What it is and where it lands
The Siemens 3RV1011-1CA15 is a SIRIUS circuit breaker, the brand's motor-protective breaker line for control panels and distribution boards. It's the component that sits between the contactor and the supply — sized to protect motor branch circuits against short-circuit and overload. Rated for operating voltages from 20 to 690 V, it carries a CLASS 10 trip characteristic. Breaking capacity hits 100 kA at 400 V and 500 V, and 2 kA at 690 V — that's the fault current it can safely interrupt without welding its contacts or venting arc gas into the panel. For the 690 V case, the spec calls for upstream gL/gG fuses sized at 25 A.
Mounting and wiring — panel fit
Mounts via screw or snap-on onto 35 mm DIN rail per DIN EN 60715. The 45 mm width is standard for this frame size — it occupies one 45 mm slot in a panel layout. Terminals accept 2× (0.5 to 1.5 mm²) or 2× (0.75 to 2.5 mm²) solid or stranded copper. Main contact screws are M3. Mounting position is any orientation — no derating needed for side or inverted installation. Clearance requirements: 20 mm above and below, 9 mm to the side, zero forward or backward.
Auxiliary contact ratings — what the numbers mean
The built-in auxiliary contact (Note 1 on the label) is rated for switching at various control voltages: 1 A at 24 V, 2 A at 110–125 V, 0.5 A at 230 V, and 0.15 A at 60 V. These are the make/break capacities for the signal contact — not the main power path. Use them to drive a PLC input, a status lamp, or a contactor coil within those limits.