The application last mentioned is of benefit to another property only found in this design:
in the case of an arrester overload, it is certain that with this construction a housing
breakage will never occur; not even any of the inner parts will be ejected. The tube will
remain almost completely intact, and as a result it offers the best possible safety for the
whole switchgear in a substation (see also the section on designing arresters).
The higher costs of the composite hollow core insulator of such a design, in comparison
to porcelain insulators, has long been an obstacle to its being further distributed. As
distribution of composite hollow core insulators increases, along with the corresponding
market supply, a resulting acceptance of the technology is likely to change the situation
in favor of this technology. Anyway, in certain applications, independent of the costs,
this design is virtually without alternatives.