What this SIRIUS breaker does in the panel
The Siemens 3RV2411-0DA20 is a SIRIUS circuit breaker sized S00, designed specifically for transformer protection rather than general motor or feeder duty.
Trip Class 10 and what it means for transformer protection
For a transformer primary, that's fast enough to protect the winding from a sustained overload, but slow enough to ride through the 8–12× inrush that lasts a few cycles on energization. If you're swapping in a general-purpose motor-protective breaker that lacks this tuning, you'll get nuisance trips on every power-up — the 3RV2411-0DA20 avoids that.
This breaker delivers 100 kA breaking capacity across the 240 V to 690 V AC range. That SCCR headroom lets you place it on a high-fault panel without upstream fuses or a current-limiting reactor — the breaker itself handles the full fault energy.
DIN rail fit and wiring
Width is 45 mm, depth 97 mm, height 106 mm. Mounting position is any orientation. Clearance: 50 mm above and below, 30 mm at the sides, zero forward or backward. That's a tight envelope — fits well in a shallow enclosure where you'd struggle with a rotary-handle breaker.