What it is and where it lands
The Siemens SIRIUS 3RV2331-4XC10 is a circuit breaker designed specifically for starter combinations — meaning it integrates motor protection and short-circuit protection in one device, sized for a panel that feeds a motor branch circuit. It mounts via screw and snap-on onto 35 mm DIN rail per DIN EN 60715, so it drops into any standard industrial enclosure without adapter plates. Rated 59 A at both 480 V and 600 V, with a breaking capacity of 30 kA at 400 V and 100 kA at 240 V. That 30 kA at 400 V means it can safely interrupt a fault current up to 30,000 A on a 400 V line — enough headroom for most industrial distribution panels without needing an upstream current-limiting fuse.
Panel fit and clearances
Dimensions: 149 mm deep, 55 mm wide, 140 mm tall. The 55 mm width is a three-module footprint on the DIN rail — common for this class of motor-protective breaker. Clearance requirements: 50 mm above and below, 10 mm to the side, zero forward or backward. At 400 V, the upward clearance must be 160 mm for arc flash containment; at 500 V it's 125 mm, at 690 V it's 100 mm. At 240 V no clearance is required. Plan the gland plate and busbar routing accordingly. Terminals accept 2x (1 to 35 mm²) or 1x (1 to 50 mm²) solid or stranded copper — M6 main contact screws. Mounting position is any, so it works in vertical or horizontal panel layouts without derating.
Operating conditions and ratings
Rated operating voltage range 20 to 690 V. Ambient temperature during operation -20 to +60 °C; storage and transport -50 to +80 °C. Maximum switching frequency at AC-3 and AC-3e duty is 15 operations per hour — adequate for a motor start cycle on a conveyor or pump, not for a high-speed jogging application. No ground fault detection, no phase failure detection built in — this is a straight thermal-magnetic or electronic motor-protective breaker; external monitoring is needed if those functions are required.