What it is and what it does
The Siemens SIRIUS 3RV1011-1JA10-ZX95 is a motor protection circuit breaker designed to protect motors against overload and short-circuit. It is part of the SIRIUS brand, a well-known industrial control component family. The breaker is rated for a voltage range of 20 to 690 V and offers a Class 10 trip characteristic, meaning it will trip within 10 seconds at 7.2 times the rated current — fast enough to protect standard induction motors during a locked-rotor event. The unit is designed for motor protection and includes phase failure detection, which is critical for preventing single-phasing damage on three-phase motors. It does not include ground fault detection.
Key ratings and what they mean for fit
The interrupting capacity is 100 kA at 240 V, 13 kA at 400 V, 3 kA at 500 V, and 2 kA at 690 V. These figures tell you the maximum fault current the breaker can safely clear at each voltage level. For a 400 V panel with an available fault current of 10 kA, this breaker has headroom. The gL/gG fuse backup ratings are 80 A at 240 V, 63 A at 400 V, and 50 A at both 500 V and 690 V — these are the maximum upstream fuse sizes for coordination. The breaker is rated for AC-3 duty at a maximum of 15 switching operations per hour, which is typical for motor starting applications. The horsepower ratings are 3 hp at 220/230 V, 2 hp at 200/208 V, and 1.5 hp at 230 V — useful for matching to standard North American motor sizes.
Mounting and integration
Mounts via screw and snap-on onto a 35 mm DIN rail per DIN EN 60715. The footprint is 45 mm wide, 90 mm high, and 75 mm deep. Clearance requirements: 20 mm upwards, 20 mm downwards, 9 mm to the side, and 0 mm forwards or backwards — meaning it can be butted against a back panel or enclosure wall with no extra space needed. Mounting position is any orientation. Terminals are screw-type for the main current circuit, accepting 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) solid or stranded wire. Main contact screws are M3.