Siemens SIRIUS 3RV1083-7JL10 — 800 A MCCB for Motor Protection
The Siemens SIRIUS 3RV1083-7JL10 is a molded-case circuit breaker (MCCB) designed specifically for motor protection, rated at 800 A continuous current and 355 kW at 400 V. It carries a 100 kA short-circuit breaking capacity at both 240 V and 400 V AC, dropping to 65 kA at 500 V and 30 kA at 690 V — enough headroom for most industrial distribution panels feeding motor control centers. The overload release and short-circuit trip are both electronic, with an adjustable trip class of CLASS 10, 20, or 30. That means you can match the thermal curve to the motor's starting profile — CLASS 10 for high-inertia loads like crushers, CLASS 20 for standard pumps and fans, CLASS 30 for long-start conveyors. Phase failure detection is built in; ground fault detection is not, so if you need GF protection, plan for an external module or a different breaker.
Mounting and Integration
Fastens via screw fixing — no DIN-rail clip on this frame size. Dimensions are 210 mm wide by 268 mm high by 103.5 mm deep, with zero clearance required at the back or sides, so it can sit tight against the panel backplane or adjacent devices. Mounting position is any orientation, which simplifies layout in a crowded enclosure. The front is IP20 finger-safe, and the terminals are screw-type for both main and auxiliary circuits. Rated for 15 operations per hour maximum at AC-3 duty — this is a protection device, not a switching contactor. The surge voltage resistance is 8 kV, so it handles transient spikes on industrial mains without nuisance tripping. Shock resistance is 12g for 11 ms, acceptable for most machine-mounted applications.