Electronic vacuum ceramic of vacuum interrupter
  Diameter of ceramic:

     φ58.5,φ62,φ67,φ75,φ80,φ82,φ87,φ88,φ90,φ96,φ98,

     φ100,φ101,φ107,φ108,φ115,φ121,φ125,φ128,

     φ140,φ140.5,φ152,φ152.4,φ157.6,φ178,φ181,

     φ185,φ198,φ200,φ203,φ206,φ207,φ210,

     φ230,φ252