21.F4.F1R-4UC0 KEB
Wake Industrial LLC is not an authorized distributor of this product.
The KEB 21.F4.F1R-4UC0 is part of the F4 Combivert Frequency Inverters series and operates with a maximum motor power of 45 kW and an output nominal power of 62 kVA. It features a nominal input current of 100 A, output nominal current of 90 A, and supports a maximum shielded motor line length of 50 meters. The unit is rated for IP20 protection and accommodates up to 95% relative humidity.
Internal Product Review
The 21.F4.F1R-4UC0 is a KEB F4 Combivert frequency inverter for demanding three-phase drive applications. A 45 kW motor rating paired with 90 A nominal output current supports confident control under sustained industrial loading. IP20 protection and an internal brake transistor make the inverter a strong choice for panel-based motion systems.
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Product Description:
The 21.F4.F1R-4UC0 is a three-phase frequency inverter produced by KEB as part of the F4 Combivert Frequency Inverters series. Installed between the mains supply and an AC motor, it converts fixed line voltage into a variable output that lets machinery match speed and torque to the task. By managing motor energy in real time, the unit supports conveyor drives, pumps, and other factory equipment where adjustable control is required.
The power terminals accept conductors up to 50 mm², a cross-section that keeps temperature rise and voltage drop within limits at the rated load. A branch fuse of up to 160 A may be fitted to isolate the inverter during external faults. On the motor side, the drive supports continuous mechanical output of 45 kW, allowing mid-range pumps or compressors to be served without oversizing. For short acceleration bursts it can deliver up to 135 A, supplying additional torque to overcome inertial peaks. During normal operation the supply draws about 100 A, a value used when calculating heat dissipation and conductor sizing inside the cabinet.
An over-current trip engages at 162 A to prevent semiconductor damage, while steady-state motor current is limited to 90 A to fit the thermal capacity of the output stage. At full load the inverter supplies 62 kVA of apparent power across its three phases, matching the voltage-current product that the connected 45 kW motor requires. The housing carries an IP20 rating, so it must be mounted in a closed enclosure yet tolerates ambient humidity up to 95% without condensation. A shielded motor cable up to 50 m can be used to minimize electromagnetic emission, and the built-in brake transistor absorbs regenerative energy during rapid stops, removing the need for an external chopper resistor.
