Product Description:

The 8I74T400750.010-1 is a three-phase inverter module produced by B&R Automation for the 8I7 ACOPOS Inverters series. It converts fixed mains power into regulated AC for variable-speed motor control in production lines, packaging machines, and material-handling cells. Pulse-width-modulated switching with current feedback ties servo or induction motors to centralized motion controllers and forms the interface between plant power distribution and axis commands.

At the input terminals, the inverter draws up to 26.5 A from a 380 VAC supply, while the apparent power reaches 16.2 kVA when it is fed from 500 VAC. Internally, insulated-gate bipolar transistors switch at a nominal carrier frequency of 4 kHz, shaping a sinusoidal output that can deliver a continuous 17 A to the motor. The power stage is rated for motors up to 7.5 kW, enabling medium-sized pumps, conveyors, and extruders to be started and regulated from a compact footprint. All electronics are housed in an enclosure with an IP20 protection rating, which is suitable for installation inside a ventilated control cabinet where accidental finger contact is prevented. Power dissipation during normal operation is 263 W, so cabinet ventilation must accommodate this thermal load.

The unit’s mechanical profile of 150 mm width, 308 mm height, and 232 mm depth allows stacking with neighboring modules on DIN rail spacers without blocking airflow. During power-up, the capacitors charge through an inrush limiter, yet the peak still rises to 27.6 A, so feeder breakers must handle that short demand. Once energized on a three-phase network at 500 VAC, steady-state input drops to 18.7 A; overload events are covered by transient limits of 28 A for 2 s and 25.5 A for 60 s. Dynamic braking energy is routed to an external resistor no smaller than 27 Ω, protecting the DC link when the connected motor decelerates quickly.