The Siemens 3RV2411-1CA10 is a SIRIUS circuit breaker specifically designed for transformer protection, not general motor branch. That distinction matters for coordination: the trip curve is shaped to handle transformer inrush without nuisance tripping, while still providing short-circuit and overload protection for the transformer and its secondary-side conductors. Rated at 25 A for gL/gG fuse-links at 400 V and 500 V, and 20 A at 690 V, it covers the common low-voltage distribution voltages. The interrupting capacity at 400 V is 100 kA — that is a high-fault-level rating, meaning it can be used on strong utility feeds without needing an upstream current-limiting device.
Terminals are screw-type for the main current circuit, accepting 2×(0.75–2.5 mm²) solid or stranded, or 2×4 mm². The M3 main contact screws are standard for this class.
Key ratings in context
Short-circuit breaking capacity varies by voltage: 100 kA at 240 V, 400 V, and 500 V; 10 kA at 690 V. No ground fault detection on this variant. The 15 operations per hour maximum at AC-3 duty applies to switching under load.