What this breaker is and what it does
The Siemens 3RV2332-4JC10 is a SIRIUS-brand circuit breaker designed specifically for starter combinations — meaning it sits ahead of a contactor to provide short-circuit and overload protection for a motor branch circuit. It's not a general-purpose distribution breaker; the design-of-product field confirms it's for starter combinations, so the trip curve and breaking capacity are tuned for motor-starting inrush rather than lighting or resistive loads. Rated breaking capacity at 400 V is 50 kA — that's the fault current it can safely interrupt without welding contacts or rupturing the case. At 500 V it drops to 8 kA, and at 690 V to 4 kA, so if your panel's available fault current sits above those numbers at the higher voltages, you'll need a current-limiting upstream device or a different frame. At 240 V it's rated 100 kA, which covers most North American industrial services. Motor power assignment: 18.5 kW at 230 V, 25 hp at 220/230 V, 50 hp at 460/480 V, 60 hp at 575/600 V. That lines up with a NEMA size 3 or 4 contactor range — useful for medium-horsepower pumps, compressors, and conveyors on a 480 V plant bus.
Panel fit and clearances
Mounts via screw and snap-on onto 35 mm DIN rail per DIN EN 60715. Width is 55 mm — that's three standard 18 mm module widths, so it occupies three slots on the rail. Depth is 149 mm, height 140 mm. Plan for 50 mm clearance above and below, 10 mm to the sides, and zero forward or backward clearance required. That zero forward clearance means it can sit flush against a gland plate or back panel without derating. Terminals accept 2x 1–35 mm² or 1x 1–50 mm² solid or stranded copper. Main contact terminals are M6 screw-type.