IP54 protected VLT^® drives can now be matched by IP54 protected dU/dt filters. Costly cabinets can thereby be spared for installations onboard ships or in the chemical industry e.g. The filters are all based on the IP00 version covering the same voltage range and same current sizes. The electrical performance is similar to the existing range with a reduction of the dU/dt to approximately 500 V /μsec.

Very steep wave front transients in power networks characterized by high dU/dt values pose significant risks as they can destroy motors, transformers, and other electrical equipment due to Highly non-uniform initial potential distribution Internal resonant phenomena resulting in local amplification of voltage. Overstressing the insulation system reduces significantly the equipment lifetime and often leads to an internal short-circuit.