What it is — and what it does in the panel
The Siemens 3RV2011-1HA10-ZX95 is a SIRIUS motor protection circuit breaker designed for motor protection duty. It snaps onto a 35 mm DIN rail per DIN EN 60715 and uses screw-type terminals for the main current circuit. Trip Class 10 means it will trip within 10 seconds at 7.2× the thermal setting — standard for protecting standard induction motors during locked-rotor conditions without nuisance tripping on normal starts.
Key ratings — what they mean for fit
Rated short-circuit breaking capacity hits 100 kA at 400 V and 480 V — that's the fault current it can safely interrupt without welding contacts or venting arc gas into the enclosure. At 500 V it's still 42 kA; at 690 V it drops to 4 kA. For backup fuse coordination, the maximum gL/gG fuse is 50 A at 400 V, 40 A at 500 V, and 35 A at 690 V. Phase failure detection is built in — it will trip on a lost phase, which matters for three-phase motor loads that would otherwise single-phase and burn. No ground fault detection on this variant, so if you need that, you're looking at a different order code.
DIN rail footprint and clearances
Width is 45 mm — that's three 9 mm module spaces on a standard DIN rail, or one 45 mm slot. Depth is 97 mm, height 97 mm. Mounting position any. Required clearances: 50 mm upwards and downwards, 30 mm to the side, 0 mm forwards and backwards. That 0 mm backwards means it can sit flush against the backplane or a busbar support. The 50 mm top/bottom gap is for arc-gas venting and terminal access — don't crowd it.