The Siemens 3RV2811-0JD10 is a SIRIUS circuit breaker in size S00, designed specifically for transformer protection per UL 489 and CSA C22.2 No.5. That UL 489 listing means it's certified as a branch-circuit protective device — not just a supplementary protector — so it can serve as the sole overcurrent protection on a transformer primary, saving a separate fuse or breaker downstream.
Interrupting capacity — the number that governs the fault study
Rated at 100 kA at 240 V, 400 V, 500 V, and 690 V AC. That's a flat 100 kA SCCR across the common industrial voltage range. The 100 kA figure holds for both the general-purpose and AC-3 motor switching duty, so it covers mixed loads on the same branch.
The screwdriver shaft needs a 5 to 6 mm diameter, Pozidriv size 2 tip. Mounting position is any orientation — no derating for sideways or inverted installation. That 97 mm depth means it sits flush with most 100 mm deep enclosures; no need for a deeper gland plate.
Environmental limits and switching frequency
The storage range is wider — that's the handling limit, not the running limit. That's fine for a transformer primary or a pump start, but not for a rapid-cycling application like a press or a conveyor index.