Until now, reliably powering a fieldbus node was the sole function of both WAGO’s field-side power supply filters and WAGO’s power supply filters. However, two new variants now offer integrated ground fault diagnostics as well. These models not only protect the system against high-energy disturbances on DC supply lines, such as those caused by switching overvoltages or inductive loads – they also protect the field supply against transient overvoltages.