What it is and what it does
The Siemens 3RV2031-4TA15 is a SIRIUS motor protection circuit breaker — a compact, DIN-rail-mounted device that combines a circuit breaker and motor overload relay in one unit. It's designed to protect motor feeders against short-circuit, overload, and phase failure, with a CLASS 10 trip characteristic that clears overloads fast enough to keep most standard induction motors from overheating on a locked-rotor start. Rated voltage spans 20 to 690 V AC, and the breaking capacity hits 30 kA at 400 V — enough to handle high-fault-current industrial panels without needing an upstream current-limiting fuse in many installations. It also carries 100 kA at 240 V, 6 kA at 500 V, and 3 kA at 690 V, so you can apply it across a range of supply voltages and still meet the SCCR requirement.
Mounting and integration
Mounts via screw or snap-on onto standard 35 mm DIN rail per DIN EN 60715, in any orientation. Dimensions are 55 mm wide, 140 mm tall, 149 mm deep — fits a standard 55 mm slot in a motor control center or panel. Clearance requirements: 50 mm above and below for airflow and arc-chamber venting, 10 mm at the sides. Main contact terminals accept M6 bolts, and the control wiring can take 2 x (0.5 to 1.5 mm²) or 2 x (0.75 to 2.5 mm²) solid or stranded — spring-cage or screw terminals depending on the variant, but this listing's terminal spec covers the copper range you'll typically pull for a motor feeder.
Sourcing and lifecycle
The 3RV2031-4TA15 is listed as current production. It is sourced through independent distribution channels and quoted to order against an RFQ.