12.F4.C3D-4Q20 KEB
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The KEB 12.F4.C3D-4Q20 is a frequency inverter from the F4 Combivert Frequency Inverters series with a power rating of 4.0 kW and an apparent power of 6.6 kVA. It supports 3-phase 400 V supply, features an IP20 enclosure rating, and has an output current of 9.5 A. The inverter includes a filter and braking transistor accessory set and operates at a rated switching frequency of 12 kHz.
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Product Description:
The 12.F4.C3D-4Q20 is a frequency inverter produced by KEB as part of the F4 Combivert Frequency Inverters series. This unit modulates the voltage and frequency supplied to an AC motor so torque and speed can be matched to process needs, making it a common choice for conveyors, pumps, and fan drives in automated machinery. It is intended for variable-speed motor control in general industrial equipment where stable operation is required.
The inverter presents an apparent power of 6.6 kVA, a figure that represents the product of RMS voltage and current it can handle on the input side without factoring in phase shift. Its housing carries an IP20 rating, meaning finger-safe protection against solid objects but no liquid sealing, which is appropriate for installation inside switchgear cabinets. The drive draws 10.5 A from a three-phase supply, a value that is important for sizing upstream wiring and protective devices. Internally, the IGBT bridge is clocked at a rated switching frequency of 12 kHz, and that pulse rate improves motor current smoothness while increasing thermal stress in the power stage. The unit is designed for a mains voltage of 400 V, aligning with standard European industrial networks.
On the output side, the inverter can deliver a mechanical power of 4.0 kW to the motor while supplying up to 9.5 A of phase current; these limits indicate the largest motor size it can control without derating. Dynamic stops are supported through an external braking resistor that must not be lower than 82 Ω, preventing overcurrent in the braking transistor when decelerating high-inertia loads. Thermal management relies on an aluminum heat sink that may reach 85 °C, and airflow in the panel must keep this surface below that level to preserve rated semiconductor life. Additional parameters such as 130 W of power loss, a 2.5 mm² line cross section, a 20 A mains fuse, a 10 A peak braking current, and 100 m of permissible shielded motor cable help match cabling, protection, and enclosure cooling to the electrical limits of the unit.
