Product Description:

The 12.F4.C1E-4L20 is a frequency inverter produced by KEB in the F4 Combivert Frequency Inverters series. Designed for cabinet installation, it converts fixed utility power into a variable voltage and frequency output that regulates the speed of three-phase motors in automated process equipment, material-handling lines, and HVAC drives. By integrating IGBT switching, current monitoring, and a simple control interface, the unit serves as a compact command element between the mains and the application motor.

Its power stage is protected to IP20, so live parts must remain inside an enclosure during operation. The inverter connects to a three-phase network at 400 V AC and uses conductors up to 2.5 mm², drawing a nominal input of 10.5 A while delivering an output current of 9.5 A. That current supports motors up to 4 kW, translating to an apparent output of 6.6 kVA. A 20 A mains fuse matches the specified short-circuit withstand, and the integrated brake transistor directs surplus energy into an external resistor when the machine decelerates. For safe braking, the minimum resistor value is 50 Ω, while 150 Ω is typical for moderate stop profiles. A shielded motor cable may extend to 100 m without exceeding the inverter’s output filters.

During transient demands the drive tolerates bursts up to 17.1 A, and an over-current trip activates at 20.9 A to protect the semiconductor bridge. Thermal monitoring intervenes before the heat-sink reaches 73 °C, maintaining reliability under dense panel layouts. Because the brake transistor is integrated, designers only need to select a resistor within the documented range, and wiring remains straightforward through screw terminals sized for the 2.5 mm² conductors. The three input phases are balanced internally, so supply symmetry is maintained, and the 100 m shielded cable limit prevents excessive capacitive loading between the inverter and the motor.