The rated current of the LeaXield is 50 A at a rated temperature of 50 °C. A short-term overload of 75 A for up to 3 minutes per hour, or 125 A for up to 30 seconds per hour, is permissible.

LeaXield is suitable for use in a 3-wire TN system. It cannot be used in a 2-line system. Types for 4-line systems are available on request. The rated voltage is 305/530V AC (50 Hz). In addition, a minimum voltage of 208/360V AC (50 Hz) is required for operation. Types with higher rated currents are available on request.

The unintentional tripping of a universal RCD (Type B/Type B+) can be prevented with LeaXield. There are two distinct types which differ in their tripping characteristics, i.e. with regard to the tripping threshold dependent on the frequency and the time delay.
It should be noted that, in accordance with EN 50178 / VDE 0160, variable speed drive systems are only permissible if type B/B+ RCDs are used.

The maximum leakage current that can be reduced with the aid of the LeaXield is 1 A (peak value). Care should be taken not to exceed this value. Higher leakage currents can result in malfunctions or destruction of the device. To ensure that the maximum leakage current of 1 A is not exceeded, a leakage current measurement over time is first necessary.

The block diagram shows a typical drive system consisting of EMC filter, inverter and motor. For the analysis, the aggregate current via L1, L2 and L3 shall be measured with a current probe on the line side of the EMC filter. All three phases are to be conducted through the current probe (marked in green in the block diagram). A residual current measuring device should be used for the evaluation. Alternatively, an oscilloscope can also be used.

Important: The residual current must always be measured across all phases and not to ground.

The measurement example below shows the maximum leakage current that flows into the system/machine on the line side. The peak value is about 500 mA and is thus lower than the maximum permissible value of 1 A. In this case it is possible to use the LeaXield.

The analysis of the leakage current over the frequency range provides information on whether the frequencies to be attenuated lie within the operating range of LeaXield, which extends from 150 Hz to about 30 kHz. No significant attenuation is possible in these ranges beyond the operating range of LeaXield. The current probe as described in question 4 is to be used for this measurement. For the analysis, a differential current measuring device can again be used, or also the FFT mode of an oscilloscope.

Please note that the attenuation characteristic of LeaXield is frequency-dependent. As a rule, leakage currents with a frequency of >1 kHz exhibit higher amplitudes than at lower frequencies. Accordingly, the attenuation of LeaXield was also designed to be greater in the range above 1 kHz. The measurement example below shows the frequency spectrum of the leakage current. The frequency components that are problematical for the RCD, in this case 150 Hz and 2 kHz, are within the operating range of the LeaXield (150 Hz – 30 kHz) where the use of LeaXield is possible.