12.F4.S3D-3420 KEB
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The KEB 12.F4.S3D-3420 is part of the F4 Combivert Frequency Inverters series and is housed in a D type enclosure. This inverter operates on a 3-phase AC input with a 400 V-class supply and features a standard control type. It offers a maximum rated motor power of 4 kW, a nominal input current of 10.5 A, and an output nominal power of 6.6 kVA. Additional features include an accessory filter and braking transistor, IP20 protective system, and a maximum mains fuse rating of 20 A.
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Product Description:
The 12.F4.S3D-3420 is a variable-frequency inverter manufactured by KEB within the F4 Combivert Frequency Inverters series. The unit is intended for cabinet installation where it converts fixed line power into a modulated output that allows production machinery to run motors at controlled speeds and torques. By adjusting frequency and voltage, it provides energy-efficient regulation for conveyors, pumps, and similar processes in industrial automation.
Incoming power must match the 400 V class supply category and arrive as three-phase AC. Internally, the standard control platform chops this input at a carrier frequency of 4 kHz, producing a sinusoidal waveform for the motor. The converter draws a nominal line current of 10.5 A, so upstream wiring with a 2.5 mm² cross section and a maximum mains fuse of 20 A satisfies protection requirements. When loaded to its rated limit, it can drive motors up to 4 kW, and the unit includes an integrated filter as well as a braking transistor for rapid deceleration. Housing type D fits IP20 enclosures, and a shielded motor lead may be routed as far as 100 m without exceeding the drive's EMC limits.
On the output side, the inverter delivers 17.1 A for short bursts, while its continuous current capability is 9.5 A. These values correspond to an apparent power capacity of 6.6 kVA, providing headroom for transient torque demands before the overcurrent trip point of 20.9 A is reached. The protective algorithm measures instantaneous phase current and disconnects the bridge once that threshold is reached to safeguard semiconductor devices. Because heat rise accelerates during peak operation, the short-time ratings are time-limited and sustained duty must stay within the nominal operating range. Coordinating the motor thermal class with the drive's output profile helps reduce insulation stress during extended operation.
