The Siemens SIRIUS 3RV2332-4XC10 is a circuit breaker designed specifically for starter combinations — meaning it's built to sit ahead of a contactor in a motor branch circuit, combining overload and short-circuit protection in one unit. It's a current-production part (lifecycle stage marked current), so this isn't a scavenger hunt for NOS; it's still rolling off the line. Rated at 59 A at 480 V and 59 A at 600 V, it handles the full-load current of a 40 hp motor at 460/480 V or a 50 hp motor at 575/600 V. The breaking capacity at 400 V is 50 kA — that's the fault current it can safely interrupt without welding contacts or venting plasma. For a panel fed from a transformer with a stiff secondary, 50 kA covers most industrial service entrances.
Mounts via screw or snap-on onto 35 mm DIN rail per DIN EN 60715. Footprint is 55 mm wide, 140 mm tall, 149 mm deep. Clearance: 50 mm above and below, 10 mm to the side, zero forward or backward.