21.Z1.C04-1000 KEB
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The KEB 21.Z1.C04-1000 is part of the Z1 Sine Wave EMC Filters series and has a rated power of 45 kW with a rated current of 95 Amps. This three-phase filter features a maximum input voltage of 440 Volts and a rated input voltage of 400 VAC. It has dimensions of 405 mm depth, 412 mm width, and 193 mm height, and weighs 96 kilograms.
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Product Description:
The 21.Z1.C04-1000 is a sine-wave EMC filter manufactured by KEB and supplied within the Z1 Sine Wave EMC Filters series. Designed for three-phase inverter installations, the unit is connected on the motor side of a variable-frequency drive to shape the switching waveform into a near-sinusoidal profile. By reducing differential-mode voltage rise time and limiting electromagnetic interference, the filter safeguards motor insulation, eases bearing stress, and keeps conducted emissions within industrial automation limits.
Electrical ratings dictate where the filter can be installed. The input terminals are specified for 400 VAC mains at a fundamental frequency of 50 Hz, and the windings carry a continuous load of 95 A without derating. Matching to a drive system up to 45 kW guarantees compatibility with mid-range induction or synchronous motors. A conductor cross-section of 50 mm² is required on both line and load sides, providing adequate thermal margin for the copper bars. The laminated iron core and its vacuum-impregnated windings are enclosed in a steel frame that measures 405 mm in depth, 412 mm in width, and 193 mm in height, allowing direct cabinet mounting.
Thermal and mechanical data complete the installation picture. The filter body weighs 96 kg, and its internal windings account for 29.5 kg of that mass, so lifting points or a base plate are usually specified in the control cabinet. During operation across a three-phase network, the design tolerates transient overvoltage up to 440 V at the input terminals while limiting conversion losses to 520 W, heat that must be removed by cabinet ventilation. Because the circuit topology is based on three series LC branches, it maintains the required impedance symmetry among the 3 phases, keeps dv/dt below the motor’s insulation limits, and contributes to overall EMC compliance without imposing additional derating beyond the figures stated above.
