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dV/dt Filters

dV/dt filters provide a slower voltage rise rate on the motor terminal phase-to-phase voltage, which is particularly important when using shorter motor cables. The higher the level of inductance, the higher the voltage peaks, which can cause flashover, a condition that results in premature breakdown of the winding insulation of the connected motor.
Even in applications where motor cable length is substantial, dV/dt filters reduce the peak voltage, prolonging the life of the motor. They accomplish this by cutting off frequencies above the switching frequency. With small inductance and capacitance, dV/dt filters are a more cost-conscious solution than (but not a substitute for) sine wave filters.

• Greater motor longevity through lower dV/dt stress
• Reduced transmission of electromagnetic interference to surrounding cables and equipment
• Trouble-free operation