This mains block is fully shielded from radiating electric fields by means of its aluminium chassis. The conductive chassis drains the interference down to ground. It has to be connected to an earthed socket with an earthed mains cable, in order to work properly. For a useful degree of shielding and immunity, the mains block should be with a high quality mains cable.
 

SUPRA NIF Transient Filter

It is equipped with SUPRA NIF (Non-Intrusive Filtering), a mild transient filter which will not influence the transient properties of the equipment. SUPRA NIF is developed by Ben Duncan Research in England.

3-Way Surge Protection

It is equipped with SUPRA’s surge protection device which protects all three ways: Live to Earth, Neutral to Earth and Live to Neutral. Many other surge protectors are only Live to Neutral, and do not protect against field surges by proximate lightning. Lightning is always referred to earth.

Technical Specifications