21.Z2.F04-1003 KEB
Wake Industrial LLC is not an authorized distributor of this product.
The KEB 21.Z2.F04-1003 is a motor choke from the Z2 Three Phase Motor Chokes series. It supports a rated voltage of 400 VAC and a rated current of 90 amps, with a maximum voltage of 550 volts and an inductance of 0.102 millihenry. The device weighs 17.3 kilograms, has a copper weight of 5.8 kilograms, and features a conductor cross-section of 35 mm².
Internal Product Review
The 21.Z2.F04-1003 is a KEB Z2 three-phase motor choke designed for dependable drive-side filtering at 400 VAC and 90 A. A 0.102 mH inductance and 20% Uk support effective current smoothing and stable motor protection, making the unit a strong choice for industrial power conditioning.
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Product Description:
The 21.Z2.F04-1003 is a three-phase motor choke manufactured by KEB for the Z2 Three Phase Motor Chokes series. Installed on the output of a pulse-width modulation drive, it provides an inductive barrier that limits current ripple, attenuates common-mode noise, and reduces stress on motor insulation in automated production lines. The component serves as a passive protection element that can improve motor life and minimize electromagnetic interference within cabinet-mounted variable-speed systems. Its filtering action is particularly useful when long motor cables or rapid drive-switching transitions increase electrical noise at the motor terminals.
The choke is rated for a line voltage of 400 VAC, so its insulation system is suitable for common European and North American mains supplies connected through adjustable-speed drives. A continuous current limit of 90 A per phase indicates the thermal load that the winding copper and core can withstand without excessive temperature rise. The coil has an inductance of 0.102 mH, which reduces voltage rise rates and moderates peak charging currents flowing into the motor’s stray capacitance. The 20% Uk impedance factor represents the intentional voltage drop at the rated load, providing effective filtering while keeping conduction losses manageable. During occasional overvoltage events, the assembly can tolerate phase potentials of up to 550 V without dielectric failure.
Each phase is wound with conductors that have a cross-sectional area of 35 mm², and the choke has a continuous power dissipation of 147 W. The laminated iron stack and heavy copper give the device a total mass of 17.3 kg, so the mounting surface and fasteners must provide adequate mechanical support. The choke contains three identical coils arranged in a compact stack for balanced operation across all phases. The enclosure occupies 335 mm in width, 275 mm in depth, and 180 mm in height, leaving space for contactors and fuses in standard control cabinets. Adequate clearance around the assembly allows heat from the windings and magnetic core to disperse during continuous operation.
