Ratings and What They Mean for Fit
The B characteristic means the magnetic trip operates at 3–5× In, so it's a good match for resistive or general-purpose loads, not high-inrush motor or transformer circuits. The 50 A rating at 35 °C is the base value; at 40 °C it derates to 47.6 A, at 50 °C to 45.1 A, and at 60 °C to 42.4 A. If your panel ambient runs above 35 °C, size the load accordingly. Breaking capacity is 10 kA per EN 60898 for AC, and 10 kA per EN 60898-2 for DC at the rated DC voltage of 220 V. The part is rated for universal current (AC/DC), so it can be used in both AC and DC circuits, but DC polarity must be observed per the manufacturer's note. Pollution degree 3 and overvoltage category III mean it's suited for fixed installations in industrial environments where transient overvoltages are common. Energy limitation class 3 indicates a moderate let-through energy, which is typical for a 50 A B-curve MCB.