It carries a 15 kW rating at 400 V in AC-2 duty (slip-ring motors, reversing starts) and 18.5 kW at 500 V in AC-3 duty (squirrel-cage motors, direct-on-line starts).
Duty cycles and thermal limits
Switching frequency varies by duty class: 1200 cycles/hour in AC-1 (resistive), 1000 in AC-3, 750 in AC-2, and 250 in AC-4 (plugging/inching). The operating range spans 0.8 to 1.1 times rated voltage at both 50 and 60 Hz.
Built-in auxiliary contacts handle 10 A at 24 V, 6 A at 230 V, and 3 A at 400 V AC. For DC switching: 2 A at 60 V, 1 A at 110 V, 0.3 A at 220 V.
