What it is and where it lands
The Siemens 3RV2011-1DA25-ZW96 is a SIRIUS motor protection circuit breaker designed for motor protection, with phase failure detection built in and no ground fault detection. It snaps onto 35 mm DIN rail per DIN EN 60715 via screw and snap-on mounting, and accepts spring-loaded terminals for the main current circuit — no screw torque to verify, just strip and push. Trip Class 10 means it will trip within 10 seconds at 7.2× the thermal setting — standard for general-purpose motor starting where the inrush doesn't linger. That 100 kA breaking capacity at 400 V (and at 240 V, 500 V) tells you it can sit upstream of a fault without needing a backup fuse for most industrial distribution; at 690 V it still holds 10 kA, enough for 690 V line-side applications. Dimensions are 45 mm wide, 106 mm tall, 97 mm deep. Clearance: 50 mm upward and downward, 30 mm at the side, zero forward and backward.
What the ratings mean for fit
The 100 kA breaking capacity at 400 V is the headline number — it means this breaker can safely interrupt a fault current up to 100 kA at that voltage without welding contacts or venting plasma. That's SCCR-level capability for most industrial panels. At 690 V the rating drops to 10 kA, still adequate for 690 V motor branch circuits with typical transformer impedances. Operating temperature range is -20 to +60 °C, storage and transport -50 to +80 °C. The 15 operations per hour maximum at AC-3 duty (and AC-3e) sets the switching pace — fine for a motor start/stop cycle, not for rapid reversing or jogging duty. Spring-loaded terminals accept 2x (0.5 to 2.5 mm²) solid or stranded — typical for control wiring up to 14 AWG. No ferrule needed, but stranded wire benefits from one for consistent insertion.
Panel integration notes
Mounts in any position — vertical, horizontal, upside-down — the breaker's thermal-magnetic trip curve doesn't care about orientation. The 45 mm width means it fits a standard 45 mm DIN-rail slot; plan for 50 mm clearance above and below for terminal access and arc-chamber venting. Side clearance of 30 mm to adjacent devices is the minimum for heat dissipation. Spring terminals on the main circuit mean no screwdriver calibration — strip to 8-10 mm, push in. The auxiliary contact block (if added) shares the same spring-clamp interface. Verify the wire ferrule size against the 2.5 mm² maximum before terminating.