25.Z1.C04-1000 KEB
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The KEB 25.Z1.C04-1000 is part of the Z1 Sine Wave EMC Filters series and has a rated power of 110 kW and a rated current of 221 Amps. This filter features a protection rating of IP20 and a connection cross-section of 150 mm². The unit weighs 244 kilograms and supports a maximum cable length of 5 meters.
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Product Description:
The 25.Z1.C04-1000 is a sine wave EMC filter produced by KEB and supplied within the Z1 Sine Wave EMC Filters series. This passive line component is installed between an inverter and an asynchronous or synchronous motor to convert the drive’s PWM output into a near-sinusoidal waveform, limit common-mode noise, and protect motor insulation in automated machinery. It supports low-voltage distribution systems typical in factory lines and helps reduce dv/dt stress, so cabling and bearings experience less electrical discharge.
The filter is designed for a three-phase supply of 400 V, a level that matches standard low-voltage industrial grids and allows direct coupling to variable-frequency drives. At this voltage, it carries 110 kW continuously, giving headroom for motors near 150 hp. The conductor path is rated for 221 A RMS, so copper temperature rise stays within IEC limits at full load. During heavy starts, the assembly tolerates 150% for 60 s every 10 min, and this margin covers motor inrush. An IP20 enclosure guards against finger contact while still allowing cabinet airflow to pass.
To manage resistive heating, the iron-core network produces a total loss of 1145 W, and adequate airflow or a heat sink is required to maintain the internal temperature allowed by the 3K3 climatic category. The frame mass of 244.0 kg dampens vibration and stores thermal energy, delaying temperature peaks during the overload window described above. Power conductors use lugs sized for a 150 mm² cross-section, while the protective earth fastens to an M10 stud to keep fault impedance low. When drive cables extend beyond the recommended 5 m limit, additional dv/dt measures are required. An NC thermal contact closes if core temperature rises excessively, allowing that signal to be wired into the cabinet protection circuit.
