63 A B-curve MCB for railway and industrial panels
The part is designed for railway applications per the manufacturer's designation, and it is rated for overvoltage category III with pollution degree 3 — meaning it is suitable for fixed installations inside enclosures where transient overvoltages from the supply are present and the environment may have conductive dust or condensation. The IP20 rating applies with conductors connected, so the terminals themselves are finger-safe but the unit requires enclosure protection against moisture.
Temperature derating and mounting
The 63 A rating holds at 35 °C ambient. Above that, the continuous current must be derated: 59.16 A at 40 °C, 57.14 A at 45 °C, 55.06 A at 50 °C, 52.92 A at 55 °C, and 50.65 A at 60 °C. The fastening method is the quick-assembly system — it snaps onto the rail and can be removed with a screwdriver without disturbing adjacent units.