The 15 kA rating gives headroom for high-fault installations without cascading upstream.
Temperature derating — the real-world current you can count on
The 50 A rating holds at 35 °C ambient. Above that, derate: 48 A at 40 °C, 47 A at 45 °C, 45.95 A at 50 °C, 44.9 A at 55 °C, and 43.8 A at 60 °C. If your panel runs warm — typical for a crowded enclosure — size the downstream load against the derated figure, not the 35 °C number. Operating temperature range is -40 °C to 75 °C, with humidity limits: max 95% up to 55 °C, derating to 55% at 70 °C and 35% at 75 °C.
Lifecycle and sourcing — current production, quoted to order
Compliance documentation covers IEC/EN 60898-1 and IEC/EN 60947-2, plus UL1077. Sealable design allows locking the handle position for lockout/tagout procedures.