Керамические ограничители напряжения.

line-to-ground applications?

В предложении:

Specified values only apply to ceramic transient voltage suppressors (CTVS) components that have not beeen subject to prior electrical, mechanical or thermal damage. The use of CTVS devices in LINE-GROUND APPLICATIONS is therefore not advisable, and it is on;y allowed together with safety countermeasures like thermal fuses.

заземление?

Спасибо)))