The Siemens 5SY5232-7CC12 is a 2-pole miniature circuit breaker from the 5SY5 series, rated C32 with a 440V DC breaking capacity of 10kA. This is a DC-rated MCB, so it's built for string monitoring in photovoltaic arrays, DC bus protection in drives, or battery-bank branch circuits — places where a standard AC MCB won't reliably extinguish the DC arc. The C32 curve means it holds 32 A continuous and trips magnetically between 5x and 10x rated current (160–320 A), sized for motor or transformer inrush without nuisance trips on a 32 A DC circuit.
The 440V DC rating is the key spec — this isn't a general-purpose AC/DC breaker. DC arcs don't have a natural zero-crossing, so the arc chamber and contact gap are designed for DC interruption. The 10kA breaking capacity at 440V DC means it can safely clear a fault up to 10,000 A on a 440V DC bus without welding contacts or rupturing the case. The 2-pole configuration lets you break both the positive and negative conductors in a DC circuit, which is standard practice for ungrounded DC systems.