or backward — no extra air gap needed beyond the standard DIN-rail spacing. Main circuit terminals are M3 screw-type, accepting 2× (0.5–1.5 mm²) or 2× (0.75–2.5 mm²) solid or stranded.
Backup fuse requirements
When the prospective short-circuit current exceeds the breaker's rated breaking capacity, a backup fuse is required. At 400 V use a gL/gG 20 A fuse; at 500 V and 690 V use gL/gG 16 A. At 240 V no backup fuse is needed.