This is an insulation accessory for Compact NSX 400/630 or EasyPact CVS 400/630. These interphase barriers reinforce insulation level at the power connection points. They are mandatory for voltages above 500 VAC for both fixed devices and adapters on plug in base. Interphase barriers are clipped easily between front or rear connection terminals. They are not compatible with terminal shields. It is a set of 6 parts.