De lontbehuizing is makke fan 95% AL203 hege-sterkte porseleinen buizen. Heechsuvere kwartsân en 99,99% suvere sulveren/koperen platen binne fersegele en stevich laske yn 'e buis. It kontaktflak is sulverplated.
| Model | Sikringgrutte (mm) | Poalen | Nominale spanning (V) | Nominale stroom (A) |
| RT18-32 DC-basis | 10X38 | 1/2/3/4 | DC1000V | 32 |
| CJPV-32L | 10X85 | 1 | DC1500V | 32 |