The Siemens SIRIUS 3RV2711-0JD10 is a circuit breaker in the S00 frame size, designed for system protection per UL 489 and CSA C22.2 No. 5. It's the part that sits upstream of a motor starter or downstream of a feeder breaker, providing short-circuit and overload protection for the branch circuit.
Any mounting position is permitted, which simplifies layout when the panel is tight on vertical clearance. That last one means you can butt it against a panel door or cover without derating.
Rated operational voltage spans 20 to 690 V AC. The 100 kA interrupting capacity holds across the full range — 240 V, 400 V, 500 V, 690 V — which is unusual; many breakers derate at higher voltages. That flat SCCR curve simplifies coordination studies: one number for the whole voltage band. Maximum switching frequency under AC-3 duty (motor starting) is 15 operations per hour — fine for a pump or conveyor start cycle, not for a rapid-reversing application.
