In addition, various pilot lights, lightning arrestors, phase protectors and intrinsically safe relays are available as modifications. 此外，作為改型件，還可提供各種指示燈，避雷器，相位保護器和安全火花繼電器。
A new viewpoint on the selection of the specific creepage distance is put forward and the merits and disadvantages of the line lightning arrester are analyzed. 作者還對避雷器爬電比距的選擇提出新的觀(guān)點(diǎn)，分析了線(xiàn)路避雷器具備的優(yōu)缺點(diǎn)。
