Braking resistor, for ATV930D55N4, ATV950D55N4, ATV950D55N4E drives. Reference values for an average braking cycle. Power VA 3.8 kW, protection class IP23, resistance 8 ? at 20 °C. Supply voltage 200-240 V or 380-480 V 50/60 Hz. Load factor for resistors The value of the average power that can be dissipated from the resistor into the housing at 50 °C. Determined for a load factor during braking that corresponds to the majority of common applications. Standard overload 4 s braking at a braking torque of 1.35 Tn for a cycle of 40 s. High overload 4 s braking at a braking torque of 1.65 Tn for a cycle of 40 s. Required number per drive 1.