What this breaker is and what it carries
The Siemens SIRIUS 3RV2031-4EB15-ZX95 is a motor protection circuit breaker with 32 A rated current and CLASS 20 trip curve. Breaking capacity hits 30 kA at 400 V, 100 kA at 240 V, and still holds 2 kA at 690 V — enough to clear a fault upstream of most downstream contactors without cascading. Mounts via screw and snap-on onto 35 mm DIN rail per DIN EN 60715, in any position, making it a drop-in for standard European motor control centers.
What the ratings mean for fit
The 32 A rating at 480 V and 32 A at 600 V means this breaker directly protects a motor drawing up to 32 A full-load — typical for a 15 kW (20 hp) 400 V motor or a 10 hp 480 V motor, depending on service factor. CLASS 20 trip allows up to 20 seconds at 600% of rated current before opening — enough for high-inertia loads like fans or compressors, but not for extremely long-start loads that would need CLASS 30. Terminals accept 2x (0.5... 1.5 mm²) or 2x (0.75... 2.5 mm²) solid or stranded, with M6 main contact bolts — standard for panel wiring up to 32 A.
Operating environment and clearances
Runs from -20 to +60 °C during operation, stores and ships from -50 to +80 °C — fine for unheated warehouses and most plant-floor conditions. Minimum clearance: 50 mm upwards, 50 mm downwards, 10 mm at the side, 0 mm forwards — the forward zero means it can sit flush against a panel door or adjacent device. Dimensions: 55 mm wide, 140 mm tall, 149 mm deep — fits standard 55 mm-wide DIN-rail slots.