The 15 kA breaking capacity per EN 60898 covers most commercial and light industrial panels; the 20 kA rating per IEC 60947-2 gives headroom for higher-fault installations where the prospective short-circuit current exceeds 15 kA. The 400 V AC rating (50/60 Hz) suits three-phase distribution in 400/230 V networks across Europe and other 50/60 Hz regions.
Thermal derating and ambient conditions
The 50 A rating holds at 35 °C. At 45 °C it derates to 47 A, at 50 °C to 45.95 A, at 55 °C to 44.9 A, and at 60 °C to 43.8 A. The operating range spans -40 °C to 75 °C, with humidity limits of 95 % up to 55 °C, 55 % up to 70 °C, and 35 % up to 75 °C.
The 5SY7450-6 snaps onto a DIN rail via the quick-assembly system — 4 modular width units (72 mm wide, 90 mm tall, 76 mm deep, 70 mm installation depth). Mounting position is any. Sealable — can be locked in the OFF position for lockout/tagout.