Phoenix Contact 1411520 The Heavycon Advance protective cover is a type of panel mountable enclosure that provides enhanced protection against environmental factors. It features an IP66 rating, indicating it can withstand both dust and water immersion. The cover also has a B24 protective feature and includes a screw locking system for secure attachment to the panel side. A retaining cord with a 3 mm diameter eyelet allows for easy adjustment and tightening of the cover in place.